Novel Soluble Polyimide Containing 4‐tert‐Butyltoluene Moiety: Synthesis and Characterization
Novel Soluble Polyimide Containing 4‐tert‐Butyltoluene Moiety: Synthesis and Characterization
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DOI：
10.1002/cjoc.200990378
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发表时间：
2009-11
影响因子：
5.4
通讯作者：
Chenyi Wang;Guang Li;Jianming Jiang
中科院分区：
文献类型：
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作者：
Chenyi Wang;Guang Li;Jianming Jiang
在合成刚性芳香族二胺α，α-双(4-氨基苯基)-4-(叔丁基)甲苯(1)的基础上，以该二胺单体与4，4‘-氧基二苯二酸酐为原料，通过一步高温缩聚反应合成了一种新型的聚酰亚胺(PI)3。用红外光谱、核磁共振氢谱和元素分析研究了化合物1和3的化学结构，结果表明它们与所提出的结构完全一致。所得PI-3在N-甲基-2-吡咯烷酮、N，N-二甲基乙酰胺、N，N-二甲基甲酰胺、氯仿、二氯甲烷和四氢呋喃等常见溶剂中表现出良好的溶解性。在空气和氮气气氛中，制得的薄膜具有较高的热稳定性，玻璃化转变温度为317℃，失重10%时的温度超过519℃。此外，该薄膜还具有较高的光学透明性、较低的介电常数(1 MHz时为3.13)、较低的吸水率(0.40%)和疏水性。
Based on the synthesis of a rigid aromatic diamine, α,α-bis(4-aminophenyl)-4-(t-butyl)toluene (1), a novel polyimide (PI) 3 was prepared from this diamine monomer and 4,4′-oxydiphthalic dianhydride via a one-step high-temperature polycondensation. FT-IR, 1H NMR and elemental analysis were used to investigate the chemical structures of 1 and 3. The results confirmed that they agreed with the proposed structures for both 1 and 3 completely. The obtained PI 3 showed excellent solubility in most common solvents such as N-methyl-2-pyrrolidinone, N,N-dimethylacetamide, N,N-dimethylformamide, chloroform, dichloromethane and tetrahydrofuran. The resulting strong and flexible film exhibited high thermal stability with the glass transition temperature at 317°C and the temperature at 10% weight loss beyond 519°C in both air and nitrogen atmospheres. Moreover, the film also showed high optical transparency, low dielectric constant (3.13 at 1 MHz), low water absorption (0.40%) and hydrophobic character.