树脂是多元酸和多元羟基化合缩聚而成。
Polyester resins are the condensation products of polybasic acids and polyols.
目的分析刺梨果中多元酸和高级脂肪酸的组成。
Objective To analyze polybasic acids and higher fatty acids of Rosa roxburghii Tratt fruit.
在催化剂、链支化剂存在下多元酸和多元醇直接熔融酯化、常压缩聚合成饱和羟基聚酯。
A saturated hydroxy polyester resin has been prepared with polycarboxylic acid and polyol at the presence of catalyst and chain transfer agent by the direct melt esterification process.
在催化剂、链支化剂存在下多元酸和多元醇直接熔融酯化、常压缩聚合成饱和羟基聚酯。
A saturated hydroxy polyester resin has been prepared with polycarboxylic acid and polyol at the presence of catalyst and chain transfer agent by the direct melt esterification process.
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