Effect of aging on the mechanical properties of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)

被引:68
作者
Alata, Hexig
Aoyama, Taizo
Inoue, Yoshio
机构
[1] Tokyo Inst Technol, Dept Biomol Engn, Midori Ku, Yokohama, Kanagawa 2268501, Japan
[2] Kaneka Corp, Res & Dev Grp, Performance Polymer Div, Settsu, Osaka 5660072, Japan
关键词
D O I
10.1021/ma070418i
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The effect of aging on the mechanical properties was investigated for a series of bacterial copolyester poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) [P(3HB-co-3HH)] with 3HH molar fraction ranging from 5 to 18 mol %. The mechanism behind the aging phenomenon was studied by using gel permeation chromatography (GPC), differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD), and small-angle X-ray scattering (SAXS) in parallel to the tensile testing. It was found that the high initial crystallinity and the narrower amorphous region in the P(3HB-co-3HH) films are the key factors that cause the secondary crystallization in the aging process to embrittle the films of copolymers with 3HH fraction lower than 10 mol %. For the copolymers with 3HH fractions higher than 10 mol %, because of the intrinsically lower crystallinity and thicker amorphous region, the secondary crystallization cannot affect the mechanical properties significantly.
引用
收藏
页码:4546 / 4551
页数:6
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