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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis and biodegradation of copolyesterether of copoly(succinic anhydride ethylene oxide) with triblock copolymer of poly(oxyethylene)-poly(oxypropylene)poly(oxyethylene)
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Synthesis and biodegradation of copolyesterether of copoly(succinic anhydride ethylene oxide) with triblock copolymer of poly(oxyethylene)-poly(oxypropylene)poly(oxyethylene)

机译：共聚（琥珀酸酐环氧乙烷）与聚（氧化乙烯）-聚（氧化丙烯）-聚（氧化乙烯）的三嵌段共聚物的共聚酯醚的合成和生物降解

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摘要

The thermal properties and biodegradability of the block copolyesterethers with copoly[succinic anhydride (SA)/ethylene oxide (EO)], synthesized by ring-opening copolymerization as a hard segment and the triblock copolyethers of poly(oxyethylene)-poly(oxypropylene)-poly(oxyethylene)(PN) as a soft segment, were studied. The block copolyesterethers synthesized from higher than 8000 number-average molecular weight (M-n) of copoly(SA/EO)s showed a microphase separation structure as determined by the thermal properties [melting point (T-m) and glass transition (T-g)], at any polymer composition [EO/propylene oxide (PO)] or the determination of M-n of PN. A decrease in the M-n of copoly(SA/EO) or an increase in PO content in PN resulted in depression of heats of fusion (Delta H) of these block copolyesterethers. The enzymatic degradation of the block copolyesterethers by the lipase from Rhizopus arrhizus showed a substantial increase with a decrease in their Delta H, whereas it was depressed with an increase in the M-n of polyoxyethylene or polyoxypropylene segment in the block copolyesterethers. The block copolyesterethers were degraded by microorganisms in activated sludge. The biodegradability of the block copolyesterethers showed a pronounced drop, with an increase in the polyoxyethylene chain length or polyoxypropylene content in PN. The polycondensation was also conducted without a catalyst at 190 degrees C, similarly, to the reaction catalyzed with Ti[OCH(CH3)(2)](4) at 170 degrees C. The effect of the residual titanium on the biodegradability of the block copolyesterethers was negligible. (C) 1998 John Wiley & Sons, Inc. [References: 40]
机译：嵌段共聚酯醚与共聚[丁二酸酐（SA）/环氧乙烷（EO）]的热性质和生物降解性，通过开环共聚作为硬链段与聚（氧乙烯）-聚（氧丙烯）-的三嵌段共聚醚合成以聚（氧乙烯）（PN）为软链段进行了研究。由高于8000的数均分子量（Mn）的共聚多嵌段共聚物（SA / EO）合成的嵌段共聚酯醚显示出微相分离结构，该结构由热学性质[熔点（Tm）和玻璃化转变温度（Tg）]确定。任何聚合物组成[EO /环氧丙烷（PO）]或PN中Mn的测定。共聚（SA / EO）的M-n降低或PN中PO含量的增加导致这些嵌段共聚聚酯醚的熔融热（ΔH）降低。根状根霉的脂肪酶对嵌段共聚酯醚的酶促降解显示出随着其ΔH的降低而显着增加，而随着嵌段共聚酯醚中聚氧乙烯或聚氧丙烯链段的M-n的增加而抑制了降解。嵌段共聚酯醚被活性污泥中的微生物降解。嵌段共聚酯醚的生物降解性显示出明显的下降，其中PN中的聚氧乙烯链长或聚氧丙烯含量增加。类似于在170℃下用Ti [OCH（CH3）（2）]（4）催化的反应，也在无催化剂的情况下于190℃进行缩聚反应。残余钛对嵌段生物降解性的影响共聚酯醚可以忽略不计。 （C）1998 John Wiley＆Sons，Inc. [参考：40]

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