Strain-induced mesophase and hard-elastic behaviour of biodegradable polyhydroxyalkanoates fibers

被引:36
作者
Antipov, E. M.
Dubinsky, V. A.
Rebrov, A. V.
Nekrasov, Yu. P.
Gordeev, S. A.
Ungar, G.
机构
[1] Russian Acad Sci, AV Topchiev Petrochem Synth Inst, Moscow 119991, Russia
[2] Univ Sheffield, Dept Mat Engn, Sheffield S1 3JD, S Yorkshire, England
基金
俄罗斯基础研究基金会;
关键词
biodegradable polyhydroxyalkanoates fibers; structure; properties;
D O I
10.1016/j.polymer.2005.04.111
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Structure, phase transitions and mechanical properties of fibers of biodegradable bacterial polyester poly(beta-hydroxybutyrate) and its random copolymers, prepared by gel-spinning and multistage melt-extrusion, were studied by X-ray diffraction, DSC and mechanical testing. It was found for the first time that as-spun fibers of the homopolymer display pronounced hard-elasticity. They exhibit reversible recovery of sample dimensions on loading and unloading, a behavior typical of hard-elastic fibers. It was also observed that elastic drawing leads to reversible formation of the strain-induced columnar mesophase with a 2D pseudohexagonal arrangement of conformationally disordered chains in addition to the orthorhombic crystalline and amorphous phases of the initial material. In contrast, binary and ternary random copolymers based on poly(beta-hydroxybutyrate), being still crystallizable in spite of having relatively high comonomer content, behave like rubbers rather than true thermoplastics. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码:5678 / 5690
页数:13
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