High temperature properties of poly(styrene-co-alkylmaleimide) foams prepared by high internal phase emulsion polymerization

被引:30
作者
Duke, JR
Hoisington, MA
Langlois, DA
Benicewicz, BC
机构
[1] Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, Polymers & Coatings Grp, Los Alamos, NM 87545 USA
[2] 3M Austin Ctr, Austin, TX 78726 USA
[3] Rensselaer Polytech Inst, Dept Chem, Troy, NY 12180 USA
关键词
foams; high internal phase emulsion; styrene;
D O I
10.1016/S0032-3861(98)00115-3
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The influence of three N-substituted maleimides on the processing, thermal, and mechanical performance of high internal phase emulsion (HIPE) polymerized foams are investigated. N-propylmaleimide, N-butylmaleimide, and N-cyclohexylmaleimide were copolymerized with styrene and crosslinked with either divinylbenzene or bis(3-ethyl-5-methyl-4-maleimide-phenyl)methane in a HIPE polymerization process. The foam samples were evaluated by dynamic mechanical analysis, thermogravimetric analysis, compression strength measurements, and scanning electron microscopy. All maleimide modifiers produced increases in the foam glass transition temperature (T-g) as a function of the maleimide concentration. However, the degree of T-g improvement was strongly dependent on the N-substituted maleimide used during processing. Cyclohexylmaleimide produced higher T-g foams than propylmaleimide, which produced higher T-g foams than butylmaleimide. In addition, the N-substituted maleimide solubility in both the oil and water phases played important roles in the processing and final open-celled microstructure. The preferred N-substituted maleimide modifier should possess high solubility in the oil phase and insolubility in the water phase. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:4369 / 4378
页数:10
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