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首页> 外文期刊>Journal of Applied Polymer Science >Effect of block composition, size and functionality of poly(styrene- isobutylene-styrene) copolymers
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Effect of block composition, size and functionality of poly(styrene- isobutylene-styrene) copolymers

机译：聚（苯乙烯-异丁烯-苯乙烯）共聚物的嵌段组成，尺寸和官能度的影响

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摘要

This investigation studied the resulting nanostructure and transport properties of ionic membranes composed of sulfonated copolymers with thermoplastic and elastomeric blocks. Poly(styrene-isobutylene-styrene) (SIBS) of different number average molecular weight (Mn) and polystyrene weight fraction were sulfonated to various levels of ion exchange capacity. The solvent-casted membranes were characterized using several techniques including elemental analysis, Fourier transform infrared spectroscopy-, thermogravimetric analysis, and small-angle X-ray scattering. These techniques were used to evaluate the thermal and physical properties of the membranes, which in turn, allowed for the comparison of resulting morphologies and selectivities. In addition, counter-ion substitution (Mg~(+2), Ca~(+2), Ba ~(+2)) was used to crosslink the sulfonated polymers to further influence their selectivity. Vapor permeabilities were measured at 308 K using dimethyl methyl-phosphonate, a chemical compound similar to Sarin Gas, and water, to evaluate the selectivity of the membranes and their potential application for chemical and biological protective clothing.
机译：这项研究研究了由磺化共聚物与热塑性和弹性体嵌段组成的离子膜的纳米结构和传输性能。将数均分子量（Mn）和聚苯乙烯重量分数不同的聚（苯乙烯-异丁烯-苯乙烯）（SIBS）磺化至各种水平的离子交换容量。使用几种技术，包括元素分析，傅立叶变换红外光谱，热重分析和小角度X射线散射，对溶剂浇铸膜进行了表征。这些技术用于评估膜的热和物理性质，从而可以比较所得的形貌和选择性。另外，使用抗衡离子取代（Mg〜（+2），Ca〜（+2），Ba〜（+2））交联磺化聚合物，以进一步影响其选择性。使用与莎林气体相似的化合物膦酸二甲酯和水在308 K下测量蒸汽渗透率，以评估膜的选择性及其在化学和生物防护服中的潜在应用。

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