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Anti-shrinking foaming of polyethylene with CO2 as blowing agent
The Journal of Supercritical Fluids ( IF 3.4 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.supflu.2020.104883
Hong Zhang , Tao Liu , Bin Li , Hui Li , Zhihuai Cao , Geng Jin , Ling Zhao , Zhong Xin

Low-density polyethylene (LDPE) foams blown with CO2 typically exhibit severe shrinkage problem and poor surface appearance, which makes them have to be prepared by using hydrocarbon as the blowing agent. In this work, we reported a facile method to prepare LDPE foams with good dimensional stability by simply controlling the linear low-density polyethylene (LLDPE) addition and the dissolved CO2 content. The rheological evaluation and foaming behaviors showed that the LDPE/LLDPE blend with a mass ratio of 90/10 possessed better foamability than LDPE and the blends of other mass ratio did. Moreover, the presence of 10 wt% LLDPE in LDPE matrix could not only facilitate the cell nucleation and the formation of open-cell structure, but also effectively solve the shrinkage problem of LDPE/LLDPE foams blown with CO2. The shrinkage behavior was further analyzed by numerical simulation of dimensional stability, and the simulation results agreed well with the experimental results.



中文翻译:

以CO 2为发泡剂的聚乙烯抗收缩发泡

用CO 2吹制的低密度聚乙烯(LDPE)泡沫通常会出现严重的收缩问题和不良的表面外观,这使得它们必须通过使用烃作为发泡剂来制备。在这项工作中,我们报告了一种通过简单控制线性低密度聚乙烯(LLDPE)的添加量和溶解的CO 2来制备具有良好尺寸稳定性的LDPE泡沫的简便方法内容。流变学评价和发泡行为表明,质量比为90/10的LDPE / LLDPE混合物具有比LDPE更好的发泡性,而其他质量比的混合物则具有更好的发泡性。此外,在LDPE基质中存在10wt%的LLDPE不仅可以促进泡孔成核和开孔结构的形成,而且还可以有效地解决CO 2吹塑的LDPE / LLDPE泡沫的收缩问题。通过尺寸稳定性的数值模拟进一步分析了收缩行为,模拟结果与实验结果吻合良好。

更新日期:2020-05-01
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