Synthesis and characterization of sulfonated poly(styrene-isoprene-styrene): Effects of linear vs. branched morphology and counter-ion substitution

Synthesis and characterization of sulfonated fluorinated block copolymer membranes with different esterified initiators for DMFC applications

“…To investigate the role of the initiators on the thermal stability of the polymers, EtlB‐PS‐b‐PHFBMA and Zonyl ® ‐PS were exchanged with a solution 0.1 M of NaOH for 48 h and then their thermal behavior were obtained. Studies suggest that the interactions of the counter‐ion with a specific group, like ethers or the sulfonic group improve the polymer stability. A unique feature was observed for EtlB‐PS‐b‐PHFBMA exchanged with Na +1 Figure (A).…”

“…The second degradation region at 200–350°C corresponds to the degradation of the sulfonic group. The third degradation at 350–450°C represents the polymer backbone degradation, as well as the last degradation at 450–650°C . Figure (B) shows the TGA curve for SIBS SO 3 H / Zonyl ® ‐PS membrane.…”

“…SIBS was sulfonated using acetyl sulfate as the sulfonating agent. The sulfonation process is described in more detail elsewhere . Sulfonated SIBS (SIBS SO 3 H) was used to prepare polymer blends with the fluoropolymers.…”

“…Proton exchange membranes (PEM's) for direct methanol fuel cells (DMFC) is another application where sulfonated fluoropolymers (e.g., Nafion ® ) are used, because they possess high proton conductivity and excellent thermal, mechanical and barrier properties . Our group has worked with different PEM's for DMFC that explored different chemical functionalities and processing approaches to influence morphology . These studies have demonstrated the sensitivity of the transport properties to the resulting nanostructure and the electronic configuration inside the resulting ionic nanochannels.…”

Preparation and characterization of polarity-modulated SIS-based hot-melt pressure-sensitive adhesives

“…These methods have been used to introduce polar functional groups in the styrene or diene blocks of the styrenic block copolymers. [12,[21][22][23][24][25][26][27] Among these methods, the epoxidation procedures are utilized to incorporate epoxide groups into the diene blocks of the copolymers, in which some oxidants, such as metal catalyzed/hydrogen peroxide, dimethyldioxirane, meta-chloroperbenzoic acid, and in situ per-formic acid, have been adopted. [22,[28][29][30] To synthesize templates for nanostructured thermosets, metal catalyzed/hydrogen peroxide, dimethyldioxirane, and meta-chloroperbenzoic acid have been utilized to epoxidize SIS or SBS copolymers with high epoxidation degrees (>60 mol%).…”