Nanoclay modified PMR type polyimide composites were prepared from 3D orthogonal woven basalt fiber performs and
nanoclay modified polyimide matrix resin, which derived from methylene dianiline (MDA), dimethyl ester of 3,3',4,4'-
oxydiphthalic acid (ODPE), monomethyl ester of cis-5-norbornene-endo-2,3-dicarboxylic acid (NE) and nanoclay. The
Na+-montmorillonite was organically treated using a 1:1 molar ratio mixture of dodecylamine (C12) and MDA. The
rheological properties of neat B-stage PMR polyimide and 2% clay modified B-stage PMR polyimide were investigated.
Based on the results obtained from the rheological tests, a two step compression molding process can be established for
the composites. In the first step, the 3D fabric preforms were impregnated with polyimide resin in a vacuum oven and
heated up for degassing the volatiles and by-products. In the second step, composites were compressed. The internal
structure of the composites was observed by a microscope. Incorporation of 2% clay showed an improvement in the Tg
and stiffness of the PMR polyimide. The resulting composites exhibited high thermal stability and good mechanical
properties.
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