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首页> 外文期刊>Journal of Applied Polymer Science >POLYPHOSPHAZENE MEMBRANES .1. SOLID-STATE PHOTOCROSSLINKING OF POLY[(4-ETHYLPHENOXY)(PHENOXY)PHOSPHAZENE]
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POLYPHOSPHAZENE MEMBRANES .1. SOLID-STATE PHOTOCROSSLINKING OF POLY[(4-ETHYLPHENOXY)(PHENOXY)PHOSPHAZENE]

机译：多磷腈膜1。聚[（4-乙氧基）（苯氧基）磷腈]的固态光交联

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摘要

Dense films of poly[(4-ethylphenoxy) (phenoxy)phosphazene] (PEPP), a potentially attractive ion-exchange membrane material, were crosslinked to varying degrees using UV light and a photoinitiator. This polymer contained two kinds of substituents: phenoxy groups to be used for possible functionalization (e.g., sulfonation) and ethylphenoxy sidechains for photocrosslinking, where hydrogens at the benzylic carbons could be abstracted by a photoinitiator-leaving macroradicals that after recombination formed covalent bonds. The polyphosphazene polymer was synthesized, mixed with a photoinitiator, shaped into a thin film by solvent casting, and irradiated with UV light for a specified period of time. Benzophenone (BP), was selected as the photoinitiator because it was miscible with polyphosphazene, had the highest rate of hydrogen abstraction, and absorbed UV light of 365 nm wavelength. The half-life of benzophenone in 50 mu m-thick irradiated films was determined to be 20 min. When the BP-PEPP molar ratio was increased from 0 to 0.5, the glass transition temperature increased after irradiation from -8.8 to 53.5 degrees C. At the same time, the equilibrium swelling in dimethylacetamide, at 25 degrees C, decreased from infinity to 0.31. Tensile strength tests of the crosslinked films revealed a nonlinear dependence on BP-PEPP molar ratio. (C) 1996 John Wiley & Sons, Inc. [References: 23]
机译：聚[（4-乙基苯氧基）（苯氧基）磷腈]（PEPP）的致密薄膜是一种潜在的有吸引力的离子交换膜材料，它使用紫外线和光引发剂在不同程度上交联。该聚合物包含两种取代基：用于可能的官能化（例如磺化）的苯氧基和用于光交联的乙基苯氧基侧链，其中苄基碳原子上的氢可以通过光引发剂离去的大自由基被抽象，在重组后形成共价键。合成聚磷腈聚合物，将其与光引发剂混合，通过溶剂浇铸将其成形为薄膜，并用紫外线照射指定的时间。选择苯甲酮（BP）作为光引发剂是因为它与聚磷腈可混溶，具有最高的氢吸收速率，并吸收了365 nm波长的紫外线。确定在50μm厚的辐照膜中二苯甲酮的半衰期为20分钟。当BP-PEPP摩尔比从0增加到0.5时，玻璃化温度在辐照后从-8.8升高到53.5摄氏度。同时，二甲基乙酰胺在25摄氏度时的平衡溶胀从无穷大降至0.31。 。交联膜的拉伸强度测试显示出对BP-PEPP摩尔比的非线性依赖性。 （C）1996 John Wiley＆Sons，Inc. [参考：23]

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