Unsaturated polyesters, in particular unsaturated polyesters with low volatility or without styrene, are gaining increasing importance in gel coatings, adhesives and molding resins. However, the cured unsaturated polyesters are usually described as non-degradable polyesters, which will lead to environmental and safety problems. In this paper, a kind of unsaturated copolyester with different binary acid composition, named poly (butylene succinate-co-butylene itaconic) (PBISx), was synthesized. Then, a photo-curable polyester(CPBIS) which can degrade under certain conditions was obtained by thiol - ene click reaction without adding styrene curing agent. The physical properties of unsaturated polyester PBISx can be effectively controlled by changing the ratio of raw materials, such as T_g from - 23.7 ^oC to - 45.2 ^oC, Xc from 38% to 14%, and T_m from 109.6 °C to 74.9 °C. It was found that CPBIS completely lost its degradability in lipase when its gel rate exceeded 98%. However, CPBIS could be degraded in GSH regardless of the gel rate, and lipase resumed its degradation in the GSH/lipase mixture, and the degradation rate reached 12% at 70h, attributed to the selective degradation of C-S-C bond by GSH and the secondary degradation of ester bond by lipase.

不饱和聚酯，特别是挥发性低或不含苯乙烯的不饱和聚酯，在凝胶涂料，粘合剂和模塑树脂中的重要性日益提高。然而，固化的不饱和聚酯通常被描述为不可降解的聚酯，这将导致环境和安全问题。本文合成了一种具有不同二元酸组成的不饱和共聚酯，称为聚丁二酸丁二酸酯-共-丁烯衣康酸（PBISx）。然后，在不添加苯乙烯固化剂的情况下，通过硫醇-烯点击反应获得了可以在一定条件下降解的光固化聚酯（CPBIS）。不饱和聚酯PBISx的物理性​​质可以通过改变原料比（例如T _g从-23.7）来有效控制。^o C到-45.2 ^o C，Xc从38％到14％，T _m从109.6°C到74.9°C。发现当胶凝率超过98％时，CPBIS完全丧失了其在脂肪酶中的降解性。然而，无论凝胶速率如何，CPBIS均可在GSH中降解，并且脂肪酶在GSH /脂肪酶混合物中恢复降解，并且在70h时降解率达到12％，这归因于GSH对CSC键的选择性降解和二次降解。脂酶的酯键。