PA6含量对PVC/PA6共混物形态结构与力学性能的影响

以EVA-g-MAH为相容剂,将PVC与自制的低熔点PA6共混制备了PVC/PA6共混物。通过扫描电子显微镜(SEM)和力学性能测试研究了PA6含量对PVC/PA6共混物形态结构及力学性能的影响。SEM分析结果显示:随着PA6含量的增加,PVC/PA6共混物的分散相尺寸逐渐增大,当PA6含量为10%时,共混物中分散相的分散尺寸最小为1μm;当PA6含量为50%时,共混物为两相共连续结构;当PA6含量为60%时,共混物中PA6为连续相,PVC为分散相。力学性能测试结果表明:当PA6含量为10%时,共混物的缺口冲击强度和拉伸强度都较PVC有明显提高,分别提高了约50%与30%,达到了6.29kJ/m2和60MPa。采用差示扫描量热仪(DSC)研究了PVC/PA6共混物的结晶温度,检测结果显示:PVC/PA6共混物呈现非晶结构。

Effects of Content of PA6 on the Morphology and Mechanical Properties of PVC/PA6 Blends

Selecting EVA-g-MAH as compatibilizer,the PVC/PA6 blends were prepared by blending PVC and homemade PA6 with low melting point.The effects of the content of PA6 on the morphology and mechanical properties of the PVC/PA6 blends were studied by using scanning electron microscope(SEM) and mechanical property tests.The SEM results indicated that the scale of dispersed phase of PVC/PA6 blends was increased with the increasing of the content of PA6.When the content of PA6 was 10%,the scale of dispersed phase of the blend was 1μm;when the content was 50%,the structure of the blend was co-continuous;and when the content was 60%,the dispersed phase of the blend was PVC.The mechanical properties tests results indicated that when the content of PA6 was 10%,the tensile strength and Izod impact strength of the blend reached to 6.29kJ/m2 and 60MPa respectively,which increased by 30%～50% than those of pure PVC.The crystallization temperature of the blend was investigated by using DSC,and the results indicated that the PVC/PA6 blend was noncrystalline.