3,3',4,4'-ベンゾフェノンテトラカルボン酸二無水物

外観

白色〜黄色, 結晶〜粉末

溶解性

ジメチルアセトアミド, DMFに易溶。THF, アセトンに可溶。アセトンに溶け、水にほとんど溶けない。

用途

高機能性ポリマー用原料モノマー、熱変形温度向上用エポキシ樹脂架橋硬化剤。アルキド樹脂、ポリエステル、ポリ(イミド-イミダゾール)などの耐熱性樹脂の原料、耐熱可塑剤原料

主な用途／役割

エポキシ樹脂の硬化剤として使用される。

使用上の注意

不活性ガス封入

化学的特性

white crystall powder

使用

BTDA is important monomer of polyimide, and used for production of polyimide material.

一般的な説明

Benzophenone-3,3′,4,4′-tetracarboxylic acid is formed by hydrolysis, it can be converted to the dianhydride by treating with Ac₂O (molar ratio 4 to 1 of acid).The dianhydride is used to synthesize polyimides, which are highly flexible in nature due to the presence of keto and carbonyl groups in the dianhydride molecule. The keto and carbonyl groups subsequently increase the spacing between the imide rings enhancing the solubility and processibility.

純化方法

The main impurity is the free acid formed by hydrolysis (check for OH bands in the IR). This can be converted to the dianhydride by treating with Ac2O (molar ratio of 4 to 1 of acid), heating at 110-120o for 1.5 to 2hours, cooling to 0—5o and collecting the dianhydride. This is then dissolved in hot dioxane or Me2CO, filtered and cooled to 10—15o. The moisture sensitive solid is collected and dried at 120—130o in vacuo. It has been sublimed at high vacuum. [Faberov et al. J Org Chem USSR 4 153 (English translation) 1968.]