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首页> 外文期刊>Journal of Polymers and the Environment >Development of PBT/Recycled-PET Blends and the Influence of Using Chain Extender
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Development of PBT/Recycled-PET Blends and the Influence of Using Chain Extender

机译：PBT /再生PET共混物的开发及使用扩链剂的影响

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摘要

In this study, PBT/recycled-PET blends were developed using a twin-screw extruder. A commercial chain extender (Joncryl ADR 4468) was also used to melt mix with PBT/recycled-PET blend systems. Firstly, Joncryl at different loadings was extruded with recycled-PET to explore the influence of branching on melt behavior and crystallization of PET. The effect of blending recycled-PET with PBT on the final properties was then explored at different blending ratios (25w/75w, 50w/50w and 75w/25w). Similar blends were subsequently prepared while incorporating chain extender. Melt behavior, phase miscibility, crystallization behavior, solid viscoelastic properties, tensile and impact properties of the blends were eventually analyzed using differential scanning calorimeter (DSC), melt flow indexer (MFI), dynamic mechanical analyzer (DMA), and tensile and Izod notched impact testing, respectively. The results showed that the addition of chain extender increased the melt viscosity of PET and at the low contents enhanced the PET's crystallization rate. On the other hand, the blends of PBT/recycled-PET are fully miscible in the amorphous region whereas the crystalline phases are immiscible subsequent to a fast cooling. The PBT and PET molecules could also co-crystallize and be fully miscible in crystalline phases upon slow cooling of the melt. Blending recycled-PET with PBT didn't suppress the tensile properties of PBT, however it could enhance the PBT's ductility and reduce its impact strength. The chain extender didn't influence the mechanical properties much.[GRAPHICS].
机译：在这项研究中，使用双螺杆挤出机开发了PBT /再生PET混合物。商业增链剂（Joncryl ADR 4468）也用于与PBT /再生PET混合体系熔融混合。首先，用再生PET挤出不同含量的Joncryl，以探讨支化对PET熔体行为和结晶的影响。然后研究了在不同的混合比例（25w / 75w，50w / 50w和75w / 25w）下，将再生PET与PBT混合对最终性能的影响。随后在掺入扩链剂的同时制备相似的共混物。最终使用差示扫描量热仪（DSC），熔体流动指数仪（MFI），动态力学分析仪（DMA）以及拉伸和悬臂梁缺口分析了共混物的熔融行为，相溶混性，结晶行为，固体粘弹性，拉伸和冲击性能冲击测试。结果表明，增链剂的加入提高了PET的熔融粘度，低含量时提高了PET的结晶速率。另一方面，PBT /再生PET的共混物在无定形区域中是完全可混溶的，而在快速冷却后，结晶相是不可混溶的。熔融物缓慢冷却后，PBT和PET分子也可能共结晶并在结晶相中完全混溶。将再生PET与PBT混合不会抑制PBT的拉伸性能，但是可以增强PBT的延展性并降低其冲击强度。扩链剂对机械性能的影响不大。[图形]

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