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首页> 外文期刊>Journal of Applied Polymer Science >SYNTHESIS AND THERMAL STABILITY OF NOVEL ANION EXCHANGE RESINS WITH SPACER CHAINS
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SYNTHESIS AND THERMAL STABILITY OF NOVEL ANION EXCHANGE RESINS WITH SPACER CHAINS

机译：带有间隔链的新型阴离子交换树脂的合成及热稳定性

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摘要

Spacer-modified anion exchange resins were prepared by suspension copolymerization of omega-bromoalkylstyrenes or omega-bromoalkyloxymethylstyrenes with 2-8 mol % of divinylbenzene, followed by quaternization with trimethylamine. The thermal stability of the spacer-modified anion exchangers of the OH form was examined by standing the resins in deionized water at 100-140 degrees C for 30-90 days. The anion exchangers with alkylene chains such as butylene or heptylene groups between the benzene ring and the quaternary nitrogen exhibited higher thermal stability compared with commercial, strongly basic anion exchangers with benzylic ammonium groups. The thermal stability of the exchangers with butyleneoxymethylene or hexyleneoxymethylene spacers was also higher than that of the commercial exchangers. The exchanger with the propyleneoxymethylene spacer, however, had less stability than did the commercial ones. The decreased stability of this spacer-modified exchanger is due to the accelerated degradation of the spacer chain via Hofmann elimination. The excellent stability of the anion exchangers with alkylene or alkyleneoxymethylene spacers, except propyleneoxymethylene, results from the structure of the exchangers, where there are no reactive benzylic carbons, which are attached directly to the quaternary nitrogen. (C) 1997 John Wiley & Sons, Inc. [References: 10]
机译：通过将ω-溴代烷基苯乙烯或ω-溴代烷氧基甲基苯乙烯与2-8 mol％的二乙烯基苯悬浮共聚，然后用三甲胺进行季铵化，来制备间隔物改性的阴离子交换树脂。通过将树脂在100-140摄氏度的去离子水中静置30-90天来检查OH形式的间隔基修饰的阴离子交换剂的热稳定性。与具有苄基铵基团的市售强碱性阴离子交换剂相比，在苯环和季氮之间具有亚烷基链（如丁烯基或庚烯基）的阴离子交换剂显示出更高的热稳定性。具有丁烯氧基亚甲基或己烯氧基亚甲基间隔基的交换器的热稳定性也高于商业交换器。但是，带有丙烯氧亚甲基间隔基的交换器比商业交换器具有较小的稳定性。该间隔基修饰的交换体的稳定性降低是由于间隔基链由于霍夫曼消除而加速降解。具有亚烷基或亚烷基氧亚甲基间隔基的阴离子交换剂（除亚丙基氧亚甲基之外）的极好的稳定性是由于该交换剂的结构所致，其中没有反应性苄基碳直接与季氮相连。 （C）1997 John Wiley＆Sons，Inc. [参考：10]

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