文献类型：期刊文献

英文题名：Cellulose Microfibrils Grafted with PBA via Surface-Initiated Atom Transfer Radical Polymerization for Biocomposite Reinforcement

作者：Li, Shuzhao[1,2];Xiao, Miaomiao[1];Zheng, Anna[2];Xiao, Huining[1]

机构：[1]Univ New Brunswick, Dept Chem Engn, Fredericton, NB E3B 5A3, Canada;[2]E China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2011

卷号：12

期号：9

起止页码：3305

外文期刊名：BIOMACROMOLECULES

收录：;EI(收录号：20113814336313);WOS:【SCI-EXPANDED(收录号:WOS:000294699000023)】；

基金：The NSERC Canada and NSERC Green Wood Fiber Network are gratefully acknowledged for financially supporting to this work.

语种：英文

外文关键词：Molecular weight - Grafting (chemical) - Atom transfer radical polymerization - Cellulose - Composite materials

摘要：Immobilizing poly(butyl acrylate) (PBA) on cellulose microfibrils (CMFS) by atom transfer radical polymerization, (ATRP)of butyl acrylate (BA) on the surface of 2-bromoisobutyryl-fundionalfzed CMF generated highly hydrophobic microfibrils (CMF-PBA) with a hard core and a softshell structure. TGA and staic water contact angle results suggested that the surfaces of the Modified CMF samples were not completely covered by PBA chains until the molecular weight of grafts became sufficiently long. The GPC results indicated that the grafts with low molecular weight showed controlled/"living" characteristics of the surface initiated ATRP; however, there existed more side reactions with the increase in molecular weights. Biocomposites consisting of polypropylene (PP) and CMF-PBA samples exhibited significantly improved compatibility, interface adhesion, and mechanical properties with the increase in PBA graft length. The findings confirmed that the longer grafts facilitated the better entanglement of PBA grafts with PP macromolecules and thus further improved the mechanical properties.