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Chiral polyamide-imide is a new type of thermal stability of the polymer , can be widely used in microelectronic devices , aerospace and automobile manufacturing industry and other fields . Two types of paper chiral synthetic polyamide-imide . First, with glacial acetic acid as a solvent , pyromellitic dianhydride (PMDA) respectively, and L-alanine , L- phenylalanine , L- leucine , L- isoleucine, L-valine was synthesized five chiral imide monomers , and then N-methylpyrrolidone (NMP) as solvent , xylene (PX) as the azeotropic agent , synthesized in five chiral imide monomer and diphenyl methane diisocyanate (MDI) is prepared by reacting the chiral polyamideimide Ⅰ. Chiral Synthesis of polyamide-imide Ⅱ glacial acetic acid using the same as a solvent , pyromellitic dianhydride (PMDA) respectively, and L-alanine , L- phenylalanine , L- leucine , L- iso- leucine L-valine was synthesized five chiral imide monomer then made into acid chloride , with the amino acid chain extension reaction , and the final diphenyl diisocyanate reacted to obtain chiral poly amide -imide Ⅱ. On the preparation of a chiral imide monomer optimal reaction conditions and the ratio of raw materials are discussed, and its reaction mechanism was studied . Monomer by infrared spectroscopy, nuclear magnetic resonance products were characterized . Two classes of chiral structure and properties of polyamide-imide . Polymers by infrared spectroscopy , differential scanning calorimetry instrument, integrated thermal analyzer chiral polymers were characterized . Chiral technology is based on the rise of science . Despite some achievements , but further efforts. Especially in the synthesis mechanism and further direction to the synthesis of biological substances develop chiral chiral polymer applications, and the relationship between the structure and other aspects of the research is to be further improved.
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