Research Article
Soluble Polyimides Bearing Long-Chain Alkyl Groups on Their Side Chain via Polymer Reaction
Table 4
Solubility behavior and water contact angles of polyimides and copolyimides containing phenolic OH groups and these polyimides reacted with 12GA.
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aEquimolar amount of tetracarboxylic dianhydride was used to the total amount of diamines. bEquimolar amount of 12GA was used to the total amount of phenolic OH groups, and the reaction was proceeded using a equimolar amount of DCC as a catalyst. cThe qualitative solubility was determined in the 3 mL of solvent at 5 wt% concentration. S: soluble after standing at room temperature for 12 h; S(h): soluble after heating at 70°C for 12 h; PS: partially soluble after standing at heating at 70°C for 12 h; I: insoluble even after heating at 70°C for 12 h. dWater contact angles (deg) using contact angle meter (CA-D, Kyowa Interface Science Co., Ltd., Japan). |