THE EFFECT OF BLENDING HIGH-DENSITY AND LINEAR LOW-DENSITY POLYETHYLENES ON SLOW CRACK-GROWTH

POLYMER

卷:34

Article

ZHOU, ZQ ; LU, XC ; BROWN, N

关键词: HIGH-DENSITY POLYETHYLENE;    LINEAR LOW-DENSITY POLYETHYLENE;    BLEND;    SLOW CRACK GROWTH;    NETWORK;   

DOI  :  10.1016/0032-3861(93)90582-U

来源: Elsevier

【 摘 要 】

A high-density polyethylene (HDPE) homopolymer was blended with a linear low-density polyethylene (LLDPE), i.e. an ethylene-hexene copolymer, over the composition range of 0-100%. The resistance to slow crack growth was measured by a notched tensile test under a constant load. The times to failure increased from about 10(2) min to 10(8) min as the composition increased from 0 to 100% of the copolymer. In the range of compositions below 50% of the copolymer, the time to failure increased relatively slowly with composition compared to the very rapid rate of increase for compositions greater than 50% of the copolymer. The results were explained in terms of a network formed by the crystals and tie molecules that contained short-chain branches. The network becomes continuous when the copolymer is the major component and consequently the resistance to slow crack growth increases rapidly.

【 授权许可】

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