Research on slow crack growth resistance of polyethylene pipe based on strain hardening modulus,Journal of Vinyl and Additive Technology

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Research on slow crack growth resistance of polyethylene pipe based on strain hardening modulus
Journal of Vinyl and Additive Technology ( IF 3.8 ) Pub Date : 2021-12-08 , DOI: 10.1002/vnl.21885
Ying Zhang ₁ , Aimin Xiang ₁ , Xiaoying Lu ₂ , Hongfu Zhou ₁ , Duoyuan Yin ₃ , Huafeng Tian ₁

Affiliation

Slow crack growth (SCG) is the principal factor for determining the operating lifetime of polyethylene (PE) pipes. Exploring the relationship between the molecular structure and the strain hardening (SH) modulus is helpful to evaluate the SCG resistance of PE pipe materials accurately. This paper uses an efficient SH test method to study the SH modulus for four kinds of PE pipes. Meanwhile, the correlation between SH modulus and sample thickness, material crystallinity (X_c), comonomer type and content, weight-average molecular weight, and molecular weight distribution has been established and investigated respectively. The results represent that the comonomer type and the X_c of PE materials played significant roles in the SH modulus. The SH modulus of ethylene-hexene copolymer is 5–7 MPa higher than that of ethylene-butene copolymer. The amount in the range of 1 × 10³ to 1 × 10⁵ of the molecular weight distribution of PE materials has a significant contribution to the establishment of the tie molecular network. In addition, the higher X_c and the thinner thickness were beneficial to obtain the higher measured SH modulus.

中文翻译：

基于应变硬化模量的聚乙烯管材抗慢速裂纹扩展研究

缓慢的裂纹扩展 (SCG) 是决定聚乙烯 (PE) 管道使用寿命的主要因素。探索分子结构与应变硬化(SH)模量之间的关系有助于准确评估PE管材的抗SCG性能。本文采用一种高效的 SH 测试方法研究了四种 PE 管材的 SH 模量。同时，分别建立并研究了SH模量与样品厚度、材料结晶度（X _c）、共聚单体类型和含量、重均分子量和分子量分布的相关性。结果表明共聚单体类型和 X _cPE 材料在 SH 模量中起重要作用。乙烯-己烯共聚物的SH模量比乙烯-丁烯共聚物高5-7 MPa。PE材料的分子量分布在1×10 ³到1×10 ^{5范围内的量对连接分子网络的建立有显着贡献。}此外，更高的 X _c和更薄的厚度有利于获得更高的测量 SH 模量。

更新日期：2021-12-08

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