当前位置: X-MOL 学术J. Polym. Environ. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Influence of Chain Extension and Blending on Crystallinity and Morphological Behavior of Recycled-PET/Ethylene Vinyl Acetate Blends
Journal of Polymers and the Environment ( IF 5.3 ) Pub Date : 2020-03-20 , DOI: 10.1007/s10924-020-01699-7
Sajjad Moghanlou , Mahdi Khamseh , Mirkarim Razavi Aghjeh , Behzad Pourabbas

Polyethylene terephthalate (PET) recycling is investigated in this work. PET is a polymer in which hydrolytic degradation of polymeric chains occurs during thermomechanical reprocessing. This kind of processing yields poor melt strength and low viscosity for recycled polyethylene terephthalate (RPET). The chain extension effect of pyromellitic dianhydride (PMDA) on phase morphology and crystallinity of the RPET and polyethylene vinyl acetate (EVA) blends is verified or the first time including crystallization, thermal behavior and morphologies of the blended samples. First, RPET/EVA blends were prepared with 90/10, 70/30 and 60/40 weight ratio in an internal mixer. Pure RPET and virgin PET (VPET) were also reprocessed for comparison. Samples of RPET/EVA, VPET/EVA, RPET/EVA/PMDA and VPET/EVA/PMDA were examined using RPET (or VPET)/EVA = 60/40 (w/w) and 0.5% for PMDA. Both XRD and DSC tests revealed that PMDA and EVA reduce the rate and degree of crystallinity in PET, however, PMDA and PET increase both rate and degree of crystallinity in EVA. SEM images also illustrated RPET/EVA blend to be in co-continuous morphology while adding 0.5 wt% PMDA to the blend changes the structure to microfibrillar matrix-disperse state.



中文翻译:

扩链和共混对再生PET /乙烯醋酸乙烯酯共混物结晶度和形态学行为的影响

这项工作研究了聚对苯二甲酸乙二醇酯(PET)的回收利用。PET是一种聚合物,其中在热机械后处理过程中会发生聚合物链的水解降解。对于回收的聚对苯二甲酸乙二酯(RPET),这种处理方法的熔体强度差,粘度低。均苯四甲酸二酐(PMDA)对RPET和聚乙烯乙酸乙烯酯(EVA)共混物的相形态和结晶度的扩链作用得到了验证,或者首次包括了共混样品的结晶,热行为和形态。首先,在内部混合器中以90 / 10、70 / 30和60/40的重量比制备RPET / EVA共混物。还对纯RPET和纯PET(VPET)进行了处理以进行比较。RPET / EVA,VPET / EVA,使用RPET(或VPET)/ EVA = 60/40(w / w)和0.5%的PMDA检查RPET / EVA / PMDA和VPET / EVA / PMDA。XRD和DSC测试均显示PMDA和EVA降低了PET的结晶速率和结晶度,但是PMDA和PET均提高了EVA的结晶速率和结晶度。SEM图像还说明了RPET / EVA共混物处于共连续形态,同时向该共混物中添加0.5wt%的PMDA将结构改变为微原纤维基质分散状态。

更新日期:2020-04-21
down
wechat
bug