聚己内酯接枝甲基丙烯酸缩水甘油酯的制备及对聚己内酯/淀粉的增容作用

Compatibilizing Effect of Polycaprolactone Grafted with Glycidyl Methacrylate on Polycaprolactone/Starch Blends

以过氧化苯甲酰(BPO)为引发剂,甲基丙烯酸缩水甘油酯(GMA)为反应单体,通过熔融接枝反应将GMA接枝到聚己内酯(PCL)上,制备了PCL-g-GMA。以PCL-g-GMA为增容剂,制备了PCL/淀粉/PCL-g-GMA共混物。扫描电镜表明,PCL/淀粉共混物界面粘接力差、淀粉出现团聚。然而加入PCL-g-GMA后,PCL/淀粉/PCL-g-GMA中淀粉分散变得均匀,且淀粉颗粒被PCL包裹,两相界面更加模糊。拉伸实验表明,加入PCL-g-GMA增容剂后,共混物的拉伸强度由(12.3±2.1)MPa增加到(17.0±3.2)MPa,拉伸模量由(4.2±1.8)GPa增加到(5.7±2.9)GPa.断裂伸长率由(210±16)%增加到(803±40)%。

Polyeaprolactone-graft-glycidyl methacrylate （PCL-g-GMA） copolymer was prepared by grafting GMA onto PCL using benzoyl peroxide （BPO） as an initiator. PCL/starch blends were prepared by using PCL-g-GMA copolymer as a compatibilizer. SEM results show that the interfacial adhesion of PCL/starch blends without the PCL- g-GMA copolymer is poor and the starch granules are clearly observed. The starch granules are better dispersed and covered with PCL when the PCL-g-GMA copolymer was added as a compatibilizer. Compared with PCL/starch blends, the mechanical properties of PCL/starch/PCL-g-GMA blends are obviously increased, such as tensile strength at break increasing from （12.3 ＋ 2.1） MPa to （17.0 ＋ 3.2） MPa, tensile modulus from （4.2 ＋ 1.8） GPa to （5.7 ＋ 2.9） GPa and elongation at break from （210 ＋ 16） % to （803 ＋- 40） %.