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采用熔融缩聚法,以稀土-钛复合物为催化剂,以对苯二甲酸二甲酯、1,4-丁二醇和1,4-丁二酸为单体,制备了一系列相对分子质量较大、相对分子质量分布较窄的聚(对苯二甲酸丁二醇酯-co-丁二酸丁二醇酯)共聚酯。采用凝胶渗透色谱、核磁共振、示差扫描量热和广角X射线衍射等手段表征了该系列共聚酯的结构、热性能和结晶性能,并对它们的宏观力学性能及生物降解性进行了分析和描述。实验结果表明,在共聚酯中当脂肪族单元的摩尔分数为60%~80%时,共聚酯具有较好的热性能和力学性能,且具有一定的生物降解性。
Using melt polycondensation method, rare earth - titanium complex as catalyst, dimethyl terephthalate, 1,4 - butanediol and 1,4 - succinic acid as monomer, a series of relatively large molecular weight , Poly (butylene terephthalate-co-succinate) copolyester with relatively narrow molecular mass distribution. The structure, thermal properties and crystallization properties of the copolyesters were characterized by gel permeation chromatography, nuclear magnetic resonance, differential scanning calorimetry and wide-angle X-ray diffraction. Their macroscopic mechanical properties and biodegradability were also analyzed And description. The experimental results show that the copolyester has good thermal and mechanical properties and has certain biodegradability when the molar fraction of aliphatic units in the copolyester is 60% ~ 80%.