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Solid-phase photodegradation of polystyrene by nano TiO2 under ultraviolet…
1. Introduction
- Burning polystyrene debris is not an appropriate solution for their eradication because during the ignition process, many harmful gases which include certain reactive radical specious are evolved. These gases may cause suffocation and many sorts of disease to the creatures consuming them. They may also be carcinogenic.
- analysed at regular intervals of 500 h
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5. Preparation of PS and PS-TiO2 composites for determination of mechanical properties and electrical properties
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- Mz(Z均分子量) > Mw(重量平均分子量) > Mv(黏度平均分子量) > Mn(數目平均分子量)，Mv略低於Mw
- Mn靠近聚合物中低分子量的部分，即低分子量部分對 ，即低分子量部分對Mn影響較大
- Mw靠近聚合物中高分子量的部分，即高分子量部分對 ，即高分子量部分對Mw影響較大
- 一般用Mw來表徵聚合物比Mn更恰當，因為聚合物的性能如 ，因為聚合物的性能如强度、熔體粘度更多地依賴於樣品中較大的分子
- 以分子量分佈指數表示，即重量平均分子量與數目平均分子量的比值，Mw / Mn=PDI
PDI=1:分子量均一分佈
PDI接近1(1.5~2):分子量分佈較窄
PDI遠離1(20~50):分子量分佈較寬