论文部分内容阅读
以聚乳酸(PLA)为基体,热塑性聚氨酯(TPU)为增韧相,改性云母(Mica)为增强相,利用挤出熔融混合法制备了一系列PLA/TPU/Mica复合材料。采用扫描电子显微镜、广角X射线衍射仪、差示扫描量热仪和维卡软化仪测试了复合材料的形态、结晶性能和热性能。结果表明:添加2.5%的Mica后,PLA/TPU共混物的结晶度下降了2.77%,热变形温度提高了6.7℃;同时,改性后的Mica具有良好的分散形态,当2.5%的Mica经硅烷偶联剂改性后,其共混物结晶度仅下降了1.06%,热变形温度提高了8.5℃;与钛酸酯偶联剂改性的Mica相比,硅烷偶联剂改性的Mica能够更好地改善共混物的耐热性。
A series of PLA / TPU / Mica composites were prepared by extrusion melt blending method using polylactic acid (PLA) as matrix, thermoplastic polyurethane (TPU) as toughening phase and modified mica as reinforcing phase. The morphology, crystallinity and thermal properties of the composites were tested by scanning electron microscopy, wide angle X-ray diffractometry, differential scanning calorimetry and Vicat softener. The results showed that the crystallinity of PLA / TPU blends decreased by 2.77% and the heat distortion temperature increased by 6.7 ℃ after adding 2.5% Mica. At the same time, the modified Mica had good dispersion morphology. When 2.5% Mica The silane coupling agent modified, the blend crystallinity decreased by only 1.06%, heat distortion temperature increased by 8.5 ℃; Compared with the titanate coupling agent modified Mica, the silane coupling agent modified Mica can better improve the heat resistance of the blend.