摘要相较于其他聚合物，PP具有许多优点。但由于其发泡区间小，因此采用与PE共混发泡来研究其发泡工艺。本文利用超临界CO2制备PP/PE共混物的发泡材料，发泡方法为快速泄压法。研究了温度、保压时间、组分比等工艺因素对PP/PE发泡产物的密度、发泡倍率、泡孔形态、平均孔径和泡孔密度的影响，分别采用排乙醇法测体积、扫描电镜（SEM）对聚合物表观形态和泡孔形态进行了表征。相比于其他研究，本文着重研究的是PP/PE共混物的发泡工艺，重点在于温度等的影响，而非共混物组分比不同对发泡的影响。研究表明：合适的温度对获得理想的PP/PE共混物发泡的发泡倍率、泡孔形态、平均孔径、泡孔密度等性质有重要影响。64167

毕业论文关键词   PP/PE共混物发泡  超临界CO2  发泡温度  泡孔形态

毕业设计说明书（论文）外文摘要

Title The Research of Polypropylene / Polyethylene Blends Foam Using Supercritical Carbon Dioxide As A Blowing Agent                                                                      

Abstract

Compared to other polymers, PP had many advantages. Because of its small foam interval, PE was blended into PP to study the foaming process. Supercritical CO2 was used as a blowing agent in the preparation of PP / PE blends foamed material in this thesis, with the quick relief foaming method. The effects of changes of temperature, dwell time, composition ratio and other technological factors on the density, expansion ratio, foam morphology, average pore diameter and cell density of PP/PE foam products had been characterized by measuring volume with rowing of ethanol, SEM. Compared to previous studies, this article focuses on the study of PP/PE blends foaming process, focusing on the impact of temperature, rather than the difference of blend components to the foam. It was shown in this study that: an appropriate temperature was significant to get an ideal result of the expansion ratio, foam morphology, average pore diameter and cell density of PP/PE blends foaming.

Keywords  PP/PE blends foam   Supercritical CO2   Foaming temperature Foam morphology

1  绪论 1

1.1  课题研究背景 1

1.2  超临界CO2及发泡概述 1

1.3  PP、PP/PE发泡材料 2

1.4  本课题主要研究内容 4

2   实验部分 5

2.1  实验 5

2.1.1  实验原料 5

2.1.2  主要仪器和设备 5

2.1.3  PP/PE共混物材料的制备 6

2.1.4  PP/PE 发泡材料的制备 6

2.2  测试和表征 9

2.2.1  宏观结构 9

2.2.2  微观结构 10

2.2.3  PP/PE样品结晶性能的测试 11

3  结果与讨论 12

3.1  PP/PE共混物 12

3.2  单因素变化法研究PP/PE共混物的发泡工艺 12

3.2.1  保压时间对材料密度的影响