文献类型：期刊文献

英文题名：Evaluating melt foamability of LLDPE/LDPE blends with high LLDPE content by bubble coalescence mechanism

作者：Zhang, Hong[1];Liu, Tao[1];Li, Bin[2];Li, Hui[2];Cao, Zhihuai[3];Jin, Geng[3];Zhao, Ling[1];Xin, Zhong[1]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Multiphase Mat Chem Engn, Shanghai 200237, Peoples R China;[2]Donghua Univ, Ctr Adv Low Dimens Mat, Shanghai 201620, Peoples R China;[3]Innovo Packaging Shanghai Co Ltd, Shanghai, Peoples R China

年份：2021

卷号：213

外文期刊名：POLYMER

收录：;EI(收录号：20204709521171);WOS:【SCI-EXPANDED(收录号:WOS:000608415000005)】；

基金：This work was supported by the National Key Research and Development Program of China (2016YFB0302200).

语种：英文

外文关键词：Bubble coalescence; Foamability; LLDPE/LDPE blends

摘要：Bubble coalescence mechanism was introduced to evaluate the melt foamability of polymer blends. Linear low-density polyethylene (LLDPE), with excellent mechanical properties but poor foamability, was blended with small amounts of low-density polyethylene (LDPE), which was expected to impart the desired foaming-related properties to LLDPE. The presence of LDPE in LLDPE matrix provided only a small improvement in linear viscoelasticity under small deformations, but a significantly large improvement in nonlinear behavior under large deformations. A critical coalescence radius curve was simulated using a pressure-balanced bubble growth model to evaluate bubble coalescence and foamability of the blends, taking into account the linear and non-linear behaviors. It was found that the steep stress growth caused by LDPE addition can dramatically increase the pressure of large bubbles and then effectively inhibit the coalescence of adjacent bubbles, thus improving the foamability of LLDPE/LDPE blends. The theoretical predictions derived from the bubble coalescence mechanism were also confirmed by experiments.