Effect of side chain length on structure and thermomechanical properties of fully substituted cellulose fatty esters

被引:135
作者
Crepy, Lucie [1 ,2 ,3 ]
Miri, Valerie [2 ,4 ]
Joly, Nicolas [1 ,2 ,3 ]
Martin, Patrick [1 ,2 ,3 ]
Lefebvre, Jean-Marc [2 ,4 ]
机构
[1] UCCS, UArtois, IUT Bethune, F-62408 Bethune, France
[2] Univ Lille Nord France, F-59000 Lille, France
[3] UCCS, CNRS, UMR 8181, Unite Catalyse & Chim Solide, F-59650 Villeneuve Dascq, France
[4] Univ Lille Nord France, CNRS, UMR 8207, Unite Mat & Transformat, Lille, France
关键词
Cellulose fatty esters; Layered type structure; Side-chain crystallinity; Structure-properties relationships; SEMIFLEXIBLE POLYMERS; MECHANICAL-PROPERTIES; THERMAL-ANALYSIS; PLASTIC FILMS; ESTERIFICATION; TRANSITIONS; DERIVATIVES; CRYSTALLINITY; PERFORMANCE; ACYLATION;
D O I
10.1016/j.carbpol.2010.10.045
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
A series of cellulose esters (CEs) with high degrees of substitution has been obtained by linking aliphatic acid chlorides (from C8 to C18) onto cellulose backbone, in a homogeneous LiCl/DMAc medium. These materials have been characterized by Fourier transformed infra red (FTIR) and nuclear magnetic resonance of proton (H-1 NMR) spectroscopies, as well as differential scanning calorimetry (DSC), wide angle X-ray scattering (WAXS), dynamic mechanical analysis (DMA) and mechanical analyses. CEs organize in a layered type structure: cellulosic backbones are arranged in a plane, the flexible side chains being fully extended and perpendicular to the cellulosic backbone. When the fatty chain length exceeds 12 carbon atoms, a fraction of the alkyl chains crystallize into hexagonal packing. Regarding the mechanical behavior, the strain at break decreases significantly whereas no clear evolution of the yield stress is observed when the length of the lateral chain is increased. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1812 / 1820
页数:9
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