Biodegradable polymers with advantageous physical and chemical properties are described, as well as methods for making such polymers. In one embodiment, a new chemical synthesis route to technologically important biodegradable poly(3-hydroxybutyrate) (P3HB) with high isotacticity and molecular weight required for a practical use is described. The new route can utilize racemic eight-membered cyclic diolide (rac-DL), meso-DL, or a rac-DL and meso-DL mixture, derived from bio-sourced dimethyl succinate, and enantiomeric (R,R)-DL and (S,S)-DL, optically resolved by metal-based catalysts. With a stereoselective racemic molecular catalyst, the ROP of rac-DL under ambient conditions produces rapidly P3HB with essentially perfect isotacticity ([mm]>99%), high crystallinity and melting temperature (Tm=171° C.), as well as high molecular weight and low dispersity (Mn=1.54×105 g/mol, Ð=1.01).
本文介绍了具有良好物理和
化学性质的可
生物降解聚合物,以及制造这种聚合物的方法。在一个实施方案中,描述了一种新的
化学合成路线,可制得具有重要技术意义的
生物可降解聚(3-羟基
丁酸酯)(P3HB),该聚合物具有实际用途所需的高同素异形度和分子量。这条新路线可以利用外消旋八元环二元醇(rac-DL)、中消旋二元醇(meso-DL)或rac-DL 和中消旋二元醇混合物(从
生物来源的
丁二酸二甲酯中提取),以及对映体(R,R)-DL 和 (S,S)-DL,通过
金属催化剂进行光学解析。在立体选择性外消旋分子催化剂的作用下,rac-DL 在环境条件下的 ROP 可迅速生成 P3HB,其同工度基本完美([mm]>99%),具有高结晶度和熔融温度(Tm=171° C.),以及高分子量和低分散性(Mn=1.54×105 g/mol,Ð=1.01)。