检索结果-南通市图书馆

Chinese Journal of polymer science 2001年第3期19卷 297-301页

作者： Zi-chen li Yue Shen Yu-zeng liang fu-mian li department of polymer science & engineering college of chemistry peking university beijing 100871, china beijing Univ Coll Chem Dept Polymer Sci & Engn Beijing 100871 Peoples R China

The morphological transition of molecular assemblies in aqueous solutions for a new amphiphilic diblock copolymer induced by changing the initial solvent conditions was studied by transmission electron microscopy (TEM). The copolymer was polystyrene(77)-b-poly[2-(beta -D-glucopyranosyloxy)ethyl acrylate (6)] (PSt(77)-b-PGEA(6)) and the solvent was a mixture of DMF and THF. PSt(77)-b-PGEA(6) yields vesicles and tubules when it is initially dissolved in THF and DMF respectively. The morphological transition between vesicles and tubules can be achieved by simply varying the amounts of THF and DMF, or changing the temperature at which the aggregates were prepared.

关键词： block copolymer amphiphile glycopolymer self-assembly tubule vesicle

DEGRADABLE THERMORESPONSIVE POLYESTERS BY ATOM TRANSFER RADICAL POLYADDITION AND CliCK chemistry

在线全文

学校读者我要写书评

暂无评论

DEGRADABLE THERMORESPONSIVE POLYESTERS BY ATOM TRANSFER RADI...

AI for organic and polymer synthesis

第五届国际高分子化学学术讨论会

作者： li-Jing Zhang Bo-Tao Dong fu-Sheng Du and Zi-Chen li beijing National Laboratory for Molecular sciences(BNLMS) Key Laboratory of polymer chemistry& Physics of Ministry of Education department of polymer science&engineering college of chemistry and Molecular engineering peking university beijing 100871 china.

＜正＞LCST-type thermoresponsive polymers have found a variety of applications in biomedical science ranging from smart surfaces,bio-sensing and tissue engineering to intelligent drug/gene delivery.1 However,as most of the above polymers are based on carbon-carbon backbone,the non-degradability may limit their in vivo

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

science china chemistry 2024年第8期67卷 2461-2496页

作者： Xin Hong Qi Yang Kuangbiao liao Jianfeng Pei Mao Chen Fanyang Mo Hua Lu Wen-Bin Zhang Haisen Zhou Jiaxiao Chen Lebin Su Shuo-Qing Zhang Siyuan liu Xu Huang Yi-Zhou Sun Yuxiang Wang Zexi Zhang Zhunzhun Yu Sanzhong Luo Xue-Feng fu Shu-li You Center of chemistry for Frontier Technologies Department of ChemistryZhejiang UniversityHangzhou 310027China Center of Basic Molecular science Department of ChemistryTsinghua UniversityBeijing 100084China Guangzhou National Laboratory Guangzhou 510005China Center for Quantitative Biology Academy for Advanced Interdisciplinary StudiesPeking UniversityBeijing 100871China State Key Laboratory of Molecular engineering of polymers Department of Macromolecular ScienceFudan UniversityShanghai 200433China School of Materials science and engineering Peking UniversityBeijing 100871China 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 AI for science(AI4S)-Preferred Program Shenzhen Graduate SchoolPeking UniversityShenzhen 518055China State Key Laboratory of Chemical Biology Shanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesChinese Academy of SciencesShanghai 200032China department of Chemical sciences National Natural Science Foundation of ChinaBeijing 100085China State Key Laboratory of Organometallic chemistry Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032China

Recent years have witnessed the transformative impact from the integration of artificial intelligence with organic and polymer synthesis. This synergy offers innovative and intelligent solutions to a range of classic problems in synthetic chemistry. These exciting advancements include the prediction of molecular property, multi-step retrosynthetic pathway planning, elucidation of the structure-performance relationship of single-step transformation, establishment of the quantitative linkage between polymer structures and their functions, design and optimization of polymerization process, prediction of the structure and sequence of biological macromolecules, as well as automated and intelligent synthesis platforms. Chemists can now explore synthetic chemistry with unprecedented precision and efficiency, creating novel reactions, catalysts, and polymer materials under the datadriven paradigm. Despite these thrilling developments, the field of artificial intelligence(AI) synthetic chemistry is still in its infancy, facing challenges and limitations in terms of data openness, model interpretability, as well as software and hardware support. This review aims to provide an overview of the current progress, key challenges, and future development suggestions in the interdisciplinary field between AI and synthetic chemistry. It is hoped that this overview will offer readers a comprehensive understanding of this emerging field, inspiring and promoting further scientific research and development.

关键词： organic synthesis polymer synthesis machine learning prediction chemical database automated synthesis

What Can Topology Bring to chemistry?

在线全文

学校读者我要写书评

暂无评论

CCS chemistry 2024年第9期6卷 2084-2109页

作者： Wei Wang Songtao Zhou Xiujun Yu Qing-Hui Guo Yanhang Ma Jie Song liang Zhang Xuzhou Yan Lu Han Qing liao Xiaopeng li Wen-Bin Zhang Yiyong Mai Shaodong Zhang Shunai Che Hai-Bo Yang Xuefeng fu Mei-Xiang Wang School of chemistry and Molecular engineering East China Normal UniversityShanghai 200062 Hangzhou Institute of Medicine Chinese Academy of SciencesHangzhou 310022Zhejiang college of chemistry and Environmental engineering Shenzhen UniversityShenzhen 518060Guangdong MOE Key Laboratory of Bioorganic Phosphorous and Chemical Biology Department of ChemistryTsinghua UniversityBeijing 100084 School of Physical science and Technology and Shanghai Key Laboratory of High-Resolution Electron Microscopy ShanghaiTech UniversityShanghai 201210 School of chemistry and Chemical engineering Frontiers Science Center for Transformative MoleculesState Key Laboratory of Composite MaterialsShanghai Key Laboratory for Molecular Engineering of Chiral DrugsShanghai Jiao Tong UniversityShanghai 200240 School of Chemical science and engineering Tongji UniversityShanghai 200092 beijing Key Laboratory for Optical Materials and Photonic Devices Department of ChemistryCapital Normal UniversityBeijing 100048 beijing National Laboratory for Molecular sciences Key Laboratory of Polymer Chemistry and Physics of Ministry of EducationCenter for Soft Matter Science and EngineeringCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871 department of Chemical sciences National Natural Science Foundation of ChinaBeijing 10085

The unique mathematical perspectives and principal concepts of topology have not only promoted the development of other branches of mathematics but have also deeply influenced other subjects,particularly physics and *** minireview aims to elucidate the substantial influence of topology on chemistry by critically examining both the contributions of topology to current chemical science and its potential future *** will discuss the topology of molecular structures and assemblies across various scales—from small molecules and mechanically interlocked molecules to polymers,biomacromolecules,and supramolecular *** discussion will include an exploration of cutting-edge techniques for characterizing topological features,underscoring the role of topology as a novel paradigm for the design and synthesis of new molecular ***,a critical analysis of topology’s role in the development of functional materials—such as photonic materials,polymers,biomacromolecules,and chiral materials—will demonstrate its emerging significance as a crucial parameter in unveiling novel properties and *** topology’s formidable potential,it is anticipated to be used increasingly to address pivotal challenges within chemistry and adjacent disciplines.

关键词： chemical topology topological invariants molecular graphs links and knots structureproperty relationship

ACYCliC DIENE METATHESIS polymerIZATION OF TAILOR-MADE MONOMERS TOWARDS SEQUENCE-REGULATED VINYL COpolymerS

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of polymer science 2013年第2期31卷 355-362页

作者： Zi-long li Lei li fu-sheng Du 李子臣 beijing National Laboratory for Molecular sciences (BNLMS) Key Laboratory of Polymer Chemistry & Physics of Ministry of Education Department of Polymer Science & Engineering College of Chemistry and Molecular EngineeringPeking University

Acyclic diene metathesis polymerization （ADMET） enables convenient transfer of sequential information of the designed monomers to the corresponding sequence-regulated copolymers. In this study, two structurally symmetric monomers, M1 and M2, were synthesized via atom transfer radical addition （ATRA） of diethyl meso-2,5- dibromohexanedioate with 1,5-hexadiene and 1,7-octadiene, respectively. Thus, sequenced segment of VB-EA-EA-VB （VB and EA represent vinyl bromide and ethyl acrylate, respectively） was incorporated into the ADMET diene monomers. ADMET polymerization of these two monomers with Grubbs first generation catalyst （Grubbs-I） was performed in CH2C12 at 40℃ for 5 days under nitrogen purge. Effects of catalyst amount, monomer concentration and methanol precipitation on the Mp and PDI of polymers were investigated by GPC, and the structures of the formed polymers were characterized by NMR. Our results indicate that using 3.0 mol% of Grubbs-I to monomer can afford polymers with high Mp. Moreover, selective precipitation in methanol enables complete removal of low molecular weight components from the crude products. Meanwhile, M2 exhibits higher ADMET polymerization reactivity than M1 due to its capability of suppressing negative neighboring group effect.

关键词： ADMET ATRA Sequence-regulated copolymers.

Ring-opening polymerization of 2-Oxabicyclo[2.2.2]octan-3-one and the Influence of Stereochemistry on the Thermal Properties of the Polyesters

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of polymer science 2022年第10期40卷 1173-1182,I0008页

作者： Tong Zhou Yu-Ting Guo fu-Sheng Du Zi-Chen li beijing National Laboratory for Molecular sciences(BNLMS) Key Laboratory of Polym.Chem.&Physics of Ministry of EducationDepartment of Polymer Science&EngineeringCollege of Chemistry and Molecular EngineeringCenter for Soft Matter Science and EngineeringPeking UniversityBeijing 100871China

Polyesters with cyclic structures in the main chain typically possess superior mechanical and thermal properties together with chemical ***-opening polymerization(ROP)of bridged or fused bicyclic lactones is a simple,and in most cases controlled method to synthesize polyesters with alicyclic moieties in the polymer *** stereochemistry of the alicyclic structures has a great effect on the polymer properties,which can be regulated by varying the polymerization ***,we report a systematic investigation on the ROP of 2-oxabicyclo[2.2.2]octan-3-one([2.2.2]VL)under different *** initiated byn-butyl lithium(n-Buli)or catalyzed by trifluoromethanesulfonic acid(TfOH)in the presence of benzyl alcohol,P[2.2.2]VLs containing all cis^(-1),4 disubstituted cyclohexane ring were ***,P[2.2.2]VLs initiated by sodium methoxide(MeONa)or catalyzed by organic superbase contained both cis and trans isomeric structural *** cis to trans transformation mechanism under these conditions was manifested,and the effect of stereochemical variations on the properties ofP[2.2.2]VLwas *** stereoregularP[2.2.2]VLs,bothcisandtrans,exhibited higher crystallinity and melting temperatures(Tm)than those of the stereoirregular ***,the degradation of P[2.2.2]VL with acid at high temperature could recover 3-cyclohexenecarboxylic acid.

关键词： 2-Oxabicyclo[2.2.2]octan-3-one Ring-opening polymerization Stereochemistry Polyester Thermal properties

Dynamic Ring-chain Equilibrium of Nucleophilic Thiol-yne "Click" Polyaddition for Recyclable Poly(dithioacetal)s

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of polymer science 2021年第9期39卷 1146-1154页

作者： Jin-Xia Lei Qi-Yuan Wang fu-Sheng Du Zi-Chen li beijing National Laboratory for Molecular sciences(BNLMS) Key Laboratory of Polym.Chem.&Physics of Ministry of EducationDepartment of Polymer Science&EngineeringCollege of Chemistry and Molecular EngineeringCenter for Soft Matter Science and EngineeringPeking UniversityBeijing 100871China

We report a dynamic polymerization system based on the reversible nucleophilic Michael polyaddition of activated alkynes and *** poly(dithioacetal)s(P1-P4)were prepared via the base-catalyzed thiol-yne"click"polyaddition of two dithiols(1,4-butanedithiol(4S)and 1,5-pentanedithiol(5S))and two alkynones(3-butyn-2-one(Y1)and 1-phenyl-2-propyn-1-one(Y2))at high *** systematically investigated the base-catalyzed polymerization of 4S and Y1(for polymer PI)under different conditions,and found that this polymerization was a highly concentration-dependent dynamic system:polymer PI was formed at high concentration,while seven-membered dithioacetal,1-(1,3-dithiepan-2-yl)propan-2-one(C1),was obtained at low *** polymerization of 4S and Y2(for polymer P4)displayed similar polymerization behavior,generating 2-(1,3-dithiepan-2-yl)-1-phenylethanone(C4)at low *** the contrary,polymer P2(from Y1 and 5S)was exclusively obtained with no formation of eight-membered *** polymerizations of Y1 with 1,2-ethanedithiol(2S)and 1,3-dimercaptopropane(3S)only afforded corresponding five-and six-membered dithioacetals,1-(1,3-dithiolan-2-yl)propan-2-one(C2)and 1-(1,3-dithian-2-yl)propan-2-one(C3).This dynamic behavior of PI and P4 was attributed to the concentration-dependent retro-Michael addition reaction between a thiol and a β-sulfido-α,β-unsaturated carbonyl compound catalyzed by ***,polymers P1 and P4 could be depolymerized into Cl and C4 in yields of 58% and 95%,*** ring-opening polymerization of Cl at high concentration could successfully regenerate polymer ***,a new type of closed-loop recyclable poly(dithioacetal)s was developed.

关键词： Poly(dithioacetal)s Nucleophilic thiol-yne"click"polyaddition Chemical recycling Ring-chain equilibrium

在线全文

学校读者我要写书评

暂无评论

中国改革开放以来的高分子物理和表征研究

高分子学报 2019年第10期50卷 1047-1067页

作者：安立佳陈尔强崔树勋董侠傅强韩艳春何嘉松胡文兵胡祖明江明李宝会李良彬李林李卫华林嘉平吕中元门永锋沈志豪孙平川童真王笃金武培怡谢续明徐坚徐志康薛奇闫寿科杨玉良俞炜俞燕蕾张广照张军张俐娜张平文张文科赵江郑强周东山中国科学院长春应用化学研究所长春130022 北京大学化学与分子工程学院北京100871 西南交通大学材料先进技术教育部重点实验室成都610031 中国科学院化学研究所北京100090 四川大学高分子科学与工程学院成都610065 南京大学化学化工学院南京210023 东华大学纤维材料改性国家重点实验室上海200051 复旦大学高分子科学系上海200433 南开大学物理学院天津300071 中国科技大学国家同步辐射实验室合肥230026 北京师范大学化学学院北京100875 华东理工大学材料科学与工程学院上海200237 吉林大学理论化学研究所长春130023 华南理工大学材料科学与工程学院广州510640 清华大学化工系北京100084 浙江大学高分子科学与工程学系杭州310027 北京化工大学材料科学与工程学院北京100029 上海交通大学化学化工学院上海200240 武汉大学化学与分子科学学院武汉430072

本综述介绍了改革开放四十多年来中国大陆学者在高分子物理和表征领域所取得的部分成就.按照时间顺序,分别从概念的突破、理论的发展和技术的创新三个方面选取具有代表性研究成果进行简短的介绍,以期展示当代中国学者在这一基础研究领... 详细信息

本综述介绍了改革开放四十多年来中国大陆学者在高分子物理和表征领域所取得的部分成就.按照时间顺序,分别从概念的突破、理论的发展和技术的创新三个方面选取具有代表性研究成果进行简短的介绍,以期展示当代中国学者在这一基础研究领域所表现出来的拼搏意志和创新精神,激励新一代学者共同努力,勇攀科学高峰,为国民经济和社会发展作出更大的贡献.

关键词：高分子物理高分子表征相分离结晶流变和力学性质