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首页> 外文期刊>Polymers for advanced technologies >Syntheses of biodegradable (multi) block copolymers, star-shaped polyesters and networks via ring-expansion polymerization
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Syntheses of biodegradable (multi) block copolymers, star-shaped polyesters and networks via ring-expansion polymerization

机译：通过扩环聚合合成可生物降解的（多）嵌段共聚物，星形聚酯和网络

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Numerous cyclic dibutyltin alkoxides were prepared by condensation of Bu{sub}2Sn(OMe){sub}2 with various short or long α,ω-diols. Insertion of lactones or lactide into the Sn - O bonds resulted in ring-expansion polymerizations which allowed a control of the ring size (chain length) via the monomer initiator ratio. When the cyclic initiators were derived from a long α,ω-diol, such as poly(tetrahydro-furan)diols or polysiloxane diols, the resulting cyclic polylactones were necessarily cyclic triblock copolymers. The high nucleophilicity of the Sn-O bond enabled ringopening polycondensations with dicarboxylic acid dichlorides yielding multiblock copolyesters. Condensations with monocarboxylic acids yielded functionalized A-B-A triblock copolymers. Polycondensation with trifunctional acid chlorides yielded biodegradable networks. Hydroxyethylated pentaerythritol condensed with Bu{sub}2Sn(OMe){sub}2 yielded a spirocyclic initiator. Ringexpansion polymerization with lactones followed by acylation with carboxylic acid chlorides produces starshaped polylactones having functional endgroups. Biodegradable networks were also obtained when bisstannylenated α-glucose methyl glycoside was used as initiator for ε-caprolactone, and when the resulting spirocyclic polylactone was polycondensed with sebacoyl chloride.
机译：通过将Bu {sub} 2Sn（OMe）{sub} 2与各种短或长的α，ω-二醇缩合，可制得许多环状的二丁基锡醇盐。将内酯或丙交酯插入到Sn-O键中导致扩环聚合，其允许通过单体引发剂比率控制环尺寸（链长）。当环状引发剂衍生自长的α，ω-二醇，例如聚（四氢呋喃）二醇或聚硅氧烷二醇时，所得环状聚内酯必定是环状三嵌段共聚物。 Sn-O键的高亲核性使二羧酸二氯化物能够开环缩聚，从而形成多嵌段共聚酯。与一元羧酸的缩合产生官能化的A-B-A三嵌段共聚物。与三官能团酰氯的缩聚反应产生了可生物降解的网络。与Bu {sub} 2Sn（OMe）{sub} 2缩合的羟乙基化季戊四醇产生螺环引发剂。与内酯的扩环聚合，然后与羧酸氯化物酰化，产生具有官能端基的星形聚内酯。当使用双苯乙烯基化的α-葡萄糖甲基糖苷作为ε-己内酯的引发剂，以及将所得的螺环聚内酯与癸二酰氯缩聚时，也可获得可生物降解的网络。

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