PA6含量对PVC/PA6共混物形态结构与力学性能的影响

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

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。

Selecting EVA-g-MAH as compaUbilizer, 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 PVCIPA6 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 llJm; 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 6.29k Jimz 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 PVCIPA6 blend was noncrystalline.