PBSA-g-MG增容改性热塑性淀粉/PBSA复合材料

以过氧化二异丙苯（DCP）为引发剂，通过熔融接枝将马来酸酐（MA）和甲基丙烯酸缩水甘油酯（GMA）接枝到PBSA（聚丁二酸/聚己二酸-co-丁二醇酯）分子链上，制备了PBSA-g-MG增容剂。采用红外光谱和核磁共振氢谱对增容剂的化学结构进行表征，并探究了PBSA-g-MG的添加量对热塑性淀粉（TPS）与PBSA复合材料（TPS/PBSA）的力学性能、微观形貌、动态热机械性能和吸水性能的影响。结果表明，该增容剂可改善纤维增强的TPS/PBSA复合材料的界面相容性，TPS相与PBSA相的T_g相互靠近，TPS/PBSA的力学性能和耐水性提高。添加质量分数8%增容剂的TPS/PBSA复合材料在59%湿度下的力学强度可达19.4 MPa，比未增容的复合材料提高了将近130%。

Thermoplastic Starch/PBSA Composite Compatibilized and Modified by PBSA-g-MG

Maleic anhydride (MA) and glycidyl methacrylate (GMA) were grafted onto poly(butylene succinate-co-butylene adipate) (PBSA) molecular chains in the melt state by using dicumyl peroxide (DCP) as an initiator. Compatibilizer marked PBSA-g-MG was successfully prepared. The chemical structure of the compatibilizer was characterized by FT-IR and ¹H-NMR. The effect of PBSA-g-MG dosage on mechanical properties, microstructure, dynamic mechanical properties and water absorption of fiber-reinforced thermoplastic starch (TPS)/PBSA composites were also studied. The results showed that PBSA-g-MG improved the interface compatibility of TPS/PBSA composite, and made T_g of TPS phase and that of PBSA phase close to each other. The mechanical strength and water resistance of TPS/PBSA also improved due to the introduction of PBSA-g-MG. The mechanical strength of TPS/PBSA composite with 8% mass fraction compatibilizer reached 19.4 MPa at 59% relative humidity, which was nearly 130% higher than that of non-compatibilized composites.