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改性纳米HA对PLA-PBAT共混体系结晶与流变性能的影响

, PP. 569-577

Keywords: 聚乳酸,聚己二酸丁二酯-对苯二甲酸丁二酯,改性纳米羟基磷灰石,结晶,流变行为

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Abstract:

采用熔融共混挤出法制备改性纳米羟基磷灰石(HA)/聚乳酸(PLA)-聚己二酸丁二酯-对苯二甲酸丁二酯(PBAT)复合降解材料,利用差示扫描量热仪(DSC)、流变仪、电子拉伸机、扫描电镜(SEM)等,对其结晶、流变行为、力学性能、冲击性能、表面结构等进行了研究。DSC结果表明:随着改性纳米HA添加量的增多,HA/PLA-PBAT共混体系的玻璃化转变温度先升高后下降;冷结晶温度逐渐下降,降低了13℃,结晶能力有所提高;结晶度由24.33%增加到33.47%。流变行为显示共混体系黏度随剪切速率的增大而减小,属非牛顿流体。此外,随着改性纳米HA的增多,HA/PLA-PBAT共混体系储存模量和损耗模量逐渐减小;屈服强度、缺口冲击强度、拉伸强度先增大后减小,当共混体系中改性纳米HA添加量为2%(80/20/2)时,达到最大值。SEM观察发现,少量改性纳米HA可以均匀分散在PLA-PBAT基体中并能显著提高其韧性。

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