Effect of re-molding process on material degradation for green plastics of PBS and PLA

在本研究中，绿色塑料的广泛应用和开发再利用方法是主要目的。并对质量的发展进行了结晶和补强成分的尝试。在使用过程中，在质量不下降的情况下，研究了再加工对PBS和PLA力学性能的影响。再处理是将PBS和PLA制成板材，然后将其粉碎成颗粒，然后使用它们再次进行再处理。结果表明，PBS再处理5次后，其强度保持不变。其次，考虑到实际使用过程中质量的退化，制备了热水发生化学降解的材料。浸水引起的降解可以通过后处理得到恢复，但由于水解引起的强度下降没有恢复。研制了一种以黄麻绳为基材，以聚乳酸和PBS为基材的绿色复合材料。该FRP的强度达到了聚碳酸酯水平的发展水平。结果表明，增强纤维对混凝土的蠕变过程有较强的抑制作用。由于所使用的两种聚合物都具有结晶性，所以我们试图通过结晶来控制。当结晶度升高时，力学性能有所改善，但存在一周点。即结晶度高的材料容易发生化学降解。研究了结晶对PBS和PLA蠕变行为的影响。在提高结晶度的过程中，抑制了蠕变行为。同时还发现晶体的晶粒大小对其有影响。关于绿色复合材料再利用的LCA的参考资料已经做了搜索，但是我们没有写最终报告，因为报告不是很多。

In this research, the wide application and the development reuse method of green plastics was main purpose. And the development of quality by crystallization and the composition of reinforcement tried.1. When the quality did not depredate during using process, the effect of reprocessing on mechanical properties of PBS and PLA were researched. The reprocessing was that molding a plate of PBS and PLA, after then crashed it into particles and using them reprocessing again. It was found that the strength of reprocessed PBS kept constant until five times of reprocessing. Next, thinking the degradation of the quality during practical using, the material, which chemical degradation occurred by hot water was prepared. The degradation caused by water immersion was recovered by reprocessing but the decrease on strength caused by hydrolysis did not show recover.2. A green composite material with a jute string and PLA and PBS was developed. The strength of this FRP reached to the purpose of development of level, which was the level of polycarbonate. And it was found that the reinforcement fiber strongly arrested the progress of creep deformation.3. Because used two polymers have crystallinity, we tried to be controlled by crystallization. When the crystallinity risen, mechanical properties were improved but one week point was found. That is the material of high crystallinity easily occurred chemical degradation.4. The effect of crystallization on creep behavior of PBS and PLA has been researched. In creasing the crystallinity, creep behavior was arrested. And also it was found the grain size of crystal affected it.5. Search for reference on LCA for reuse of green composites has been done but we did not write a final report because reports were not so much.