摘要本篇论文主要通过本体法，研究制备了发泡均匀的聚甲基丙烯酰亚胺（PMI）泡沫 塑料。首先以甲基丙烯酸（MAA）、丙烯腈（AN）为主要单体，用偶氮二异丁腈（AIBN）作为引发剂，用丙烯酰胺（AM）作为交联剂，用甲酰胺作为发泡剂，用碳 酰胺作为成核剂，通过本体聚合的方法制备出 MAA/AN 共聚物，然后进行发泡制得 PMI 泡沫塑料。然后用光学显微镜和扫描电子显微镜（SEM）观察了泡孔结构，用傅 里叶红外光谱（FTIR）分析了 PMI 共聚发泡过程中的分子结构变化，并用万能拉伸试 验机测试了泡沫的压缩性能，最后分别用动态热机械分析（DMA）、差示扫描量热仪 法（DSC）、热失重分析（TGA）以及热变形温度测试（HDT）研究了 PMI 泡沫塑料 的热性能。83365

研究结果表明：58 份 AN、42 份 MAA、2~3 份丙烯酰胺、0。2~0。3 份 AIBN、5 份甲 酰胺、2 份碳酰胺的配方组成，可以制备出发泡均匀的 PMI 泡沫塑料；泡孔均为闭孔 结构，大小均一。共聚物在发泡过程中生成了酰亚胺环状结构，以及一小部分的酸酐 结构和少部分的梯形结构；PMI 泡沫塑料的压缩屈服应力为 1。319 MPa，压缩强度为 1。591 MPa，压缩时泡孔由外及内逐层破坏；DMA 和 DSC 所测 PMI 泡沫塑料的玻璃化 温度  分别为 178   和 225   。PMI 泡沫塑料的热变形温度（HDI）为 211 。TGA 分析 PMI 泡沫塑料的热分解温度为 315  。

毕业论文关键字：聚甲基丙烯酰亚胺；泡沫塑料；制备；性能

Abstract In this paper, we mainly study the preparation of foam-uniform polymethacrylimide (PMI) foam plastic。 First, using methacrylic acid (MAA) and acrylonitrile (AN) as main monomers, with azobisisobutyronitrile (AIBN) as initiator, acrylamide (AM) as crosslink agent, formamide as foaming agent, carbonamide as nucleating agent, by bulk polymerization prepared MAA/ AN copolymer, then foaming become PMI foam plastic。 Then, the cell structure was observed by optical microscope and a scanning electron microscope (SEM), by Fourier transform infrared spectroscopy (FTIR) analysis the molecular structure changes in the foaming process of PMI copolymerization, and also test the foam compression performance。 Finally, the dynamic mechanical thermal analysis (DMA), differential scanning calorimetry (DSC), thermal gravimetric analysis (TGA) and heat deformation temperature (HDT) test to study the thermal properties of PMI foam on a universal tensile testing machine。

The results of the study show that: the prescription containing 58 phr。AN , 42 phr。MAA , 2~3 phr。AM , 0。2~0。3 phr。AIBN , 5 phr。formamide , 2 phr。carbonamide can be prepared

foam-uniform PMI foam plastics ; The foam cell are closed, uniform size。 In the foaming process of the copolymer generates the cyclic hexahydroxy imide structure, less part of the ladder structure and the acid anhydride structure; The compression yield stress of PMI foam plastic is 1。319MPa, and the compression strength is 1。591MPa, PMI foam plastic is damaged from outside to inside layer by layer; The glass transition temperature  of PMI foam plastic measured by DMA and DSC are 178   and 225    , respectively。 The HDI of PMI foam plastic is 211 。 The thermal decomposition temperature of PMI foam plastic is 315    。

Keywords: Polymethacrylimide；Foamed plastics；Preparation; Performance

目 录

第一章 绪论 1

1。1  泡沫塑料 1

1。1。1  泡沫塑料的分类 1

1。1。2  泡沫塑料的成型原理 1

1。1。3  泡沫塑料的制备方法