Cross-Linked Quaternized Poly(styrene-b-(ethylene-co-butylene)-b-styrene) for Anion Exchange Membrane: Synthesis, Characterization and Properties

Abstract

Poly(styrene-b-(ethylene-co-butylene)-b-styrene) triblock copolymer (SEBS) was selected for functionalization and cross-linking reaction to prepare the anion exchange membrane. The cross-linked quaternized SEBS (QSEBS-Cn) membranes were synthesized by simultaneous of quaternization and cross-linking of chloromethylated SEBS with α,ω-difunctional tertiary amines. The spacer groups of (-CH2-)n in diamines did affect the functionalization, micromorphology and properties of the resulting QSEBS-Cn membranes. The ionic conductivity of QSEBS-Cn membranes greatly increased and methanol resistance slightly decreased with increasing the length of spacer groups in the cross-linked structures from -(CH2)- to -(CH2)6-. Compared to the un-cross-linked QSEBS, the QSEBS-Cn membranes behaved much higher mechanical property, service temperature, chemical stability and thermal stability. Moreover, the hybrid composite membrane of QSEBS-C6 with 0.5% of graphene oxide could also be in situ prepared. This hybrid membrane had both relatively high ionic conductivity of 2.0 × 10(-2) S·cm(-1) and high selectivity of 7.6 × 10(4) S·s·cm(-3) at 60 °C due to its low methanol permeability.

A facile approach to prepare crosslinked polysulfone-based anion exchange membranes with enhanced alkali resistance and dimensional stability

“…Particularly, cross-linked AEMs with high IEC values can minimize swelling, increase steric hindrance of degradation in alkaline environments, and decrease the attack of OH À on the polymer backbone or ion exchange groups, thus improving alkali stability. 27,28 Cross-linked AEMs can be prepared by various methods, such as a series of end-linked cross-linked AEMs by "click chemistry", 29 reacting halomethylated polymers with diols, dihalides, and diamines, [30][31][32][33][34] ring-opening metathesis polymerization (ROMP), 35,36 and thermal cross-linking. 37,38 Generally, preparation of cross-linked AEMs requires two steps, which are quaternization and cross-linking.…”

Radiation synthesis of polysilane‐modified graphene oxide for improving thermal conductivity and mechanical properties of silicone rubber

“…Moreover, as a polymer filler, it has a poor compatibility with polymer and unevenly disperses in the matrix, thus affecting the properties of the composite . To deal with these issues, a variety of approaches have been tried to improve dispersion of GO . The GO surface can be modified through chemical treatments due to the existence of oxygen‐containing functional groups.…”

Enhanced properties of poly(styrene–b–ethylene–co–butylene–b–styrene) nanocomposites with in situ construction of interconnected graphene network

“…Thermoplastic elastomers like poly(styrene–ethylene– co –butadiene– b –styrene) (SEBS) is a styrene‐based thermoplastic polymer, which allows properties similar to a vulcanized rubber without the need to go through the vulcanization process . Up to now, the main concentration of researches on SEBS/GE composites is electrical and mechanical properties, electromagnetic interference shielding effectiveness and the fabrication of masterbatch . The common measures, such as the modification or functionalization of GE or SEBS, are generally adopted in these studies.…”