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题名: Cellulose Dissolution and InSitu Grafting in a Reversible System using an Organocatalyst and Carbon Dioxide
作者: Song, Longchu1, 2;  Yang, Yunlong1, 2;  Xie, Haibo2, 3;  Liu, Enhui1
关键词: carbon dioxide ;  celluloses ;  organocatalysis ;  ring-opening polymerization ;  sustainable chemistry
刊名: CHEMSUSCHEM
发表日期: 2015-10-12
DOI: 10.1002/cssc.201500378
卷: 8, 期:19, 页:3217-3221
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Multidisciplinary
研究领域[WOS]: Chemistry
英文摘要: Cellulose is a promising renewable material, but cannot easily be processed homogeneously owing to the stiffness of the molecules and the dense packing of its chains, due to intermolecular hydrogen bonds. Cellulose processability can be improved by chemical modification. The reversible reaction of cellulose with carbon dioxide in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) allows dissolution of cellulose in dimethyl sulfoxide (DMSO). This DMSO solution is an effective medium for grafting l-lactide (LLA) from cellulose by ring-opening polymerization (ROP) under mild conditions, allowing to prepare cellulose-graft-poly(l-lactide) co-polymers with a molar substitution (MSPLLA) of poly(l-lactide) in the range of 0.37-5.32, at 80 degrees C. This makes DBU not only an important reagent to achieve cellulose dissolution, but it also acts as organocatalyst for the subsequent ring-opening polymerization process. Characterization of the structure and thermal properties of the co-polymers by a variety of techniques reveals that they have a single glass-transition temperature (T-g), which decreases with increasing MSPLLA. Thus, the modification results in a transformation of the originally semirigid cellulose into a thermoplastic material with tunable T-g. The carbon dioxide dissolution strategy is an efficient platform for cellulose derivatization by homogeneous organocatalysis.
关键词[WOS]: RING-OPENING POLYMERIZATION ;  IONIC LIQUIDS ;  RADICAL POLYMERIZATION ;  COPOLYMERS ;  NANOMICELLES ;  SURFACTANTS ;  LACTIDE ;  CO2
语种: 英语
WOS记录号: WOS:000362729800005
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/146596
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Xiangtan Univ, Coll Chem, Minist Educ, Key Lab Environm Friendly Chem & Applicat, Xiangtan, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, Dalian 116023, Peoples R China
3.Guizhou Univ, Dept Polymer Mat & Engn, Coll Mat & Met, Guiyang 550025, Peoples R China

Recommended Citation:
Song, Longchu,Yang, Yunlong,Xie, Haibo,et al. Cellulose Dissolution and InSitu Grafting in a Reversible System using an Organocatalyst and Carbon Dioxide[J]. CHEMSUSCHEM,2015,8(19):3217-3221.
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