Poly(arylene ether sulfone) bearing multiple benzyl-type quaternary ammonium pendants: preparation, stability and conductivity,RSC Advances

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Poly(arylene ether sulfone) bearing multiple benzyl-type quaternary ammonium pendants: preparation, stability and conductivity
RSC Advances ( IF 3.9 ) Pub Date : 2017-06-14 00:00:00 , DOI: 10.1039/c7ra04214k
Qian Shi _{1,

2,

3,

4,

5} , Pei Chen _{1,

2,

3,

4,

5} , Jinfang Zhou _{1,

2,

3,

4,

5} , Qiang Weng _{1,

2,

3,

4,

5} , Xueliang Zhang _{1,

2,

3,

4,

5} , Xinbing Chen _{1,

2,

3,

4,

5} , Zhongwei An _{1,

2,

3,

4,

5}

Affiliation

A new difluoro aromatic ketone monomer, (2,6-difluorophenyl)[3,5-bis[(3,5-dimethylphenyl)methyl]phenyl]methanone, is developed to prepare a series of poly(arylene ether sulfone)s (PAES) bearing two pendant 3,5-dimethylphenyl groups via polycondensation reaction. The desired side-chain type PAESs containing multiple benzyl quaternary ammonium groups (QPAES(x/y)) are obtained by the corresponding bromomethylation and subsequent quaternization. Their properties, such as hydroxide conductivity, dimensional change, water uptake and alkaline stability, are investigated. Side-chain type membranes QPAES(x/y) with ion exchange capacities (IECs) of 0.96–1.22 mequiv. g⁻¹ display anisotropic membrane swelling and hydroxide conductivity of 39.9–49.8 mS cm⁻¹ at 80 °C. The greater length and dense distribution of the benzyl-type quaternary ammonium pendants are probably responsible for the good hydroxide conductivity and alkaline stability. Meanwhile, the corresponding crosslinked membrane (CQPAES(1/4)) shows higher conductivity, lower membrane swelling, better oxidative stability and higher chemical stability in hot alkali solution (80 °C) than the uncrosslinked one with a comparable IEC value.

中文翻译：

带有多个苄基季铵盐侧基的聚（亚芳基醚砜）：制备，稳定性和导电性

开发了一种新的二氟芳族酮单体，（2,6-二氟苯基）[3,5-双[（3,5-二甲基苯基）甲基]苯基]甲酮，以制备一系列聚（亚芳基醚砜）（PAES ）通过缩聚反应带有两个3,5-二甲基苯基侧基。通过相应的溴甲基化和随后的季铵化获得所需的含有多个苄基季铵基团（QPAES（x / y））的侧链型PAES 。研究了它们的性质，例如氢氧化物电导率，尺寸变化，吸水率和碱稳定性。侧链型膜QPAES（x / y）的离子交换容量（IEC）为0.96-1.22 mequiv。g ^-1在80°C下显示出各向异性的膜溶胀和39.9–49.8 mS cm ^-1的氢氧化物电导率。苄基型季铵盐侧基的较大长度和密集分布可能是造成良好的氢氧化物电导率和碱稳定性的原因。同时，相应的交联膜（CQPAES（1/4））在热碱溶液（80°C）中具有比未交联的IEC值更高的电导率，更低的膜溶胀，更好的氧化稳定性和更高的化学稳定性。

更新日期：2017-06-14

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