聚乙二醇
聚合
聚合物
化学工程
PEG比率
试剂
溶剂
两亲性
材料科学
微波食品加热
脱水
化学
高分子化学
有机化学
共聚物
经济
工程类
物理
量子力学
生物化学
财务
作者
Ioanna Tzortzi,Christos Xiouras,Chrysovalantis Tserpes,Andromachi Tzani,Anastasia Detsi,Tom Van Gerven,Georgios D. Stefanidis
标识
DOI:10.1016/j.cep.2023.109315
摘要
Hydrophobically modified ethoxylated urethanes (HEURs) are among the most widely studied class of waterborne polyurethanes. HEURs are amphiphilic polymers that are usually composed of a polyethylene glycol (PEG) backbone, typically end-capped with aliphatic alkyl chains. HEUR synthesis in the industry is a slow and energy-intensive step-growth polymerization process, due to heat and mass transfer limitations inherent in such highly viscous systems. We investigate for the first time the effect of microwave heating on both the solvent-free HEUR synthesis step and the initial pretreatment step of the reagents prior to the HEUR synthesis. We show that microwaves can drastically reduce the overall processing time, and thereby reduce total energy consumption by: A) faster melting of solid PEG and B) faster completion of the polymerization reaction, when operating with a novel rapidly rising transient temperature profile that cannot be reproduced by conventional heating. However, it was found that PEG pretreatment/dehydration by microwaves leads to faster degradation of PEG, compared to dehydration by conventional heating at the same bulk temperature, and should therefore be avoided.
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