【摘要】 首先制备了马来酸酐(MA)改性热塑性淀粉(MTPS),并将其与聚乳酸(PLA)和聚(己二酸丁二醇酯/对苯二甲酸丁二醇酯)共聚物熔融共混制备了PLA/PBAT/MTPS三元共混物。其中固定MTPS的含量为20%,改变PBAT含量,通过扫描电镜(SEM)、红外光谱(FTIR)、差示扫描量热仪(DSC)、力学性能测试以及耐溶剂性测试,分析了PBAT的含量对材料形貌及性能的影响。结果表明,PBAT可以与淀粉发生酯交换反应,随着PBAT含量的增加,淀粉粒子尺寸减小,当PBAT含量达到30%时,PBAT对淀粉形成包裹结构。此时,材料的韧性明显提高,伸长率可以达到260%。此外,由于材料内部结构的改变,材料的耐溶剂性以及PBAT的结晶性能明显提高。更多还原

【Abstract】 After the maleic anhydride modified thermoplastic starch( MTPS) was prepared,the ternary blends of poly( lactic acid)( PLA) / poly( butylene adipate-co-terephthalate)( PBAT) / MTPS were prepared by melt blending. When fixing the MTPS content at 20% and changing the PBAT content,the effect of the introduction of PBAT on the morphology and properties of the materials were mainly studied by scanning electron microscope( SEM), fourier transform infrared spectroscopy( FTIR), differential scanning calorimeter( DSC),mechanical test and solvent resistance test. The results show that PBAT can react with starch through ester-interchange reaction. As the PBAT content increases, the mean radius of the starch granules reduces greatly. When PBAT content increases to 30%,MTPS is coated by PBAT phase. At the same time,the toughness is improved significantly with the elongation at break reached maximum value of about 260%. What is more,because of the change of the material’s internal structure,the solvent resistance of the material and the crystalline ability of PBAT are significantly improved.更多还原