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Healing phenomenon adapted to understand the miscibility of polymer blends: An approach based on the deformation mechanism
Journal of Applied Polymer Science ( IF 3 ) Pub Date : 2020-06-29 , DOI: 10.1002/app.49604
Eder H. C. Ferreira 1 , Guilhermino J. M. Fechine 1
Affiliation  

Following many years of studies on polyethylene blends, several indirect classical experimental methods (DSC, XRD, DMA, cryogen fracture surface using SEM, and Rheological Test in Oscillatory Flow) have been used to evaluate the compatibility between polyethylene blends. Here a study of a high‐density polyethylene (HDPE)—ultrahigh molecular weight polyethylene (UHMWPE) system, which evidences that the compatibility of mixtures using these experimental methods does not assure good mechanical performance of the blends. In addition, the potential that these blends can perform mechanically may be overestimated. Based on the theory of healing at a polymer‐polymer interface, it was shown that the maximum mechanical performance of the HDPE‐UHMWPE blend can be obtained for long time molecular diffusion when the mixtures equilibrium (maximum mixing degree) at the HDPE‐UHMWPE interphase is achieved. The degree of mixture at the HDPE‐UHMWPE interphase was assessed indirectly by the deformation mechanism that each phase and the interphase plays during the tensile test (at solid state). The advances reported in this paper can contribute to understanding the mechanical performance of different systems formed by compatible polyethylene blends.

中文翻译:

适应于理解聚合物共混物的修复现象:一种基于变形机制的方法

在对聚乙烯共混物进行了多年研究之后,几种间接的经典实验方法(DSC,XRD,DMA,使用SEM的致冷剂断裂表面以及“振荡流动流变测试”)已用于评估聚乙烯共混物之间的相容性。在此对高密度聚乙烯(HDPE)-超高分子量聚乙烯(UHMWPE)系统进行的研究表明,采用这些实验方法的混合物的相容性不能确保混合物的良好机械性能。此外,可能会高估了这些共混物可机械发挥的潜力。根据聚合物-聚合物界面处的愈合理论结果表明,当在HDPE-UHMWPE相间达到混合物平衡(最大混合度)时,HDPE-UHMWPE共混物可在长时间的分子扩散中获得最大的机械性能。HDPE-UHMWPE相间的混合程度是通过拉伸试验(固态)下各相和相间所起的变形机制间接评估的。本文报道的进展可有助于理解由相容的聚乙烯共混物形成的不同体系的机械性能。
更新日期:2020-07-07
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