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

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