系统研究了在含2,3,3',4'-联苯四酸二酐(a-BPDA)的聚酰亚胺(PI)泡沫材料体系中,计算相对分子质量、二胺分子结构、二酐分子结构对聚酰亚胺泡沫材料性能的影响.研究发现,对于a-BPDA/m-PDA/NA体系,计算相对分子质量为1500时,可以制备得到性能优良的硬质耐高温聚酰亚胺泡沫材料,其玻璃化转变温度高于350℃,闭孔率大于88％,压缩强度为1.34 MPa.在该体系中,部分引入ODPA,可提高材料的韧性;当n(BTDA):n(a-BPDA)=5:5时,泡沫材料不但拥有高的耐热性能和力学力学性能,同时还具有良好的韧性.
The influences of calculated molecular weight,different diamines and different dianhydrides on properties of 2,3,3',4'-biphenyltetracarboxylic dianhydride (a-BPDA)-added polyimide foam were studied.The results show that a-BPDA/m-PDA/NA system can provide excellent high-temperature resistant rigid polyimide foam with a calculated molecular weight of 1500 g/mol.The foam has high glass transition temperature (＞350 ℃;),high closed-cell content (＞88％) and high compressive strength (1.34 MPa).Moreover,partly introducing ODPA into the above system can increase foam toughness.When the mole ratio of BTDA to a-BPDA is 5:5,the foam not only shows good mechanical and thermal performance,but also outstan.ding toughness.
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