期刊
EXPRESS POLYMER LETTERS
卷 8, 期 7, 页码 517-527出版社
BUDAPEST UNIV TECHNOL & ECON
DOI: 10.3144/expresspolymlett.2014.55
关键词
polymer blends and alloys; poly(hydroxybutyrate); poly(ethylene-co-vinyl acetate); miscibility; thermoplastic elastomer
资金
- National Natural Science Foundation of China [51303067, 51173072]
- Natural Science Foundation of Jiangsu Province [BK20130147]
Partially bio-based thermoplastic elastomers (bio-TPE) were designed and prepared by physical blending a commercial grade poly(hydroxyalkanoate)s (PHBM, Metabolix) and poly(ethylene-co-vinyl acetate) (EVA). The PHBM is miscible with EVA90 which has a vinyl acetate (VA) content of 90 wt% while it is not miscible with EVA at low VA content (<= 70 wt%). The PHBM/EVA90 blends exhibit high tensile strength and typical thermoplastic elastomeric characteristics e.g. high elongation at break (> 800%), good strain-recovery (> 60%) and melt processability. The spherulite growth rate of PHBM decreases with increasing EVA90 content. Consequently, a large number of fine PHBM spherulites were formed in the blends. The spherulites act as physical crosslink-points leading to a thermoreversable network in the blends. Such network and elastic EVA90 molecules result in the thermoplastic and elastomeric characteristics of the PHBM/EVA90 blends.
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