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首页> 外文期刊>Journal of Applied Polymer Science >A Thiol-ene Clickable Hyperbranched Polyester via a Simple Single-Step Melt Trans-Esterification Process
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A Thiol-ene Clickable Hyperbranched Polyester via a Simple Single-Step Melt Trans-Esterification Process

机译：通过简单的一步熔体反式酯化工艺制备的硫代烯烃可点击的超支化聚酯

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摘要

Self-condensation of AB_2 type monomers (containing one A-type and two B-type functional groups) generates hyperbranched (HB) polymers that carry numerous B-type end-groups at their molecular periphery; thus, development of synthetic methods that directly provide quantitatively transformable peripheral B groups would be of immense value as this would provide easy access to multiply functionalized HB systems. A readily accessible AB_2 monomer, namely diallyl, 5-(4-hydroxybutoxy)isophthalate was synthesized, which on polymerization under standard melt-transesterfication conditions yielded a peripherally clickable HB polyester in a single step; the allyl groups were quantitatively reacted with a variety of thiols using the facile photoinitiated "thiol-ene" reaction to generate a wide range of derivatives, with varying solubility and thermal properties. Furthermore, it is shown that the peripheral allyl double bonds can also be readily epoxidized using meta-chloroperoxybenzoic acid to yield interesting HB systems, which could potentially serve as a multifunctional cross-linking agent in epoxy formulations.
机译：AB_2型单体（包含一个A型和两个B型官能团）的自缩合产生超支化（HB）聚合物，该聚合物在其分子外围带有多个B型端基。因此，直接提供可定量转化的外围B基团的合成方法的开发将具有巨大的价值，因为这将提供对多功能HB系统的便捷访问。合成了一种易于获得的AB_2单体，即二烯丙基5-（4-羟基丁氧基）间苯二甲酸酯，在标准的熔融酯交换条件下进行聚合，可在一步中得到可点击的HB聚酯。使用容易的光引发的“硫醇-烯”反应，使烯丙基与各种硫醇进行定量反应，以生成各种具有不同溶解度和热性质的衍生物。此外，已表明，使用间氯过氧苯甲酸也可以容易地环氧化烯丙基双键，生成有趣的HB系统，该系统可能在环氧配方中用作多功能交联剂。

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