尼龙66纳米碳酸钙复合材料的制备与性能.doc

PAGE  毕 业 论 文 学生姓名： XXXXXX 学 号： 专 业： 高分子材料与工程 题 目： 尼龙66/纳米CaCO3复合材料的 制备与性能 指导教师： 评阅教师： 2012 年 6 月 毕 业 论 文 中 文 摘 要 通过熔融共混法在双螺杆挤出机上制备了尼龙66/纳米CaCO3复合材料，采用扫描电镜（SEM）、偏光显微镜（PLM）、热失重（TGA）和差示扫描量热（DSC）的表征方法研究了纳米碳酸钙对尼龙66/纳米CaCO3复合材料的多晶行为和热性能的影响。结果表明：纳米碳酸钙粒子在尼龙66基体中分散不均，以团聚体的形式存在；纳米碳酸钙具有异相成核作用，能够使球晶的尺寸减小；尼龙66的分解温度为400℃，纳米CaCO3的添加使分解温度降低。同时，DSC测试表明，材料中的β晶型使材料的熔融温度降低；添加在尼龙66基体中的纳米碳酸钙会导致结晶温度的降低和吸热峰半高宽的增加；冷却速率越大，结晶温度越低，结晶温度范围越宽。 关键词 纳米碳酸钙 尼龙66 结晶 冷却速率 毕 业 论 文 外 文 摘 要 Title Preparation and Properties of Nylon 66/nano-CaCO3 Composites Abstract The nylon 66/nano-CaCO3 composites were prepared in a twin-screw extruder by melt compounding. The effect of nano-CaCO3 on the polymorphic behavior and thermal property of nylon 66/nano-CaCO3 composites have been studied using scanning electron microscope(SEM), polarized light microscopy(PLM), thermogravimetric analyzer(TGA) and DSC thermal analysis. It was found that, nano-CaCO3 dispersed in nylon 66 matrix unevenly and exist in the form of aggregates; nano-CaCO3 has the effect of heterogeneous nucleation and decrease the size of the spherocrystal; the decomposition temperature of nylon 66 is 400℃ and the addition of nano-CaCO3 can reduce decomposition temperature. Also, the DSC results indicate that, β crystal leads to decrease the melting temperature of material; the addition of nano-CaCO3 in the nylon 66 matrix leads to decreases of crystallization temperatures and increases of the full width at half maximum of the endothermic peaks; moreover, the faster cooling rate can make the crystallization temperature lower and the range of crystallization temperature wider. Key Words nano-CaCO3 nylon 66 crystallization cooling rate  本 科 毕 业 论 文 第 Ⅰ 页 共 Ⅰ 页 目 录  TOC \o 1-1 \h \z \u  HYPER