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Eutectic Mixture of Bismaleimides Containing Polymethylene Flexible and Aramide-Arylate Mesogen Groups

Pham Quang Trung, Pham Hong Duc, Lo Tuan Son, Truong Thanh Tu and Nguyen Minh Ngoc

The binary mixture has been developed from the two-pure liquid crystalline bismaleimides (BMIs) containing polymethylene flexible and aramide-arylate mesogen groups, using the Shroder-Van Laar equation. Differential scanning calorimetry (DSC) analyses show the relationship between melting and volubility of each constituent of the binary system via the different liquid and solid phases. The concept of a eutectic mixture having special thermal properties has thus been demonstrated. The eutectic melting temperatures are much lower than either of the pure constituents, making it easier to use these monomers in molten state. In addition, the eutectic mixture improves the crosslinking conditions by increase fluidity of the binary mixtures and maintains its fluidity before hardening. In these systems, the two monomers can combine to form the liquid crystal state after a crosslinking reaction, as shown on polarized light microscopy.