Gas transport and optical properties of ABA-type triblock copolymers designed using fluorine-containing polyimide macroinitiators with methyl methacrylate

Abstract

Abstract4,4'-(Hexafluoroisopropylidene) diphthalic anhydride 2,3,5,6-tetramethyl-1,4-phenylenediamine (6FDA-TeMPD) polyimide macroinitiator was synthesized and reacted with poly(methyl methacrylate) (PMMA) to form an ABA-type triblock copolymer by atom transfer radical polymerization. The effect of the ABA-type triblock copolymer structure on solid, thermal, optical and gas transport properties was systematically investigated and compared with the physical blend polymer. The blend polymer was cloudy, whereas the triblock copolymer was colorless and transparent. The PMMA component decomposition temperature for the triblock copolymer slightly shifted to higher temperature, while its gas barrier property was higher than the blend polymer. The refractive index and the gas permeability decreased while maintaining the heat resistance by a high nanoscale distribution of both polymer components. The 6FDA-TeMPD/PMMA ABA-type triblock copolymer can be described as a polymer material with high heat resistance, high gas barrier property and low refractive index amongst existing polymers.

Synthesis and gas permeability of ABA-type triblock copolymers derived from fluorine-containing polyimide with polyhedral oligomeric silsesquioxane

“…The use of ABA‐type triblock copolymers for functionalizing polymers was reported in a previous study . ABA‐type triblock copolymers present high dispersion among their components.…”

“…Polycarbonates, polysulfones and polyimides (PIs) have attracted significant research attention as film‐based CO 2 separation materials, and aromatic PIs exhibiting excellent thermal resistance, durability and gas separation performance have been investigated for their potential applications. 4,4'‐(Hexafluoroisopropylidene)diphthalicanhydride (6FDA) based PI composed of 2,3,5,6‐tetramethyl‐1,4‐phenylenediamine (TeMPD), in particular, shows high gas permeability because of the bulky CF 3 group of 6FDA and the tetramethyl group of TeMPD.…”

Photoelectric properties of ABA‐type triblock copolymers designed using fluorine‐containing polyimide macroinitiators with polyhedral oligomeric silsesquioxane

“…6FDA‐TeMPD (MEPOSS content 0 mol%) , poly(MEPOSS) (MEPOSS content 100 mol%) , and various 6FDA‐TeMPD/MEPOSS triblock copolymers (MEPOSS content 17, 43, and 79 mol%) were synthesized according to the literature procedure. 1 H NMR (JNM‐ECA500; JEOL Ltd., Tokyo, Japan) and Fourier transform infrared (FTIR) spectroscopy (FT‐IR 460+; JASCO Co., Tokyo, Japan) analyses confirmed the chemical structures of these polymers, as shown in Fig.…”

“…ATRP is an in situ method that allows good control of both the molecular weight and molecular distribution. Additionally, ATRP is the free‐living radical polymerization method most commonly used for polymerizing a wide range of monomers under mild reaction conditions . Therefore, the ABA‐type triblock copolymer was expected to possess a structure with nanoscale phase separation and to produce a transparent film for high dispersion over the visible light region.…”

Photo-Alignment Characteristics of Charge-Transfer Complexes Forming Polyimides with Tetramethyl Phenylene Diamine

“…This behavior is known to form charge-transfer complexes (CTCs) or CT interaction in a polyimide. The CTCs are formed between the polymer chains in the 6FDA-TeMPD polyimide [1,2,5,6]. Based on our previous study, we theorized that the CT interaction between the polymer segments strongly depended on the photo reaction caused by the LPUV irradiation.…”