PBAT/PA6原位微纤复合材料的性能  

Properties of PBAT/PA6 in-situ microfibrillar composites

作　　者：孙静 黄安荣 李剑 罗珊珊 李娟 石敏 SUN Jing;HUANG Anrong;LI Jian;LUO Shanshan;LI Juan;SHI Min(Guizhou Material Industrial Technology Institute,Guiyang 550000,China)

机构地区：[1]贵州省材料产业技术研究院,贵阳550000

出　　处：《工程塑料应用》2024年第3期21-27,共7页Engineering Plastics Application

基　　金：黔科合支撑[2022]一般项目(224);国家自然科学基金项目(52063007);黔科合平台人才项目-GCC[2022]043;黔科合服企【2021】9号

摘　　要：为了对聚己二酸-对苯二甲酸丁二酯(PBAT)进行增强改性,选择尼龙6(PA6)作为分散相,采用自制的多级挤出拉伸装置制备了PBAT/PA6原位微纤复合材料。通过扫描电子显微镜、万能试验机、差示扫描量热仪与旋转流变仪对PBAT/PA6原位微纤复合材料的微观结构、力学性能、结晶性能及流变性能进行研究。结果表明,分散相PA6在PBAT基体中形成了微纤,当PA6质量分数为4%时,在PBAT-4试样的断面中PA6分散相呈短棒状形状,随着PA6含量的增大,PA6微纤平均直径逐渐增大,其直径分布范围也增大;当PA6质量分数为12%时,PBAT-12试样中的PA6微纤长度较长,大部分PA6微纤的长度大于30μm。PA6的加入提高了PBAT的结晶温度及屈服强度,PA6微纤对PBAT的结晶起到明显异相成核作用,使PBAT的结晶温度提高了14℃左右,PBAT/PA6原位微纤复合材料的玻璃化转变温度随PA6含量增加而逐渐向高温方向移动;随着PA6含量的增加,PBAT/PA6原位微纤复合材料的屈服强度及拉伸弹性模量先增大后减小,PBAT-12试样的屈服强度及拉伸弹性模量最大,分别为10.3MPa和233.5MPa。随着PA6微纤含量增加,PBAT/PA6复合材料的储能模量(G′)、损耗模量(G′′)和复数黏度(η*)值先增大后减小,PBAT-12试样呈现出最高的G′,G′′和η^(*)值。In order to reinforce the polybutylene adipate terephthalate(PBAT),polyamide 6(PA6)was selected as the dispersed phase,and the PBAT/PA6 in-situ microfibrillar composites were prepared using a multi-stage extrusion and stretching device.The microstructure,mechanical properties,crystallization properties,and rheological properties of PBAT/PA6 in-situ micro‐fibrillar composites were studied using scanning electron microscopy,testing machine,differential scanning calorimeter,and rota‐tional rheometer.The results indicate that PA6 is dispersed into the PBAT matrix in the form of PA6 microfibrils,with the increase of PA6 content,the average diameter of PA6 microfibrils gradually increase,and its diameter distribution also increase.When the mass fraction of PA6 is 12%,the length of PA6 microfibrils in the PBAT-12 sample is longer,and most of the PA6 microfibrils have a length greater than 30μm.The addition of PA6 increase the crystallization temperature and yield strength of PBAT,PA6 microfibrils act as the heterogeneous nucleation role in the crystallization of PBAT,increasing the crystallization temperature of PBAT by about 14℃.The glass transition temperature of PBAT/PA6 in-situ microfibrillar composites gradually shifts towards high temperature with the increase of PA6 content.With the increase of PA6 content,the yield strength and tensile elastic modulus of PBAT/PA6 in-situ microfibrillar composites first increases and then decreases,the maximum yield strength and tensile elastic modulus of PBAT-12 specimen are 10.3 MPa and 233.5 MPa,respectively.With the increase of PA6 microfibrils content,the values of storage modulus(G′),loss modulus(G″)and complex viscosity(η*)first increase and then decrease,and the PBAT-12 sample shows the highest G′,G″and η*.

关 键 词：聚己二酸-对苯二甲酸丁二酯 尼龙6 原位微纤 力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]