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Superior Toughened Biodegradable Poly(L-lactic acid)-based Blends with Enhanced Melt Strength and Excellent Low-temperature Toughness via In situ Reaction Compatibilization

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Chinese Journal of Polymer Science 2023年第3期41卷 373-385,I0007页

作者： Shi-Ling Jia Xiang-Yu Wang Ye zhang Xiang-Yu Yan Hong-Wei Pan Yan Zhao Li-Jing Han hui-liang zhang Li-Song Dong hui-Xuan zhang Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Materials Science and Engineering Changchun University of TechnologyChangchun 130012China

The toughened poly(L-lactic acid)/poly(butylene succinate-butylene terephthalate)(PLLA/PBST) blend with enhanced melt strength and excellent low temperature toughness and strength was prepared by melt compounding through in situ compatibilization reaction in presence of multifunctional epoxy compound(ADR).The PLLA/PBST blend was an immiscible system,and the compatibility of the PLLA/PBST blend was improved after adding *** and GPC curves confirmed the formation of the PLLA-g-PBST copolymer,which improved the interfacial bonding of the blend and therefore the PLLA/PBST/ADR blend showed excellent melt strength and mechanical *** the PLLA/PBST/ADR blend with 70/30 PLLA/PBST content,the complex viscosity increased significantly with increasing ADR ***,the tensile strength,elongation at break and impact strength all increased obviously with increasing the ADR *** elongation at break of the blend reached the maximum value of 392.7%,which was 93.2 times that of neat *** the impact strength of the blend reached the maximum value of 74.7 k J/m~2,which was 21.3 times that of neat ***,the PLLA/PBST/ADR blend exhibited excellent lowtemperature toughness and *** –20 ℃,the elongation at break of the PLLA/PBST/ADR blend was as high as 93.2%,and the impact strength reached 18.8 k J/m~***,the tensile strength of the blend at low temperature was also high(64.7 MPa),which was beneficial to the application of PLA in the low temperature *** addition,the PLLA/PBST/ADR blend maintaind good biodegradability,which was of great significance to the wide application of PLLA.

关键词： Poly(L-lactic acid) PBST Compatibilization Super toughness Low-temperature mechanical properties Biodegradability

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Application of narrative nursing in the families of children with biliary atresia:A retrospective study

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World Journal of Clinical Cases 2021年第34期9卷 10557-10565页

作者： liang-hui zhang Hong-Yan Meng Ren Wang You-Cheng zhang Jian Sun Department of Children Surgery Huai’an Maternal and Child HospitalHuai’an 223001Jiangsu ProvinceChina

BACKGROUND Narrative nursing is an important clinical nursing intervention *** is the practice of patient storytelling to share the essence of *** current clinical intervention for biliary atresia(BA)mainly focuses on disease treatment and does not pay enough attention to the psychological state of family *** To explore the application value of narrative nursing in the families of children with *** Sixty-four family members of children with BA in our hospital from December 2017 to October 2020 were retrospectively included and were divided into a study group(n=32)and a control group(n=32).The control group was provided with routine nursing,while the study group was given narrative nursing on the basis of the control *** scores of mood state(depression and anxiety),family members’nursing ability,perceived stress,and nursing job satisfaction of the children’s families were calculated before and after the *** Before intervention,there was no significant difference in the self-rating anxiety scale and self-rating depression scale scores between groups(P>0.05).After intervention,the self-rating anxiety scale and self-rating depression scale scores in the study group were lower than those in the control group(both P=0.000).Before intervention,the study group adjusted life to meet care needs,evaluated family members and social resources,dealt with personal emotions,responded to needs,and provided assistance,and the adaptive care role scores were not significantly different from those in the control group(P=0.802,0.819,0.694,0.796,and 0.686,respectively).After intervention,all scores were significantly lower in the study group than in the control group(all P<0.0001).Before intervention,there was no significant difference in the child post-traumatic stress disorder symptom score(CPSS)score between groups(P=0.615).After intervention,the CPSS scores were significantly lower than those before intervention in both groups and low

关键词： Narrative nursing Biliary atresia Negative emotions Nursing ability Retrospective study Perceptual pressure

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Studies on Rheological, Thermal, and Mechanical Properties of Polylactide/Methyl Methacrylate-Butadiene-Styrene Copolymer/Poly(propylene carbonate) Polyurethane Ternary Blends

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Chinese Journal of Polymer Science 2019年第12期37卷 1273-1282,I0007页

作者： Ji-Li Zhao Hong-Wei Pan hui-Li Yang Jun-Jia Bian hui-liang zhang Ge Gao Li-Song Dong College of Chemistry Jilin UniversityChangchun 130012China Department of Science Beihua UniversityJilin 132013China Key Laboratory of Polymer Ecomaterials Chinese Academy of SciencesChangchun Institute of Applied ChemistryChangchun 130022China Zhejiang Zhongke Applied Chemistry Technology Co. Ltd.Hangzhou 310000China

Polylactide(PLA),methyl methacrylate-butadiene-styrene copolymer(MBS),and poly(propylene carbonate)polyurethane(PPCU)were blended and subjected to blown film *** rheological,mechanical,morphological,thermal,and crystalline properties of the PLA/MBS/PPCU ternary blends and the mechanical properties of the resulting films were *** of mechanical test showed that PPCU and MBS could synergistically toughen *** impact strength of 50/10/40 PLA/MBS/PPCU blend(74.7 k J/m^2)was about 7.5 times higher than that of the neat PLA(10.8 k J/m^2),and the elongation at break of 50/10/40 PLA/MBS/PPCU blend(276.5%)was higher by about 45 times that of PLA(6.2%).The tear strength of PLA/MBS/PPCU films was 20 k N/m higher than that of PLA,and the elongation at break(MD/TD)of 50/10/40 PLA/MBS/PPCU films was 271.1%/222.3%,whereas that of PLA was only 2.7%/3.0%.POM observations displayed that the density of spherulite nucleation increased and the size of crystalline particles decreased with the addition of *** increasing PPCU content from 5%to 20%,the density of spherulite nucleation increased and the size of crystalline particles decreased continuously,but the nucleation density of spherulites was slightly lowered with increasing PPCU content from 30%to 40%.The PLA/MBS/PPCU films exhibited excellent mechanical properties,which expanded the application range of these biodegradable films.

关键词： Biodegradable Polylactide Poly(propylene carbonate)polyurethane Methyl methacrylate-butadiene-styrene copolymer Films

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MISCIBILITY,CRYSTALLIZATION AND MECHANICAL PROPERTIES OF PPC/PBS BLENDS

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Chinese Journal of Polymer Science 2007年第6期25卷 589-597页

作者： hui-liang zhang Xiao-hong Sun Qing-yong Chen Min-qiao Ren Zhi-hao zhang Hong-fang zhang Zhi-shen Mo State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Graduate School of Chinese Academy of Science Changchun 130022 China

In this paper, melt blends of poly（propylene carbonate）（PPC） with poly（butylene succinate）（PBS） were characterized by dynamic mechanical analysis （DMA）, differential scanning calorimetry （DSC）, tensile testing, wide-angle X-ray diffraction （WAXD）, polarized optical microscopy and thermogravimetric analysis （TGA）. The results indicated that the glass transition temperature of PPC in the 90/10 PPC/PBS blend was decreased by about 11 K comparing with that of pure PPC. The presence of 10% PBS was partially miscible with PPC. The 90/10 PPC/PBS blend had better impact and tensile strength than those of the other PPC/PBS blends. The glass transition temperature of PPC in the 80/20, 70/30, and 60/40 PPC/PBS blends was improved by about 4.9 K, 4.2 K, and 13 K comparing with that of pure PPC, respectively; which indicated the immiscibility between PPC and PBS. The DSC results indicated that the crystallization of PBS became more difficult when the PPC content increased. The matrix of PPC hindered the crystallization process of PBS. While the content of PBS was above 20%, significant crystallization-induced phase separation was observed by polarized optical microscopy. It was found from the WAXD analysis that the crystal structure of PBS did not change, and the degree of crystallinity increased with increasing PBS content in the PPC/PBS blends.

关键词： Poly(propylene carbonate) Poly(butylene succinate) Miscibility Crystallization Mechanical properties.

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Microstructure and superconducting properties of (BaTiO3,Y2O3)-doped YBCO films under different firing temperatures

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Rare Metals 2017年第1期36卷 37-41页

作者： Hong-Yan Wang Fa-Zhu Ding Hong-Wei Gu hui-liang zhang Ze-Bin Dong University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Applied Superconductivity Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190 China

YBaCuO(YBCO) films with co-doping of Ba Ti O(BTO) and YOnanostructures were successfully fabricated on La Al O(LAO) substrate by metal organic deposition using trifluoroacetates(TFA-MOD). The focus of this study was to optimize the process conditions during the firing heat treatment of high critical current density(J C)-co-doped YBCO films. The effect of the firing temperatures on both the surface morphology and the superconducting properties for the doped YBCO films was systematically studied. According to the X-ray diffraction(XRD) and scanning electron microscopy(SEM) results,the films prepared at 820 and 850 °C show poor electrical performance due to impurity phases and large pores. In contrast, the dense YBCO films prepared at 830 and840 °C with the critical current densities of 10 MA-cm(77 K, 0 T) are obtained.

关键词： YBa2Cu3O7-x BaTiO3 and Y2O3 nanostructures Firing temperature TFA-MOD

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Biodegradable Poly(butylene adipate-co-terephthalate)/Poly(glycolic acid) Films: Effect of Poly(glycolic acid) Crystal on Mechanical and Barrier Properties

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Chinese Journal of Polymer Science 2023年第7期41卷 1123-1132页

作者： Hong-Wei Pan Ye Wang Shi-Ling Jia Yan Zhao Jun-Jia Bian hui-Li Yang Yan-Ping Hao Li-Jing Han hui-liang zhang Key Laboratory of Polymer Ecomaterials Chinese Academy of SciencesChangchun Institute of Applied ChemistryChangchun130022China School of Pharmaceutical Sciences Changchun University of Chinese MedicineChangchun130117China Changchun University of Technology Changchun130012China Shandong Dawn Polymer Co. Ltd.Longkou265700China

Binary biodegradable polymers films, poly(butylene adipate-co-terephthalate)(PBAT) and poly(glycolic acid)(PGA), were prepared through batch melt mixing to obtain Film Ⅰ and Film Ⅱ under two different processing conditions. PGA crystals played a major role in enhancing the mechanical and barrier properties of the films. For Film Ⅰ, there were initial PGA crystals before the film blowing process, the PGA molecular chain further crystallized, forming the oriented crystallization of PGA. Moreover, the Xcand crystalline size in Film Ⅰ were higher than those in Film Ⅱ. Compared with the different processing methods, Film Ⅰ has excellent mechanical and oxygen barrier properties due to the crystallization and orientation. The tensile strength reached 45.0 MPa, and tear strength exceeded 138.2 kN/m, while the elongation at break was as high as 750% for PBAT/PGA 85/15 in Film Ⅰ. The WVTR, WVP coefficients, and OP coefficients of PBAT/PGA films were decreased obviously with increasing the PGA content both in Film Ⅰ and Film Ⅱ. Moreover, the barrier properties of oxygen in Film Ⅰ were better than that in Film Ⅱ. This work reveals a feasible processing technique by introducing of initial crystallization of PGA to blow PBAT/PGA films with excellent mechanical and barrier properties.

关键词： Poly(butylene adipate-co-terephthalate) Poly(glycolic acid)(PGA) Biodegradable polymers Films

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Biodegradable Foaming Material of Poly(butylene adipate-co-terephthalate)(PBAT)/Poly(propylene carbonate)(PPC)

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Chinese Journal of Polymer Science 2022年第2期40卷 208-219页

作者： Han-Lin Tian Ze-Peng Wang Shi-Ling Jia Hong-Wei Pan Li-Jing Han Jun-Jia Bian Ying Li hui-Li Yang hui-liang zhang Changchun University of Technology School of Chemical EngineeringChangchun 130012China Key Laboratory of Polymer Ecomaterials Chinese Academy of SciencesChangchun Institute of Applied ChemistryChangchun 130022China Jilin COFCO Biochemistry Packaging Co. Ltd.Liaoyuan 136300China

A biodegradable blend foaming material of poly(butylene adipate-co-terephthalate)(PBAT)/poly(propylene carbonate)(PPC)was successfully prepared by chemical foaming agent and screw extrusion ***,PBAT was modified by bis(tert-butyl dioxy isopropyl)benzene(BIBP)for chain extension,and then the extended PBAT(E-PBAT)was foamed with PPC using a twin(single)screw *** analyzing the properties of the blends,we found that Young’s modulus increased from 58.8 MPa of E-PBAT to 244.7 MPa of E-PBAT/PPC 50/*** viscosity of the polymer has a critical influence on the formation of *** with neat PBAT(N-PBAT),the viscosity of E-PBAT increased by 3396 Pa·s and E-PBAT/PPC 50/50 increased by 8836 Pa·***,the dynamic mechanical analysis(DMA)results showed that the storage modulus(E’)at room temperature increased from 538 MPa to 1650 *** various phase morphologies(“sea-island”,“quasi-co-continuous”and“cocontinuous”)and crystallinity of the blends affected the spread velocity of gas and further affected the foaming morphology in E-PBAT/PPC ***,through the analysis of phase morphology and foaming mechanism,we concluded that the E-PBAT/PPC 70/30 component has both excellent strength and the best foaming performance.

关键词： Poly(butylene adipate-co-terephthalate) Poly(propylene carbonate) Phase structure Biodegradable foam Extrusion foaming

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Protein Phosphatase 2A as a Drug Target in the Treatment of Cancer and Alzheimer's Disease

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Current Medical Science 2020年第1期40卷 1-8页

作者： hui WEI hui-liang zhang Jia-zhao XIE Dong-li MENG Xiao-chuan WANG Dan KEI Ji ZENG Rong LIU Department of Pathophysiology Key Laboratory of Ministry of Education for Neurological DisordersSchool of Basic MedicineTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Department of Clinic Laboratory Wuhan Fourth HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China

Protein phosphatase 2A(PP2A)is a major serine/threonine phosphatase which participates in the regulation of multiple cellular *** a confirmed tumor suppressor,PP2A activity is downregulated in tumors and its re-activation can induce apoptosis of cancer *** the brains of Alzheimer's disease(AD)patients,decreased PP2A activity also plays a key role in promoting tau hyperphosphorylation and A0 *** this review,we discussed compounds aiming at modulating PP2A activity in the treatment of cancer or *** upstream factors that inactivate PP2A in diseases have not been fully elucidated and further studies are *** will help for the refinement and development of novel and clinically tractable PP2A-targeted compounds or therapies for the treatment of tumor and AD.

关键词： protein phosphatase 2A compounds tumor Alzheimer's disease

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Mechanical Properties, Crystallization and Biodegradation Behavior of the Polylactide/Poly(3-hydroxybutyrate-co-4-hydroxybutyrate)/ Poly(butylene adipate-co-terephthalate) Blown Films

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Chinese Journal of Polymer Science 2020年第10期38卷 1072-1081,I0005页

作者： Xiang-Yu Wang Hong-Wei Pan Shi-Ling Jia Zeng-Wen Cao Li-Jing Han hui-liang zhang Li-Song Dong Key Laboratory ofPolymer Ecomaterials Chinese Acadermy of SciencesChangchun Istitute of Applied ChemistryChangchun 130022 China University of Science and Technology of China Hefei 230026 China Zhejiang Zhongke Applied Chemistry Technology Co LtdHangzhou 30000 China

Polactide(PLA),poly(3-hydroxybutyrate-co-4-hydroxybutyrate)(P(3HB-CO-4HB)),and poly(butylene adipate co-terephthalate)(PBAT)ternary blends were prepared by extrusion *** biodegradable PLA/P(3HB-co 4HB)/PBAT films were successfully obtained by using blown films *** siffness-toughness balance was achieved for 55/10/35 PLA/P(3HB-co 4HB)/PBAT *** tensile strength reached 33.0 MPa(MD)and 23.5 MPa(TD).the elongation at break exceeded 1309%,and tear strength exceeded 110 kN/*** Young's modulus as low as about 1800 MPa also met packaging *** observations revealed rough and long ligaments,indicating that the tear specimens were broken *** addition of PBAT elastomers was the main reason for the improved toughness of the *** DMA and SEM analysis,it was demonstrated that PLA P(3HB co 4HB),and PBAT were prilly *** increasing P(3HB CO-4HB)content,the melt and cold crstallization of PLA was *** enzymatic degradation experiments indicated that the films had good *** findings gave important implications for designing and manufacturing biodegradation package of high biological carbon content.

关键词： Polylactide Poly(3 hydroxybutyrate co4-hydrxybutyrate) Blown flms Mechanical properties Biodegradability

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Thermal,Rheological and Mechanical Properties of Biodegradable Poly(propylene carbonate)/Epoxidized Soybean Oil Blends

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Chinese Journal of Polymer Science 2021年第12期39卷 1572-1580页

作者： Ling Zhao Shi-Ling Jia Ze-Peng Wang Yun-Jing Chen Jun-Jia Bian Li-Jing Han hui-liang zhang Li-Song Dong Changchun UniversityofTechnology Changchun 130012China Key Laboratory of Polymer Ecomaterials Chinese Academy of SciencesChangchun Institute of Applied ChemistryChangchun 130022China Sinopec-SK(Wuhan)Petrochemical Company Limited Wuhan 430000China

Biodegradable poly(propylene carbonate)(PPC)/epoxidized soybean oil(ESO)blends with different component ratios were prepared by melt blending to improve the performance of *** phase morphology,thermal properties,rheological properties and mechanical properties of the blends were in vestigated in *** exami nation revealed good in terfacial adhesi on betwee n PPC matrix and *** to DSC and DMA,as the content of ESO increased,the glass transition temperature of the PPC component increased,indicating that there was a strong in terfacial in teracti on between the PPC matrix and *** in terfacial in teraction may be caused by rin g-opening reaction between the hydroxyl end groups of PPC and the epoxy groups of ESO,which restricted the chain movement of PPC *** disappearanee of the epoxy groups in FTIR indicated that the in terfacial in teracti on betwee n the two phases was due to the rin g-openi ng reactio n betwee n PPC and *** the addition of ESO,the thermal stabilities were *** the increasing ESO content,the modulus gradually ***,the stre ngth at yield,the strength at break and the elon gation at break were in creased for the PPC/ESO blends,suggest!ng that the enhancement of the strength and toughness of PPC was achieved by the incorporation of *** rheological measurement revealed that the complex viscosity,storage modulus and loss modulus of PPC were in creased with the increasi ng ESO content at low freque ncy,which indicated that the addition of ESO enhanced the melt strength of PPC in stead of plasticizi ng PPC.

关键词： Poly(propylene carbonate) Epoxy soybean oil Compatibility Mechanical properties

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