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Polyurethane foaming with CO 2 adducts from C 8 alkyl grafted polyethyleneimines: Optimization of the grafting rate and application of the blowing agents
Author(s) -
Da Xiang,
Liu Chao,
Long Yuanzhu,
Xie Xingyi
Publication year - 2020
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.48752
Subject(s) - blowing agent , polyol , polyurethane , alkyl , polyethylenimine , materials science , grafting , adduct , polymer chemistry , alkylation , foaming agent , chemical engineering , polymer , organic chemistry , chemistry , composite material , catalysis , transfection , biochemistry , engineering , gene , porosity
ABSTRACT We previously explored a series of CO 2 adducts from alkylated polyethylenimines with C 4 to C 16 alkyl side chains, serving as climate‐friendly blowing agents for polyurethanes (PUs). Among them, the polyethylenimine with C 8 alkyl (2‐ethylhexyl) side chains demonstrated the highest foaming efficiency. In this study, we further changed the grafting rate of the C 8 alkyl, from 7 to 16%, and investigated the effects of the resulting blowing agents on the foaming process. For both foaming systems containing a castor oil‐derived polyol (Polycin T‐400) or a poly(propylene glycol) polyol (Polyether 4110), the CO 2 adducts with a grafting rate of 13% displayed the best foaming performance in terms of high dispersibility in the foaming systems, homogenous cellular morphology, and good mechanical properties. Moreover, the 13%‐C 8 ‐alkylated blowing agent demonstrated high suitability for the foaming systems from biomass‐sourced polyols (like Polycin T‐400). Therefore, the optimized CO 2 ‐adduct blowing agent could replace the currently used climate‐changing hydrochlorofluorocarbons and hydrofluorocarbons, as well as might contribute to the development of future renewable PU foams. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48752.