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New sustainable polymers with on-demand depolymerization property

Science China Chemistry 2024年第9期67卷 2803-2841页

作者： Yangyang Sun Zesheng An Yanshan Gao Rongrong Hu Ye Liu Hua Lu Xiao-Bing Lu Xuan Pang Anjun Qin Yong Shen Youhua Tao Yu-Zhong Wang Junpeng Wang Gang Wu Guang-Peng Wu Tie-Qi Xu Xing-Hong Zhang Yuetao Zhang Zhenbiao Zhang jian-bo zhu Miao Hong Zhibo Li State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032China State Key Laboratory Base of Eco-Chemical Engineering College of Chemical EngineeringQingdao University of Science and TechnologyQingdao266042China State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012China State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular AggregatesSouth China University of TechnologyGuangzhou 510640China State Key Laboratory of Fine Chemicals Frontiers Science Center for Smart MaterialsDalian University of TechnologyDalian 116024China Beijing National Laboratory for Molecular Sciences Center for Soft Matter Science and EngineeringKey Laboratory of Polymer Chemistry and Physics of Ministry of EducationCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials(MoE) National Engineering Laboratory of Eco-Friendly Polymeric Materials(Sichuan)College of ChemistryState Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610064China School of Polymer Science and Polymer Engineering the University of AkronAkronOH 44325USA MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials Jiangsu Key Laboratory of Advanced Functional Polymer Design and ApplicationSuzhou Key Laboratory of Macromolecular Design and Precision SynthesisCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China

To combat the crisis of today's synthetic polymers arising from unsustainable production and disposal,it is essential for the synthetic polymer community to reshape the current polymer industry with sustainable *** an emerging class of sustainable polymers,the development of chemically depolymerizable polymers(CDPs),which can undergo closed-loop depolymerization/repolymerization cycles to reproduce virgin polymers without the loss of properties from recovered monomers,offers an ideal solution to preserve finite natural resources,provides a feasible solution to the end-of-life issue of polymer waste,and thereby establishes a circular materials ***,two grand key challenges have been encountered in the establishment of practically useful CDPs:how to balance polymerization and depolymerization ability and how to unify conflicted depolymerizability and physical ***,this critical review article presents our vision for summarizing feasible strategies to overcome the above two significant challenges and the design principles for constructing an ideal CDP by highlighting selected major progress made in this rapidly expanding field.

关键词： chemically depolymerizable polymers sustainable polymers depolymerization monomer recovery degradation plastics

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Ring-Opening Polymerization of a Benzyl-Protected Cyclic Ester towards Functional Aliphatic Polyester

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Chinese Journal of Chemistry 2022年第24期40卷 2973-2980,I0002页

作者： Xing Yang Hua-Zhong Fan Zhongzheng Cai Qi Zhang jian-bo zhu National Engineering Laboratory of Eco-Friendly Polymeric Materials(Sichuan) College of ChemistrySichuan University29 Wangjiang RoadChengduSichuan610064 China Key Laboratory of Green Chemistry and Technology of Ministry of Education College of ChemistrySichuan University29 Wangjiang RoadChengduSichuan610064 China

Monomer design strategy has become a powerful tool to access polymers with desired and diverse functionalities. Here, we designed a novel monomer 2-((benzyloxy)methyl)-1,4-oxathiepan-7-one (BTO) via installing a benzyl ether side chain to the structure of 1,4-oxathiepan-7-one (OTO). The ring-opening polymerization of BTO with Zn1 as the catalyst demonstrated the characteristics of living polymerization with turnover frequency (TOF) up to 2520 h^(−1). With a [BTO]_(0)/[Zn1]_(0)/[I]_(0) feed ratio of 2000/2/1, polymer with high number-average molecular weight (Mn = 536 kDa) and narrow dispersity (Ð = 1.06) was obtained. The produced polymer with a glass transition temperature of -17℃ behaved as an elastomer at room temperature. Consequently, the monomer BTO was copolymerized with _(L)-LA to modulate the mechanical properties of P(L-LA). When the BTO content is 10%, the copolymer exhibits excellent strength (24 MPa) and elongation at break (270%), affording a crystalline, hard, and tough plastic material that combines the high ductility of P(BTO) and the high modulus of P(_(L)-LA). In addition, the oxidation of P(BTO) to P(BTO)-SO_(2) led to an improvement of T_(g) from -17℃ to 38℃. Debenzylation of P(BTO)-SO_(2) afforded P(BTO)-SO_(2)-OH containing free hydroxyl groups. Ultimately, P(BTO) could be hydrolyzed under a base condition to recover the corresponding hydroxyl acid intermediate, which could be used to prepare the monomer again and complete the closed-loop from monomer to polymer to monomer.

关键词： Ring-opening polymerization Copolymerization Block copolymers Post polymerization modification Closed loop recling

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乳腺钙化诊断良恶性疾病的临床钼靶X线分析——附380例报告

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中国实用医药 2024年第2期19卷 85-88页

作者：郜玉书严芳朱建波南通大学附属泰州妇产医院放射线科 225300 南通大学附属泰州妇产医院乳外科 225300

目的分析乳腺疾病患者的乳腺钙化性质及钼靶X线影像表现,为临床提供最佳治疗方案具有重要意义。方法回顾型分析经穿刺、麦默通、手术临床病理证实且资料完整的380例乳腺疾病患者的临床资料,所有病例均行钼靶X线检查,对其钙化形状、边... 详细信息

目的分析乳腺疾病患者的乳腺钙化性质及钼靶X线影像表现,为临床提供最佳治疗方案具有重要意义。方法回顾型分析经穿刺、麦默通、手术临床病理证实且资料完整的380例乳腺疾病患者的临床资料,所有病例均行钼靶X线检查,对其钙化形状、边缘、大小、密度、数目、分布及周围临近组织影像改变进行回顾性综合分析。结果 380例患者中良性钙化296例,占78%,其中纤维囊性变41例、乳导管钙化69例、血管钙化17例、皮脂腺钙化3例、脂肪瘤3例、手术缝合线钙化4例、外伤瘢痕钙化3例,出血机化2例,结节钙化68例,退行性变14例,纤维腺瘤72例;恶性钙化84例,占22%,其中浸润导管癌56例、髓样癌18例、浸润小叶癌6例、囊腺癌4例。乳腺钙化分腺体组织内钙化和腺体组织外钙化,腺体组织内(导管内或小叶腺泡内)345例、腺体组织外35例,其中血管钙化17例、外伤瘢痕钙化3例、手术缝合线钙化4例、积乳囊肿7例、皮脂腺钙化3例、脂肪瘤3例。斑片状、点状钙化密度较高、边缘清晰,泥沙样、针尖样蠕虫样钙化,密度较低、边缘欠清晰;圆环形、双轨样钙化形状固定。结论分析乳腺良恶性钙化征,对乳腺良恶性病变诊断鉴别诊断,特别是微小乳腺癌、导管浸润癌的早期诊断早治疗具有重要临床意义。

关键词：良恶性钙化早期诊断沿乳叶分布簇状钙化结构聚集

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A facile approach towards high-performance poly(thioether-thioester)s with full recyclability

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Science China Chemistry 2023年第1期66卷 251-258页

作者： jiang Dai Wei Xiong Mu-Rong Du Gang Wu Zhongzheng Cai jian-bo zhu National Engineering Laboratory of Eco-Friendly Polymeric Materials(Sichuan) College of ChemistrySichuan UniversityChengdu 610064China

Developing new chemically recyclable polymers is important for a circular plastics ***,we prepared a class of 1,4-dithian-2-one(DTO)with thioether and thioester *** sulfur-substituted monomers(DTO)showed excellent reactivity for ring-opening polymerization(turnover frequency(TOF)up to 2.3×10^(4)h^(-1)),which afforded poly(thioetherthioester)s(P(DTO)s)with high air stability,high crystallinity,and commercial high-density polyethylene-like mechanical property(σB=29.59±1.08 MPa andεB=749%±36%).Intriguingly,chemical recycling of P(DTO)to monomer could be accomplished with excellent efficiency in dilute solution(1 min)at room temperature or even from a commodity plastic waste mixture under catalyst-free thermal bulk condition(180°C),thus establishing its circular life cycle.P(Me-DTO)could be applied for selective removal of Hg^(2+)with>99%removal *** importantly,Me-DTO could be recovered in high yield after utilization for Hg^(2+)adsorption.

关键词： chemically recyclable polymer plastic polythioester ring-opening polymerization mercury adsorption

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Functionalizable and Recyclable Aliphatic Polycarbonates Derived from Biomass Feedstocks and CO_(2)

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Chemical Research in Chinese Universities 2023年第5期39卷 809-815页

作者： WU Yanchen FAN Huazhong SHAN Siyi WANG Siqi CAI Zhongzheng zhu jian-bo National Engineering Laboratory of Eco-Friendly Polymeric Materials(Sichuan) College of ChemistrySichuan UniversityChengdu 610064P.R.China

Two bio-based seven-membered cyclic carbonate monomers M1 and M2 were synthesized in three steps from myrcene,which could produce polycarbonates via ring-opening polymerization using metal or organic *** functionalizable olefin moieties in resulting polycarbonates have driven post-polymerization modifications via radical cross-linking and hydrogenation,enabling the resulting polymers with tunable thermal *** importantly,the chemical recycling of P(M)s was achieved through"monomer→polymer⇄dimer",which presented a platform for the synthesis of chemically recyclable biobased polycarbonates.

关键词： Biomass CO_(2) Polycarbonate Functionalization Chemical recyclability

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Predicting the prognosis of primary orbital lymphoma by clinical characteristics and imaging features

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International Journal of Ophthalmology(English edition) 2023年第5期16卷 705-711页

作者： jian-bo zhu Bin Li Hong-Mei Zhang Ning-Li Wang Beijing Tongren Eye Center Beijing Tongren HospitalCapital Medical UniversityBeijing Key Laboratory of Ophthalmology and Visual ScienceBeijing 100730China Department of Diagnostic Radiology Cancer HospitalChinese Academy of Medical SciencesBeijing 100021China

AIM: To analyze the 5-year disease-free survival(DFS) of primary orbital lymphoma(POL) by clinical characteristics and imaging ***: A total of 72 patients, 43 males and 29 females, with histologically confirmed POL, were retrospectively recruited between January 2012 and May 2017. The information on clinical characteristics, imaging features, and 5-year DFS was obtained. Univariate and multivariate forward logistic regression analyses were used to identify the variables significantly associated with 5-year DFS. Kaplan-Meier was applied for survival analysis. RESULTS: Univariate analysis revealed that uni-or bilateral orbital involvement, single or multiple lesions, treatment methods, and contrast enhancement pattern on images were significant for 5-year DFS(P=0.022, 0.042, <0.001, and 0.028, respectively), while in multivariate logistic regression analysis, only uni-or bilateral orbital involvement, treatment methods and contrast enhancement pattern on images were significant(r=0.453, 0.897, and 0.556, P=0.038, <0.001 and 0.022, respectively). The survival curves for DFS were obtained. CONCLUSION: The majority of POL are B-cell lymphomas. Unilateral orbital involvement, homogeneous contrast enhancement on images, and the appropriate treatment schemes result to be significant factors for a good prognosis for POL.

关键词： lymphoma orbital primary prognosis

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劳模精神、劳动精神、工匠精神融合培育路径探索

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教育教学论坛 2024年第23期 145-148页

作者：陈素娟朱剑波宗延延苏州农业职业技术学院园艺科技学院江苏苏州215008

劳模精神、劳动精神、工匠精神是我国人民在长期的劳动实践中培育形成的优良精神,是爱国主义精神、奋斗精神、创新精神的生动体现。涉农高职院校承担着农业人才培养、农业应用技术研究与服务“三农”等重任,强化劳模精神、劳动精神、工... 详细信息

劳模精神、劳动精神、工匠精神是我国人民在长期的劳动实践中培育形成的优良精神,是爱国主义精神、奋斗精神、创新精神的生动体现。涉农高职院校承担着农业人才培养、农业应用技术研究与服务“三农”等重任,强化劳模精神、劳动精神、工匠精神融合培育对农业类高职院校尤为重要。针对涉农高职院校学生特点,结合苏州农业职业技术学院的办学特色以及涉农专业人才培养目标和需求,提出了将劳模精神、劳动精神、工匠精神融合培育的现实意义与有效路径,为涉农院校培养农业战线上德智体美劳全面发展的学生、提升学生的职业素养与职业能力提供借鉴。

关键词：涉农高职院校劳模精神劳动精神工匠精神融合培育

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Evolution of MnO–SiO2–Al_(2)O_(3)–MgO inclusions during heat treatment at 1100℃

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Journal of Iron and Steel Research International 2024年第5期31卷 1221-1231页

作者： Xu-bo Lei jian-li Li Qiang Zeng Hang-yu zhu Yue Yu The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081HubeiChina Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking Wuhan University of Science and TechnologyWuhan430081HubeiChina Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan430081HubeiChina

To investigate the evolutionary behavior of the MnO–SiO_(2)–Al_(2)O_(3)–MgO inclusions during heat treatment,water quenched samples were isothermally held at 1100°C for 120 min in Ar and air atmosphere,and the obtaining samples were analyzed by X-ray diffraction,scanning electron microscopy and energy dispersive *** showed that 3MnO·Al_(2)O_(3)·3SiO_(2)and MnO·SiO_(2)were detected in the 5 wt.%MgO system after isothermal holding in Ar atmosphere,while MgO·Al_(2)O_(3),MnO·SiO_(2)and Mn7O8·SiO4 were detected in air *** evolutionary behavior of the 10,15 and 20 wt.%MgO systems after isothermal holding in different atmosphere were *** affected the solid phase transformation of the low MgO content *** calculation results of FactSage 8.1 showed that MgO·Al_(2)O_(3)was formed in the 5 wt.%MgO system with air *** solid phase transformation was accompanied by grain coarsening during the isothermal holding *** differences in the solid phase transformation in different atmosphere of the 5 wt.%MgO system indicated that it was a gas-phase transport grain coarsening *** enrichment of Al element in the liquid phase region at the grain edges,the homogeneous distribution of Mg element and the disappearance of the liquid phase within the crystal revealed that other MgO content systems were liquid–solid transport grain coarsening mechanism.

关键词： Evolution Glassy phase Inclusion Heat treatment MgO·Al_(2)O_(3)

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D-serine reduces memory impairment and neuronal damage induced by chronic lead exposure

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Neural Regeneration Research 2021年第5期16卷 836-841页

作者： jian-zhu bo Ling Xue Shuang Li Jing-Wen Yin Zheng-Yao Li Xi Wang Jun-Feng Wang Yan-Shu Zhang College of Public Health North China University of Science and TechnologyTangshanHebei ProvinceChina Laboratory Animal Center North China University of Science and TechnologyTangshanHebei ProvinceChina

Although exogenous D-serine has been applied as a neural regulatory intervention in many studies,the role played by D-serine in hippocampal injuries caused by lead exposure remains poorly *** models of chronic lead exposure were established through the administration of 0.05%lead acetate for 8 ***,rats were administered 30 or 60 mg/kg D-serine,intraperitoneally,twice a *** results showed that D-serine treatment shortened the escape latency from the Morris water maze,increased the number of times that mice crossed the original platform location,and alleviated the pathological damage experienced by hippocampal neurons in response to lead *** D-serine administration did not increase the expression levels of the N-methyl-D-aspartate receptor subtype 2B(NR2B)in the hippocampi of lead-exposed rats,60 mg/kg D-serine treatment restored the expression levels of NR2A,which are reduced by lead *** findings suggested that D-serine can alleviate learning and memory impairments induced by lead exposure and that the underlying mechanism is associated with the increased expression of NR2A in the *** study was approved by the Animal Ethics Committee of North China University of Science and Technology,China(approval ***2018155)on December 21,2018.

关键词： D-serine hippocampus lead neurological function N-methyl-D-aspartate poisoning protection repair

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Jetting of a near-wall cavitation bubble induced by another tandem bubble

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Journal of Hydrodynamics 2024年第3期36卷 444-456页

作者： Hui Han Jing-zhu Wang jian-lin Huang Peng-bo Bai Yong-gang Chen Yi-wei Wang Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing100190China School of Engineering Science University of Chinese Academy of SciencesBeijing100049China Guangdong Aerospace Research Academy Guangzhou511458China School of Future Technology University of Chinese Academy of SciencesBeijing100049China jianghuai Advance Technology Center Hefei230088China

Double bubbles near a rigid wall surface collapse to produce a significant jet impact,with potential applications in surface cleaning and ultrasonic ***,the dynamic behaviors of near-wall bubbles remain *** this study,we investigate the jetting of a near-wall bubble induced by another tandem *** define two dimensionless standoff distances,γ_(1),γ_(2),to represent the distances from the center of the near-wall bubble to the rigid wall and the center of controlling bubble to the center of the near-wall bubble,*** observations reveal three distinct jetting regimes for the near-wall bubble:transferred jetting,double jetting,and directed *** further investigate the jetting mechanism,numerical simulations are conducted using the compressibleInterFoam solver in the open-source framework of OpenFOAM.A detailed analysis shows that the transferred jet flow is caused by the pinch-off resulting from the axial contraction velocity at the lower end of the near-wall bubble being greater than the vertical contraction velocity,leading to a maximum jet velocity of 682.58 m/*** the case of double jetting,intense stretching between the controlling bubble and the wall leads to a pinch-off and a double jetting with a maximum velocity of 1096.29 m/*** directed jet flow is caused by the downward movement of the high-pressure region generated by the premature collapse of the controlling bubble,with the maximum jet velocity reaching 444.62 m/s.

关键词： Jetting of near-wall bubble controlling bubble impact velocity

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