Abstract:

The effects of four types of waterborne acrylic resins on the properties of polybutylene terephthalate (PBAT)/starch composite materials were studied. The optimal waterborne acrylic resin was selected to further investigate the effect of its dosage on the properties of the composite material. The mechanical properties, melt flow performance, hydrophilicity and thermal properties of composite materials were analyzed with a universal tensile tester, melt flow rate tester, contact angle tester, DSC and TGA. The molecular structure and microstructure morphology of PBAT/starch composites were characterized using infrared spectroscopy and polarizing microscope. The research results indicated that waterborne acrylic resin with lower glass transition temperature had better modification effects on starch. When the dosage of B7168 (B7168) was 25.2g, the tensile strength and elongation at break of the composite material had the optimal values, which were increased by 10.8% and 38.5%, respectively, compared to the blank sample. Increasing with B7168, the melt flow rate of the composite material first decreased and then changed slightly, and the hydrophilicity increased. The effect on the crystallization and melting temperature of PBAT was not significant, also to spherical morphology, however, the size of PBAT decreased. The intensity of the infrared response peak from 3000cm^-1 to 3600cm^-1 showed an increasing trend, and the wave peak moved slightly towards a lower wavenumber direction. Thermogravimetric analysis results indicated that the addition of B7168 increased the initial thermal decomposition temperature of the system and the residual amount at 700 ℃.

Key words: polybutylene terephthalate adipate, starch, waterborne acrylic resins, biodegradable plastics

摘要：

研究了四种水性丙烯酸树脂对聚对苯二甲酸-己二酸丁二酯（PBAT）/淀粉复合材料性能的影响，选择最佳水性丙烯酸树脂进一步研究其用量对复合材料性能的影响。通过万能拉伸测试仪、熔体流动速率仪、接触角测试仪、差式扫描量热仪、热失重分析仪对复合材料力学性能、熔体流动性能、亲水性能、热性能进行了分析；采用红外光谱仪、偏光显微镜对PBAT/淀粉复合材的分子结构与微观组织形貌进行了表征。研究结果表明：玻璃化温度较低的水性丙烯酸树脂对淀粉的改性效果更佳；当水性丙烯酸树脂7168（B7168）用量为25.2g时，复合材料拉伸强度和断裂伸长率有最佳值，较空白样提高10.8%和38.5%；随B7168的增加，复合材料熔体流动速率先减小后趋于平缓，亲水性能增加，对PBAT的结晶和熔融温度影响不明显，对球晶形貌影响不大，但使球晶平均直径略有减小，3000~3600 cm^-1的红外响应峰强度有增加的趋势，波峰略向低波数方向移动；热失重显示B7168的加入，使体系热分解起始温度提前，700℃残余量增加。

关键词: 聚对苯二甲酸-己二酸丁二酯, 淀粉, 水性丙烯酸树脂, 可降解塑料