Analysis of thermomechanical reprocessing effects on polypropylene/ethylene octene copolymer blends
Analysis of thermomechanical reprocessing effects on polypropylene/ethylene octene copolymer blends
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DOI：
10.1016/j.polymdegradstab.2012.05.005
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发表时间：
2012-08-01
影响因子：
5.9
通讯作者：
Muller, Rene
中科院分区：
文献类型：
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作者：
Wang, Kui;Addiego, Frederic;Muller, Rene
研究了研磨回收和再挤出对聚丙烯（PP）/乙烯辛烯共聚物（EOC）共混物物理机械性能的影响。所考虑的EOC含量为Owt. %、IOwt. %和20 wt. %，并且所研究的再循环道次（挤出）的数目为0、1、3和6。最多6次再挤出，注意到熔体流动指数（MFI）增加，结晶度略微增加，分解温度（T-起始）略微降低，并且没有显著的氧化。因此，共混物的再循环通过断链诱导热机械降解而不氧化。随着EOC含量的增加，PP共混物的MFI和T起始温度均增加。第一次回收程序引起的杨氏模量和拉伸屈服应力的增加，而对于较高的回收次数，这两个参数下降。EOC夹杂物稳定的拉伸断裂伸长率高达3个回收程序，由于其尺寸的减少和其形状的均匀化，而纯PP的连续下降与回收次数。(C)2012爱思唯尔有限公司保留所有权利。
The impact of recycling by grinding and re-extrusion on the physical and mechanical properties of polypropylene (PP)/ethylene octene copolymer (EOC) blends was investigated. The considered EOC content was 0 wt. %, 10 wt. % and 20 wt. %, and the investigated number of recycling passes (extrusions) was 0, 1, 3 and 6. Up to 6 re-extrusions, an increase of the melt flow index (MFI), a slight increase of the crystallinity, a slight decrease of the decomposition temperature (T-onset), and no significant oxidation were noted. Therefore, the recycling of the blends induces thermomechanical degradation by chain scission without oxidation. Increasing the content of EOC increases the MFI and the T-onset of the PP blends. The first recycling procedure induced an increase of the Young's modulus and tensile yield stress, while for higher recycling numbers, these two parameters dropped. The EOC inclusions stabilized the tensile elongation at break up to 3 recycling procedures due to a decrease of their size and a homogenization of their shape, while that of neat PP continuously decreased with recycling numbers. (C) 2012 Elsevier Ltd. All rights reserved.