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在PBS主链中同时引入己内酯(CL)和1,4-环己烷二甲醇(1,4-CHDM),或CL和二乙醇酸(DGA)得到了PBS-co-PCL-co-CHDM和PBS-co-PCL-co-DGA三元共聚物。通过1H-NMR、FTIR对三元共聚物的结构进行了表征,并采用热分析、广角X射线衍射分析和拉力试验比较了三元共聚物的性能。结果表明:随着CL、1,4-CHDM、DGA的引入,三元共聚物的结晶尺寸有所减小,结晶度降低,与PBS相比晶型略有变化;并且tanδ均增大,而储能模量均降低;在CL同时存在的条件下,1,4-CHDM的加入使共聚物的的玻璃化温度(Tg)上升为-30℃,DGA的加入却使Tg下降为-36℃,但二者的热分解温度仍在300℃以上;改性后三元共聚物的柔韧性增强断,裂伸长率显著提高。
PBS-co-PCL-co-PCL was obtained by introducing caprolactone (CL) and 1,4-cyclohexanedimethanol (1,4-CHDM), or CL and diglycolic acid (DGA) CHDM and PBS-co-PCL-co-DGA terpolymer. The structure of the terpolymer was characterized by1H-NMR and FTIR. The properties of the terpolymer were compared by thermal analysis, wide angle X-ray diffraction analysis and tensile test. The results showed that with the introduction of CL, 1,4-CHDM and DGA, the crystallinity of the terpolymer decreased, the crystallinity decreased, and the crystal form changed slightly compared with that of PBS. The storage modulus of the copolymers decreased with the presence of CL. The addition of 1,4-CHDM increased the glass transition temperature (Tg) of the copolymers to -30 ℃ and the addition of DGA decreased the Tg to -36 ℃ , But the thermal decomposition temperature of the two is still above 300 ℃; the flexibility of the modified terpolymer is enhanced, the elongation at break is significantly increased.