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Subsequent but Independent Cavitation Processes in Isotactic Polypropylene during Stretching at Small- and Large-Strain Regimes
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-06-28 , DOI: 10.1021/acs.iecr.8b01650
Dong Lyu 1, 2 , Ran Chen 1 , Ying Lu 1 , Yongfeng Men 1, 2
Affiliation  

Isotactic polypropylene (iPP) samples with different molecular weights were used to investigate the relationship between cavitation processes triggered at small- and large-strain regimes. The cavitation triggered at large strains was observed in all deformation cases regardless of the occurrence of cavitation activated at small strain. The initiation of the large-strain-cavitation process required a critical stress, which was mainly determined by the molecular weight of iPP, because it was a result of the disentanglement of the highly oriented amorphous network initiated by the breakage of interfibrillar load-bearing tie chains. In general, iPP with higher molecular weight required a higher critical stress to trigger this cavitation and presented more intensive whitening. However, the intensity of cavitation activated at small strains decreased with increasing iPP molecular weight. The cavities generated at small strain are therefore supposed to have no contribution to the cavitation initiated at large strain.

中文翻译:

在小应变和大应变状态下拉伸过程中等规聚丙烯的后续但独立的空化过程

使用具有不同分子量的等规聚丙烯(iPP)样品研究在小应变和大应变状态下触发的空化过程之间的关系。在所有变形情况下均观察到在大应变下触发的空化,而与在小应变下激活的空化无关。大应变空化过程的开始需要一个临界应力,该应力主要由iPP的分子量决定,因为这是由于纤维间承重带断裂引起的高取向非晶态网络解缠的结果链。通常,具有较高分子量的iPP需要较高的临界应力才能触发这种空化作用,并呈现出更强烈的增白效果。然而,随着iPP分子量的增加,在小菌株下激活的空化强度降低。因此,假定在小应变下产生的空洞对在大应变下产生的空化没有贡献。
更新日期:2018-06-30
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