文献类型：期刊文献

英文题名：Effects of ComonomerComposition on Adhesion and FoamingBehavior of Polypropylene Particles during Water-Free SupercriticalCO2 Bead Foaming

作者：Cao, Yulian[1];Peng, Yao[1];Li, Xuwei[1];Wang, Xiaojia[1];Gu, Jiahao[1];Lei, Ke[1];Chen, Yichong[1,2];Hu, Dongdong[1];Zhao, Ling[1,2]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai Key Lab Multiphase Mat Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Shanghai Elect Chem Innovat Inst, Shanghai 201419, Peoples R China

年份：2026

卷号：65

期号：32

起止页码：17436

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20263421344978);Scopus(收录号：2-s2.0-105047835720);WOS:【SCI-EXPANDED(收录号:WOS:001845047500001)】；

基金：This work was supported by the National Natural Science Foundation of China (Grant No. 22308097), the 111 Project (Grant No. B20031), the Fundamental and Interdisciplinary Disciplines Breakthrough Plan of the Ministry of Education of China (JYB2025XDXM407), the Program of China Scholarship Council (Grant No. 202406740023), the Young Elite Scientists Sponsorship Program by CAST (Grant No. 2024QNRC001), and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Adhesion - Carbon dioxide - Granular materials - Molecular structure - Plastic products - Resins - Runway foaming

摘要：Water-free supercritical CO2 bead foaming offers a cleaner route to expanded polypropylene beads, but the absence of water intensifies interparticle adhesion. Four polypropylene resins with different comonomer compositions were investigated to clarify the effects of molecular structure on adhesion and foaming. Compared with homopolypropylene, the comonomer-containing resins showed lower apparent crystallinity, higher CO2 uptake under their respective processing conditions, and different melt responses. Simulations and adhesion measurements indicated that cohesive energy density relates to intrinsic particle adhesion, whereas PP-CO2 interaction energy reflects PP-CO2 affinity. The observed foaming behavior resulted from the combined effects of apparent crystallinity, melt viscoelasticity, CO2 uptake, molecular interactions, and adhesion. The ethylene-propylene copolymer provided the best balance, producing relatively uniform, dense microcellular structures with controlled adhesion. These results guide the selection of polypropylene resins for water-free supercritical CO2 bead foaming.