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Synthesis and Characterization of Temperature-sensitive Cellulose-graftPoly(N-isopropylacrylamide) Copolymers

Chinese Journal of Polymer Science 2015年第12期33卷 1640-1649页

作者： Li-li Yang Jin-ming Zhang Jia-song He 张军甘志华 Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Engineering Plastics Institute of ChemistryChinese Academy of Sciences (CAS) University of Chinese Academy of Sciences State Key Laboratory of Organic-inorganic Composites Beijing Laboratory of Biomaterials College of Life Science and Technology Beijing University of Chemical Technology

A new series of cellulose-graft-poly（N-isopropylacrylamide）（cellulose-g-PNIPAM） copolymers were prepared by atom transfer radical polymerization （ATRP） of N-isopropylacrylamide monomers from a cellulose-based macro-initiator, which was homogeneously synthesized in an ionic liquid 1-allyl-3-methylimidazolium chloride （AmimC1）. The composition of cellulose-g-PNIPAM copolymers could be adjusted by altering the feeding ratio and reaction time. The resultant copolymers with relatively high content of PNIPAM segments （molar substitution of PNIPAM ≥ 18.3） were soluble.in water at room temperature. Aqueous solutions of cellulose-g-PNIPAM copolymers exhibited clear temperature-sensitive behavior, and their sol-to-gel phase transition properties were investigated by dynamic light scattering （DLS） and UV measurements. Compared with pure PNIPAM, the cellulose-g-PNIPAM copolymers possessed higher lower critical solution temperatures （LCST） in a range from 36.9 ℃ to 40.8 ℃, which are close to normal human body temperature, and could be tuned by adjusting the content of PNIPAM segments in copolymers. Spherical structure of cellulose-g-PNIPAM copolymers formed at temperatures above LCST and its morphology was observed by TEM and SEM. These novel cellulose-g-PNIPAM copolymers may be attractive substrates for some biomedical applications, such as drug release and tissue engineering.

关键词： Cellulose-g-PNIPAM ATRP Temperature-sensitive water soluble.

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A SYNTHETIC APPROACH FOR water soluble.HYPERBRANCHED POLY(N,N-ETHYLIDENEBIS(N-2-CHLOROACETYL ACRYLAMIDE)) WITH HIGH DEGREE OF BRANCHING VIA ATOM TRANSFER RADICAL POLYMERIZATION/SELF-CONDENSING VINYL POLYMERIZATION

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Chinese Journal of Polymer Science 2013年第7期31卷 1038-1045页

作者： Li-bin Bai Rong-rong Zheng Wen-liang Li Yong-gang Wu 巴信武 Hai-jun Wang College of Chemistry and Environmental Science Hebei University Key Laboratory of Medical Chemistry and Molecular Diagnosis Ministry of EducationHebei University

A novel acrylamide A2B2＊（A = alkene, B＊ = alkyl chlorine） type inimer was obtained from commercially available 1,2-ethylenediamine, chloroacetyl chloride and acryloyl chloride. The as-prepared monomer can form water-soluble.hyperbranched poly（N,N-ethylidene bis（N-2-chloroacetyl acrylamide））s （HPECA） through atom transfer radical polymerization/self-condensing vinyl polymerization method in the presence alkyl chlorine/CuCl/2,2-bipyridine activation system which can effectively suppress the gelation formation.1H-NMR spectra and dual detector size exclusion chromatography proved the hyperbranched structure indisputably, and the degree of branching was determined by the detailed analyses of 1H-NMR spectra. The trend of the degree of branching was in consistent with the result of Mark- Houwink exponent a. The experiment results suggested that the conversion was 67%, Mw = 13.2 x 104, Mark-Houwink a = 0.282 and the degree of branching = 64% when the reaction temperature was 120 ℃, reaction time = 168 h and N,N- ethylidene bis（N-2-chloroacetyl acrylamide）：Cu（I） = 50：0.62.

关键词： Hyperbranched polymers Self-condensing vinyl polymerization Atom transfer radical polymerization High degree of branching water soluble.

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The Preparation of 2-O-Acetonyl-β-cyclodextrin as One Key Intermediate for water soluble.β-Cyclodextrin Derivatives

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Chinese Chemical Letters 2002年第9期13卷 832-835页

作者： AiYouHAO JinShanWANG SchoolofChemistry＆ChemicalEngineering ShangdongUniversityJinan250100 DepartmentofChemistry ShandongNormalUniversityJinan250014

O-Acetonyl-b-cyclodextrin with a suitable average substitution degree of about 5.8, which could be used as a key intermediate for water soluble.functional b-cyclodextrin derivatives, was prepared based on the proper o... 详细信息

关键词： O-Acetonyl-b-cyclodextrin key intermediate water soluble.

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