In this research the thermal, crystallization, and mechanical properties of branched poly(butylene succinate) (PBS) copolymers, which were synthesized through a two-stage esterification and condensation polymerization from 1,4-butanediol, 1,2-decanediol, and succinic acid and abbreviated as PBDS, were systematically investigated and compared with those of PBS homopolymer. Both PBS and PBDS copolymers showed relatively high and similar molecular weights, with the weight average molecular weights of 6.89 × 10⁴ g/mol and above. PBDS copolymers showed the similar high thermal stability as PBS. With an increase in 1,2-decene succinate (DS) content, the glass transition temperature, melting point temperature, and equilibrium melting point temperature of PBDS copolymers gradually decreased. At the same cooling rate, the melt crystallization temperature of PBDS copolymers decreased, while at the same degree of supercooling, the crystallization half-time increased. The branching did not modify the crystallization mechanism and crystal structure of PBDS copolymers. Both the storage modulus and the glass transition temperature of PBDS copolymers gradually decreased with increasing the DS content. Compared with PBS, increasing the DS content obviously improved the elongation at break and accordingly decreased the Young’s modulus and tensile strength of PBDS copolymers. In brief, the thermal, crystallization, and mechanical properties of PBS may be conveniently tuned by a copolymerization method via the introduction of branching.

在这项研究中，支链聚（丁二酸丁二酯）（PBS）共聚物的热，结晶和力学性能是通过两步酯化和缩聚反应由1,4-丁二醇，1,2-癸二醇和琥珀酸合成的对丙烯酸和缩写为PBDS的酸进行了系统的研究，并与PBS均聚物进行了比较。PBS和PBDS共聚物均显示出相对较高和相似的分子量，重均分子量为6.89×10 ⁴g / mol及以上。PBDS共聚物显示出与PBS类似的高热稳定性。随着1,2-癸烯琥珀酸酯（DS）含量的增加，PBDS共聚物的玻璃化转变温度，熔点温度和平衡熔点温度逐渐降低。在相同的冷却速率下，PBDS共聚物的熔融结晶温度降低，而在相同的过冷度下，结晶半衰期增加。支链没有改变PBDS共聚物的结晶机理和晶体结构。PBDS共聚物的储能模量和玻璃化转变温度都随着DS含量的增加而逐渐降低。与PBS相比，增加DS含量明显改善了断裂伸长率，并因此降低了PBDS共聚物的杨氏模量和拉伸强度。简而言之，可以通过引入支化的共聚方法方便地调节PBS的热，结晶和机械性能。