writer：Jun Yang, Fushi Li, Chong Guan, Xiangming Xu, Lin Zhong, Yunbao Gao, Nan Yan, Jing Jin, Guiyan Zhao, Wei Jiang
keywords：HDPE, 弹性体, 增韧, 脆韧转变, 模量
source：期刊
specific source：Journal of Polymer Research, 2022, 29(5), 173
Issue time：2022年

摘要：弹性体增韧高密度聚乙烯（HDPE）在低温下的抗冲击性由其脆韧转变温度（TBD）决定。继前期关于HDPE分子量对POE增韧HDPE脆韧转变影响的工作后，本文研究了弹性体模量的影响，因为基体聚合物与弹性体模量比在脆韧转变中起重要作用。采用四种不同玻璃化转变温度（Tg）的弹性体，通过动态力学分析分别获得HDPE与弹性体的模量比，并在不同温度下测试HDPE共混物的缺口冲击强度。结果表明，当温度升高使HDPE与弹性体模量比达到10时，缺口冲击强度出现明显尖锐转变，表明当HDPE与弹性体模量比小于10时HDPE不能有效增韧。这是首次在实验中定量给出弹性体增韧热塑性聚合物的脆韧转变效应。此外，结果表明为获得弹性体增韧HDPE的较低TBD，弹性体Tg必须足够低。

Abstract：Impact resistance for elastomer toughened high density polyethylene (HDPE) at low temperature was determined by its brittle-ductile transition temperature (TBD). Following our previous work, we studied the effect of elastomer modulus because the modulus ratio of matrix polymer to elastomer plays an important role in brittle-ductile transition. In this study, four elastomers with different glass transition temperatures (Tg) were employed. The modulus ratios of the HDPE to the elastomers were obtained by dynamic mechanical analysis (DMA) measurement, respectively. The notched impact strengths for the HDPE blends with different elastomers were tested at various temperatures. The results showed that the notched impact strength appeared a clear sharp transition when the modulus ratio of the HDPE to elastomer reached 10 by increasing temperature, indicating that the HDPE could not be toughened effectively when the modulus ratio of the HDPE to elastomer is smaller than 10. This is the first time to quantitatively give the effect of elastomer toughened thermal plastic polymers on the brittle-ductile transition in experiment. Moreover, the result directly indicated that the Tg of elastomer must be low enough in order to obtain lower TBD of elastomer toughened HDPE.

论文链接：https://doi.org/10.1007/s10965-022-03027-0