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首页> 外文期刊>Journal of Applied Polymer Science >Poly(ester amide)s derived from tartaric and succinic acids: Changes in structure and properties upon hydrolytic degradation
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Poly(ester amide)s derived from tartaric and succinic acids: Changes in structure and properties upon hydrolytic degradation

机译：酒石酸和琥珀酸衍生的聚（酯酰胺）：水解降解后结构和性质的变化

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摘要

The changes in structure and properties taking place in a set of tartaric acid-based polyamides and poly(ester amide)s upon hydrolytic degradation were examined. Poly(hexamethylene 2,3-di-O-methyl-L-tartaramide)s, either pure or containing minor amounts of succinate ester groups (less than or equal to 10%), were exposed to humidity or incubated in buffered water at pH 7.4 and 37 degrees C, and their thermal and mechanical properties were evaluated as a function of time. Both moisture uptake and hydrolysis induced a noticeable decay in the tensile properties of polymers. These effects were greatly enhanced by the presence of ester groups, whereas no large differences were noticed for changes in the enantiomeric composition. Variations in the glass transition temperatures and melting points appeared to be slight, whereas crystallinity clearly increased with incubation time. The latter effect was most apparent in poly(ester amide)s with a nearly racemic composition, in which a crystal-to-crystal transition was observed to take place upon degradation. (C) 2000 John Wiley & Sons, Inc. [References: 13]
机译：研究了一组基于酒石酸的聚酰胺和聚（酯酰胺）在水解降解后发生的结构和性能变化。将纯的或含有少量琥珀酸酯基团（小于或等于10％）的聚（六亚甲基2,3-二-O-甲基-L-酒石酰胺）暴露于湿气中或在pH缓冲液中孵育评估温度为7.4和37摄氏度，并根据时间评估其热和机械性能。水分吸收和水解均引起聚合物的拉伸性能明显下降。酯基团的存在大大增强了这些作用，而对映体组成的变化未发现大的差异。玻璃化转变温度和熔点的变化似乎很小，而结晶度则随着孵育时间的增加而明显增加。后一种作用在具有几乎外消旋组成的聚（酯酰胺）中最为明显，其中观察到降解时发生了晶体到晶体的转变。 （C）2000 John Wiley＆Sons，Inc. [参考：13]

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