Blends of ethylene- co -vinyl acetate and poly(3-hydroxybutyrate) with adhesion property

eXPRESS Polymer Letters

A. de Lucas-Freile¹ 

关键词: polymer blends and alloys;    adhesion;    ethylene-co-vinyl acetate;    poly(3-hydroxybutyrate);    tack;   

DOI  :  10.3144/expresspolymlett.2018.51

学科分类：生物科学（综合）

来源: eXPRESS Polymer Letters

【 摘 要 】

The structure and properties of ethylene-co-vinyl acetate (EVA) and poly(3-hydroxybutyrate) (PHB) blends dependedon their PHB content, i.e. PHB phase dominated the structure for amounts of PHB higher than 50 wt%, whereasEVA phase is dominant for PHB content lower than 50 wt%. EVA/PHB (70:30) blend showed unexpected different structurebecause of higher miscibility and the creation of new interfacial interactions between C=O and CH3 groups of PHB andCH3 and C=O groups of EVA, these interactions led changing of the phase structure of ethylene and vinyl acetate domainsin EVA. As a consequence, improved thermal, viscoelastic and morphological properties were obtained. EVA+PHB blendscontaining 60 wt% or more PHB did not show tack and, interestingly, the addition of 20–30 wt% PHB enhanced the tackand displaced the maximum tack of pure EVA to lower temperature. The tack of EVA/PHB (70:30) blend was the highestamong all blends because of its particular structure, fibrillation was also shown. Finally, the adhesion of EVA+PHB blendscontaining 20–30 wt% PHB to polypropylene (PP) substrate was higher than the one of pure EVA because of the interactionsbetween the ethylene domains in EVA phase of the blend and PP substrate surface.

【 授权许可】

CC BY