Effects of thermal treatment on the CO2 sorption of triblockcopolymers derived from polyimide and poly(methylmethacrylate) |
| |
Authors: | Shota Ando Akihiro Yoshida Kazukiyo Nagai |
| |
Affiliation: | Department of Applied Chemistry, Meiji University, Kawasaki, Japan |
| |
Abstract: | ABA‐type triblock copolymers were synthesized using 4,4‐(hexafluoroisopropylidene) diphthalic anhydride‐2,3,5,6‐tetramethyl‐1,4‐phenylenediamine (6FDA‐TeMPD) and poly(methyl methacrylate) (PMMA). The films were characterized by determining the effects of different content ratios and thermal decomposition of PMMA block on CO2 sorption properties. TGA results showed that a thermal labile block can be completely decomposed under a previously reported thermal condition. SEM results presented that the asperity was micro‐phase separation caused by the PMMA block content rate. Numerous pores with sizes of approximately 10 to 50 nm were detected on Block(28/72) and Block(10/90). The isotherms of all films fitted the dual‐mode sorption model, and CO2 sorption decreased with increased PMMA content rate. Infinite‐dilution CO2 solubility depended on the Langmuir's site of each polymer because SH0/S0 of PI and Block(PI/PMMA) varied from 0.84 to 0.92 CO2 affinity was increased by thermal treatment as indicated by the higher b and S0 values of thermally treated films than those of nontreated films. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42208. |
| |
Keywords: | copolymers degradation films polyimides radical polymerization |
|
|