聚双马来酰亚胺的合成及改性的研究

Study on the Synthesis and Modification of Polybismaleimide

以3,3′-二乙基-4,4′-二胺基二苯甲烷(DEDADPM)、均苯四甲酸二酐(PMDA)、顺丁烯二酸酐(MA)为原料采用化学亚胺化法合成了马来酰亚胺预聚体,用邻苯二甲酸二烯丙酯(DAP)和无机组分(铝溶胶)对其改性。利用红外光谱(FT-IR)、扫描电子显微镜(SEM)对其结构及界面形态进行了分析;同时采用拉力试验机对其拉伸强度进行了测试;对其介电性能(介电常数ε、介电损耗tanδ)和热分解温度也进行了分析及比较。结果表明亚胺化时间越长亚胺化越完全;铝溶胶很好的分散于体系中形成交联网络;交联剂(DAP)的引入使薄膜的韧性有较大提高,较原膜约提高80%,而加入铝溶胶使其拉伸强度有一定程度的降低,但仍比原膜高;由于DAP及铝溶胶的引入使得介电常数ε有所提高,介质损耗tanδ降低,同时热分解温度也有所提高。

Bismaleimide oligomer was synthesized by chemical imidization method-3, 3＇ -diethyl-4, 4＇ -diamino diphenyl methane, pyromellitic anhydride and maleic anhydride, and was modified by DAP and inorganic contents（aluminum sol）. The structure and surface morphology of this modified polymer were characterized by infrared spectra （FT-IR） and scanning electron microscope （SEM）, its tensile strength was tested by pulling experimental machine; its dielectric properties （including dielectric constants ~, dielectric loss tan δ） and heat decomposition temperature were compared. The results showed that time of imidization was longer, the imidization was more complete, the aluminum sol was finely dispersed in the system and formed cross-linking network. The cross-linking agent （DAP） would increase the tensile strength about 80%. Aluminum sol would decrease the tensile strength a little, but higher than the primary film. DAP and aluminum sol would increase dielectric constant ε and decrease dielectric loss tan δ a little, and increase the heat decomposition temperature some.