High solubility and optical transparency of novel polyimides containing 3,3′,5,5′-tetramethyl pendant groups and 4-tert-butyltoluene moiety
High solubility and optical transparency of novel polyimides containing 3,3′,5,5′-tetramethyl pendant groups and 4-tert-butyltoluene moiety
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DOI：
10.1016/j.polymdegradstab.2009.04.032
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发表时间：
2009-09
影响因子：
5.9
通讯作者：
Chenyi Wang;Xiaoyan Zhao;Guang Li;Jianming Jiang
中科院分区：
文献类型：
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作者：
Chenyi Wang;Xiaoyan Zhao;Guang Li;Jianming Jiang
以3，3 '，5，5'-四甲基-4，4 '-二氨基联苯-4'-叔丁基甲苯（1）与四种芳香族二酐为原料，通过一步高温缩聚反应制备了一系列新型聚酰亚胺（3a-d）。所得聚酰亚胺具有优异的溶解性，在大多数酰胺极性溶剂和氯化溶剂中的溶解度为10wt%。它们的薄膜几乎是无色的，并且表现出高的光学透明度，其中UV截止波长在322-350 nm的范围内，80%透明度的波长在395-414 nm的范围内。它们还显示出低介电常数（在1 MHz下为2.72-2.91）和低吸水率（0.37-0.62%）。此外，这些聚酰亚胺具有高的玻璃化转变温度（Tg）（高于321 °C）和良好的热稳定性，在氮气气氛中10%重量损失温度在526-547 °C的范围内。与不含3，3 ′，5，5 ′ -四甲基侧基的类似聚酰亚胺相比，所得聚酰亚胺3a-d具有更好的溶解性、更高的光学透明性和更低的介电常数。
A series of novel polyimides (3a–d) were prepared from 3,3′,5,5′-tetramethyl-4,4′-diaminodiphenyl-4”-tert-butyltoluene (1) with four aromatic dianhydrides via a one-step high-temperature polycondensation procedure. The obtained polyimides showed excellent solubility, with the dissolvability at a concentration of 10 wt% in most amide polar solvents and chlorinated solvents. Their films were nearly colorless and exhibited high optical transparency, with the UV cutoff wavelength in the range of 322–350 nm and the wavelength of 80% transparency in the range of 395–414 nm. They also showed low dielectric constant (2.72–2.91 at 1 MHz) and low water absorptions (0.37–0.62%). Moreover, these polyimides possessed high glass transition temperatures (Tg) (above 321 °C) and good thermal stability with 10% weight loss temperatures in the range of 526–547 °C in nitrogen atmosphere. In comparison with the analogous polyimides non-containing 3,3′ ,5,5′ -tetramethyl pendant groups, the resultant polyimides 3a–d showed better solubility, higher optical transparency and lower dielectric constant.