科研之友
微信
新浪微博
Facebook
分享链接
摘要
Recycled plastics are considered to have worse mechanical stability and less durability. Usually, the reason for above phenomena was thought to be caused by chemical degradation. However, we recently found that pre-consumer polypropylene was not chemically degraded and had almost the same molecular properties as virgin polypropylene. But the inner structure of virgin and recycled samples are very different (virgin: very smooth, recycled: very rough), and the mechanical properties of thin films are also very different (virgin: ductile, recycled: brittle). From the UV degradation properties, we had concluded that the difference of the mechanical properties had come from the difference in number of adhesion sustaining molecules that connect the grains (crystals of polypropylene). This result suggests that, if we can increase the number of the adhesion sustaining molecules, we can improve the mechanical properties and the durability of recycled polypropylene. In this time, we applied various thermal treatments for recycled pre-consumer polypropylene and found that we could obtain properties similar to virgin polypropylene. These methods are thought to be a promising way for successful recycling plastics.
- 出版日期2013
