摘要由于聚苯乙烯微孔材料具有质量轻、冲击强度高、韧性好、隔音隔热性能优异等特点，在汽车、建筑、包装等行业被应用广泛。因此，开展聚苯乙烯微孔材料的制备及性能研究对推动行业发展具有一定的指导作用。聚苯乙烯（PS）是发泡研究的理想对象，而超临界二氧化碳（CO2）具有临界温度和临界压力低的特点（Tc=31.5℃,Pc=7.3MPa），是理想的发泡剂。本文通过单因素变量法、正交实验设计及对比实验的方法，采用了扫描电子显微镜（SEM）和动态热机械分析仪（DMA）对PS发泡的最佳工艺进行探讨，并研究了发泡温度、发泡压力和保压时间对材料泡孔孔径和泡孔密度的影响。研究表明：发泡压力的影响最为重要；且使用纳米CaCO3改性PS后，其发泡性能得到了明显改善，可以制得泡孔平均孔径在1~10μm、泡孔密度达109个/cm3的微孔材料。21971
关键词 聚苯乙烯微孔材料 超临界CO2 泡孔孔径 泡孔密度
毕业论文设计说明书（论文）外文摘要
Title Preparation and mechanical properties of polystyrene microporous materials
Abstract
As the microporous materials have light weight, high impact strength and toughness, good sound insulation properties, etc., it is widely applied in motor, construction and package. Therefore, an investigation of microporous materials has a promotion effect on the development of the plastic manufacturing industry. Polystyrene (PS) is an ideal object of laboratory foaming research, and the supercritical dioxide has low critical temperature and critical pressure (Tc = 31.5 ℃, Pc = 7.3MPa), making it being an ideal foaming agent. In this paper, single factor variables, orthogonal experimental design and comparison were used for discussions. Scanning electron microscope (SEM) and dynamic mechanical analysis (DMA) were utilized to obtain the optimum of PS foam and to investigate the effect of foam temperature, foam pressure and holding time on cell diameters and cell densities of foamed materials. It has shown that the effect of foam pressure is important and that the use of nano CaCO3 modified PS significantly improves foaming properties, whose average pore size reaches 1 ~ 10μm and the cells densities is 109 / cm3.
Keywords polystyrene microporous materials supercritical dioxide cell average diameters cell densities
目 次
1 引言 1
1.1 课题研究的背景 1
1.2 超临界CO2的特性及其作用 2
1.3 聚苯乙烯微孔材料 3
1.3.1 使用纳米填充改性聚苯乙烯微孔材料 3
1.3.2 超临界CO2用于聚苯乙烯微孔材料的制备 4
2 聚苯乙烯微孔材料制备的工艺研究 5
2.1 实验 5
2.1.1 主要原料 5
2.1.2 主要仪器和设备 5
2.1.3 PS复合材料的制备 6
2.1.4 聚合物发泡材料的制备 7
2.2 实验设计 8
2.2.1 单因素实验 8
2.2.2 正交实验 9
2.2.3 对比实验 9
2.3 聚合物发泡材料的测试与表征 10
2.3.1 发泡倍率的测定 10
2.3.2 SEM表征 10
2.3.3 DMA测试 11
3 结果与讨论 12 聚苯乙烯微孔材料的制备及性能研究:http://www.751com.cn/huaxue/lunwen_14421.html