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

二次成型工艺对 PBS 和 PLA 绿色塑料材料降解的影响

基本信息

批准号：
17560725
负责人：
SOMIYA Satoshi
金额：
$ 2.4万
依托单位：
Keio University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17560725/
关键词：
Circumstance technology Circumstance materials Structure of polymer Reprocessing of Waste Biodegradable polymer Green Composite Reuse 廃棄物際資源化

项目摘要

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.

本研究以绿色塑料的广泛应用和开发再利用方法为主要目的。并通过结晶质量的发展和增强剂的组成进行了试验.在使用过程中质量不下降的情况下，研究了后处理对PBS和PLA力学性能的影响。再加工是将PBS和PLA的平板成型，然后将其粉碎成颗粒并再次使用它们进行再加工。结果发现，再处理的PBS的强度保持恒定，直到再处理5次。其次，考虑到在实际使用过程中质量的劣化，制备了在热水中发生化学降解的材料。水浸泡引起的降解通过再加工可以恢复，但水解引起的强度下降没有恢复.研制了一种以黄麻纤维为基体、聚乳酸（PLA）和磷酸盐缓冲液（PBS）为基体的绿色复合材料。该玻璃钢的强度达到了开发水平的目的，即聚碳酸酯的水平。研究发现，增强纤维对蠕变变形的发展有很强的抑制作用.由于所用的两种聚合物都具有结晶性，我们试图通过结晶来控制。随着结晶度的提高，材料的力学性能有所提高，但存在一个“弱点”，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。随着结晶度的增加，蠕变行为得到抑制。同时还发现晶体的晶粒尺寸对其有影响.关于绿色复合材料再利用的LCA的参考文献已经完成，但我们没有写最终报告，因为报告不多。