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SYNTHESIS OF A SILICON-CONTAINING FLAME RETARdanT AND ITS SYNERGISTIC EFFECT WITH POTASSIUM-4-(PHENYLSULFONYL)BENZENESULFONATE(KSS) IN POLYCARBONATE(PC)

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Chinese Journal of Polymer Science 2013年第10期31卷 1352-1358页

作者： dan-dan yuan Xu-fu Cai Department of Polymer Science and Materials State Key Laboratory of Polymer Materials Engineering Sichuan University

A novel flame retardant （DAPSiO）, containing silicon and nitrogen, was synthesized by using dichlorodiphenylsilane, γchloropropyl methyl dimethoxysilane and 1,2-ethanediamine. DAPSiO was used together with potassium-4-（phenylsulfonyl）benzenesulfonate （KSS） to prepare a flame-retardant system for polycarbonate （PC）. The structure of DAPSiO was characterized by Fourier transform infrared spectroscopy （FTIR）, and 1H-NMR tests. Flammability and thermal behaviors of PC/KSS/DAPSiO systems were estimated by limited oxygen index （LOI）, vertical burning test （UL-94） and thermogravimetric analysis （TGA） tests. The results showed that the flame retardancy and thermal stability of PC/KSS system were improved with the addition of DAPSiO. When 1 wt% DAPSiO and 0.5 wt% KSS were incorporated, the LOI value of PC was found to be 44, and class V-0 of UL-94 test was passed. The scanning electron microscopy （SEM） and FTIR indicated that PC/KSS/DAPSiO system held a more cohesive and denser char structure when compared with pure PC and PC/KSS system.

关键词： Flame retardant Thermal properties Silicon Polycarbonate.

Synthesis of a Novel Conjugate of Bromoarene and Polyamide Containing N-Methylimidazoles

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Chinese Chemical Letters 2005年第10期16卷 1330-1332页

作者： dan LIU Gu yuan Department of Chemical Biology The Key Laboratory of Bioorganic Chemistry and MolecularEngineering of Ministry of Education College of Chemistry Peking University Beijing 100871

A novel DNA cleavage conjugate of bromoarene and polyamide containing three N-methylimidazole rings was synthesized by the chloroform reaction and the DCC/HOBT coupling reaction.

关键词： DNA cleavage bromoarene polyamide chloroform reaction.

Effect of long-term thermal exposure on microstructure of laser-welded UNS N10003 alloy

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Nuclear Science and Techniques 2024年第11期35卷 73-81页

作者： Kun Yu yuan Zhang Xiao-dan yuan Li-Bin Zhao Zhi-Jun Li Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Nuclear and Radiation Safety Center Beijing 100082China

The evolution of the microstructure and tensile rupture mechanism of laser welds in UNS N10003 alloy exposed to 700℃are *** M_(6)C carbides precipitate around the primary eutectic M_(6)C-γcarbides in the fusion zone after 100 h of *** long-term thermal exposure,the size of the fine M_(6)C carbides *** eutectic M_(6)C-γcarbides in the as-welded fusion zone transformed into spherical M_(6)C carbides as the exposure time extends to 10000 ***,the spherical M_(6)C particles exhibit size coarsening with increasing exposure *** tensile properties of the welded joints are not adversely affected by the evolution of eutectic M_(6)C-γcarbides and the coarsening of M_(6)C carbides.

关键词： UNS N10003 alloy Laser welding M_(6)C Long-term thermal exposure

Cushing＇s syndrome during pregnancy caused by adrenal cortical adenoma： a case report and literature review

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Frontiers of Medicine 2015年第3期9卷 380-383页

作者： Wei Wang Fengyi yuan dan Xu Department of Endocrinology and Metabolism Shenzhen People 's Hospital Shenzhen 518020 China

Cushing＇s syndrome （CS） during pregnancy is a rare condition with Significant maternal and fetal complications. A case of CS during the third trimester of pregnancy secondary to adrenocortical adenoma was reported. Literature review revealed the disadvantages of different treatments in this period. Besides the conservative treatment, surgery is recommended for CS during the third trimester of pregnancy secondary to adrenal adenoma, if an experienced surgeon is available.

关键词： Cushing's syndrome pregnancy adrenocortical adenoma

Encapsulation of ionic liquid, phosphotungstic acid inside the nanocages of MIL-101(Cr): Effective and reusable catalyst for efficient solvent-free oxidative desulfurization from fuel oil

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Petroleum Science 2023年第6期20卷 3865-3874页

作者： Bo-Long Jiang Dong-Xu Zhang dan-dan yuan Yan-Guang Chen Tian-Zhen Hao Hua Song Innovation Institute for Sustainable Maritime Architecture Research and Technology Qingdao University of TechnologyQingdao 266000ShandongChina Provincial Key Laboratory of Oil&Gas Chemical Technology College of Chemistry&Chemical EngineeringNortheast Petroleum UniversityDaqing 163318HeilongjingChina Hebei Jingzhi Technology Co. LTDCangzhou 061000HebeiChina

Oxidative desulfurization from fuel oil is one of the important methods for deep *** development of efficient oxidative desulfurization catalysts is crucial for improving the desulfurization *** encapsulation of phosphotungstic acid(HPW)and ionic liquid(BMImBr)inside the mesoporous cages of MIL-101(Cr)was accomplished through a combination of“bottle around ship”and“ship in bottle”*** obtained BMImPW@MIL-101(Cr)composite was characterized by XRD,FTIR,BET,SEM,XPS and ICP *** indicated that the BMImPW@MIL-101(Cr)composites with PW^(3−) loading of 23.1–50.7 wt%were obtained,demonstrating that the“bottle around ship”method is beneficial to make full use of nanocages of MIL-101(Cr)to obtain expected high loading of active PW^(3−) .The BMImPW@MIL-101(Cr)exhibits excellent reusability with no evidence of leaching of active PW^(3−) and BMIm^(+),and well-preserved structure after successive cycles of regeneration and *** significantly improved stability of BMImPW@MIL-101(Cr)as compared to HPW@MIL-101(Cr)is possibly because the leaching of the active PW^(3−) −sites can be greatly suppressed by forming large size of BMImPW owing to introduction of BMIm^(+)*** BMImPW@MIL-101(Cr)exhibited excellent catalytic activity for solvent free oxidative desulfurization of refractory *** enhanced oxidative desulfurization activity as compared to HPW@MIL-101(Cr)can be explained by the intimate contact of sulfides with active PW^(3−) sites owing the strong attraction of BMIm^(+)cation with the sulfides.

关键词： Metal organic frameworks Phosphotungstic acid lonic liquids Stability Oxidative desulfurization

Cycloaddition Reactions of Epoxides and CO_(2)Catalyzed by Bifunctional Rare-Earth Metal Complexes Bearing Amino-Bridged Tris(phenolato)Ligands

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Chinese Journal of Chemistry 2024年第14期42卷 1571-1581页

作者： Yongjie Chen Yanwei Wang Jun Nong dan yuan Yingming Yao Key Laboratory of Organic Synthesis of Jiangsu Province College of ChemistryChemical Engineering and Materials ScienceDushu Lake CampusSoochow UniversitySuzhouJiangsu215123 China

Eight zwitterionic rare earth metal complexes stabilized by amino-bridged tris(phenolato)ligands bearing quaternary ammonium side-arms were synthesized and *** complexes were used as single-component catalysts for the cycloaddition of CO_(2)and epoxides,and their catalytic activities are obviously higher than those of their binary *** studies revealed that the halide anions(Cl^(–),Br^(–),I^(–))and the metal complexes influenced the catalytic activity,and the lanthanum complex bearing iodide anion showed the highest catalytic activity for this addition reaction.A variety of mono-substituted epoxides were converted to cyclic carbonates in good to excellent yields(55%—99%)with high selectivity(>99%)at 30℃and 1 bar CO_(2),whereas internal epoxides required higher both reaction temperatures(60—120℃)and catalyst loading(2 mol%)for high *** catalyst was recyclable for four times without noticeable loss of catalytic *** on the results of kinetic studies and in℃situ IR reactions,a plausible reaction mechanism was proposed.

关键词： Bifunctional catalyst Carbon dioxide Cyclic carbonate Rare-earth metal Tris(phenolato)ligand Insertion Cycloaddition C1 building blocks

Alternating copolymerization of CO_(2) and cyclohexene oxide initiated by rare-earth metal complexes stabilized by o-phenylenediamine-bridged tris(phenolate)ligand

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Journal of Rare Earths 2022年第9期40卷 1471-1479,I0005页

作者： Quanyou Yao Yongjie Chen Yaorong Wang dan yuan Hongpeng You Yingming Yao Key Laboratory of Organic Synthesis of Jiangsu Province College of ChemistryChemical Engineering and Materials ScienceDushu Lake CampusSoochow UniversitySuzhou 215123China State Key Laboratory of Rare-Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China

A series of o-phenylenediamine bridged tris(phenolate)ligand-stabilized rare-earth metal complexes were synthesized and ***(complex 1),neodymium(complex 2^(tBu)),and yttrium(complex 3)complexes stabilized by ligand of buiky tert-butyl substituents are mononuclear,whereas neodymium complexes 2^(Me)and 2^(C1)bearing smaller methyl and chloro substituents are dinuclear,*** were applied in the alternating copolymerization of CO_(2)and cyclohexene *** addition of benzyl alcohol is beneficial to improving yields(up to 86%)and selectivity of poly(carbonate)(up to 99%).Stoichiometric reaction of benzyl alcohol with rare-earth metal complexes 1 and 2^(tBu)results in formation of complexes 4 and 5 as dinuclear complexes with benzyl alcohol coordination,which was confirmed via single crystal X-ray diffraction analysis,and nuclear magnetic resonance(NMR)spectroscopy(for 4).Complex 5 shows equally good activity and selectivity of that of complex 2^(tBu)and benzyl alcohol,consolidating that complex 5 is indeed generated during *** neodymium tris(phenolate)5 is one of the few examples of rare-earth metal complex as a single-component initiator for copolymerization of epoxide and CO_(2).Matrix-assisted laser desorption ionization-time of flight(MALDI-TOF)mass spectrometry analysis proves benzyloxy group as the chain end.^(1)H NMR monitoring suggests that the insertion of CO_(2)may be the first step in the growth of the polymer chain.

关键词： Rare earths CO_(2) Copolymerization Polycarbonate Single-component initiator

Effect of comprehensive management combined with cognitive intervention on patient cooperation and complications during digestive endoscopy

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World Journal of Gastrointestinal Surgery 2024年第11期16卷 3531-3537页

作者： Jin-dan yuan Zhi-Zhi Zhang Digestive Endoscopy Center The First Affiliated Hospital of Soochow UniversitySuzhou 215000Jiangsu ProvinceChina

BACKGROUND As lifestyles continue to change worldwide,the incidence of digestive tract carcinoma has gradually *** endoscopy is an important tool that can assist in the diagnosis,treatment,and surgical intervention for this ***,the examination process is affected by many factors,and patient cooperation is often poor,which can increase the risk of *** To explore the effects of integrated management and cognitive intervention on cooperation and complications in patients undergoing endoscopy for early gastrointestinal *** A total of 354 patients with early stage gastrointestinal cancer who underwent digestive endoscopy procedures between January and December 2023 at our hospital were divided into observation and control groups(177 patients in each group)in a randomized controlled blind *** control group received routine interventions,while the observation group received comprehensive integrated management combined with cognitive *** compared the changes in adverse mood,discomfort,examination time,cooperation with the examination,and complications before and after the intervention between the two *** The self-rated anxiety and depression scale scores were lower in the observation group than in the control group(P<0.05).The visual analog scale scores for discomfort during intubation and examination were also lower in the observation group than in the control group(P<0.05).Furthermore,the examination time was shorter in the observation group than in the control group(P<0.05),and the degree of cooperation(94.35%)was higher in the observation group than in the control group(84.75%;P<0.05).Lastly,the incidence rates of gastrointestinal adverse reactions(10.17%vs 20.34%),choking agitation(14.69%vs 24.86%),abdominal pain(8.47%vs 18.08%),and muscle tension(5.08%vs 14.12%)were all lower in the observation group than in the control group(P<0.05).CONCLUSION Integrated management and cognitive int

关键词： Digestive endoscopy Comprehensive integrated management Cognitive intervention Cooperation Complications

A convenient method to prepare random LA/CL copolymers from poly(L-lactide) and ε-caprolactone

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Science China Chemistry 2018年第6期61卷 708-714页

作者： Hao Ouyang Kun Nie dan yuan Yong Zhang Dongmei Cui Yingming Yao Key Laboratory of Organic Synthesis of Jiangsu Province Suzhou Key Laboratory of Macromolecular Design and Precision Synthesisand State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials College of Chemistry Chemical Engineering and Materials Science Dushu Lake Campus Soochow University School of Chemistry and Chemical Engineering Taishan University State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences

Sequential addition of L-lactide(LA) followed by ε-caprolactone(CL), and simultaneous addition of both monomers, afforded random LA/CL copolymers in the presence of lanthanide aryloxides under mild conditions. Transesterification was proved to play a predominant role in random copolymer formation. Moreover, treatment of poly(L-lactide) with ε-CL led to random copolymer formation, which provides a new strategy not only to prepare random LA/CL copolymers, but also to directly modify PLLA.

关键词： random copolymers lanthanide complex transesterification lactide ε-caprolactone