In-situ polymerization preparation method of thermoplastic polyimide prepreg monomer
A polyimide and in-situ polymerization technology is applied in the field of thermoplastic resin-based composite materials, which can solve the problems of difficulty in impregnating fibers, high molecular weight of polymers, and difficulty in removing high-boiling solvents, and achieves low comprehensive preparation cost and simple preparation process. , eliminating the effect of the synthesis process
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[0028] 1. Manual wet method: Add 2mol (1041.0g) of 2,2-bis[4-(3,4-carboxyphenoxy)benzene]propane dianhydride with a purity greater than 99.9% into 2335.0g of absolute ethanol and heat to Dissolve it completely at 78°C, cool to room temperature, add 2mol (216.3g) m-phenylenediamine, and stir for 20min to form a monomer (including both dianhydride monomer and diamine monomer, the same below) mass concentration (the same below) ) About 35% monomer resin solution. will be 2m 2 The CF8652 carbon fiber fabric was treated at 350°C for 5 minutes, and the monomer resin solution was manually painted on the CF8652 carbon fiber fabric. The mass content of the prepreg monomer (including both dianhydride monomer and diamine monomer, the same below) was 38%. ±2% (hereafter, unless otherwise specified, it is the mass content). After most of the ethanol solvent volatilizes, put it in an oven and heat it to 150°C for 10 minutes. The monomers are polymerized into polyamic acid. The polyamic ac...
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