Basical Study On Synthesis And Application Of Aromatic Polyamide Under Microwave Irradiation

As a new variety of polyamide poly(m-phenyleneisophthalamide) (PMIA) fiber was first prepared in 1962. Because of its excellent thermal and textile-like properties, the fibers and papers made from it have been widely used in industrial and clothes applications. After all it plays an irreplaceable role in the filed of high temperature resistance. With the increasing requirement of high temperature resistance fiber, PMIA is fully developed.Because of hydrogen bonding with the stability, direction and saturation, so intermolecular hydrogen bond interactions aroused closely attention in materials science and life science research, and was crucial to determine the nature and the design of the new complex. From the initial hydrogen bond matrix biology research to the current double-stranded or non-living body folding which used the combination of hydrogen bonds to form the biological characteristics and the non-biological information which can be stored in, study on hydrogen bonding has caused considerable research and developing applications.The ease, speed and flexibility of the microwave method make it ideal for laboratory investigations of polymer synthesis reactions that are traditionally cumbersome and slow. In the present work, microwave-enhanced synthesis of PMIA in NMP solution mixed by TPPi, Py and LiCl was carried out at low temperature and atmospheric pressure via direct polymerization of IPA and MPD, the main two monomers in the PMIA. Factors associated with synthesis performance, such as Phosphorylation Agents, catalyst, reaction time, microwave power and concentration of monomers were investigated. Results showed that microwave irradiation could lower the activation energy of polymerization reaction and significantly shorten reaction time. Combining TPPi and Py as condensing agent efficiently promoted IPA and MPD polymerizing to PMIA. Synthesis rate of PMIA is up to 95.01% under the conditions of reaction time of 6 min at 100℃, microwave power of 600W, TPPi,s dosage of the same to amido,s mol, and Py,s dosage of double to amido,s mol. The process presented is economically feasible for its mild reactions, short reaction time and simpleness to recover polymers. The function principle between TPPi, Py, LiCl and monomers, and the effect of microwave on polymerization were also discussed weightily.Through the study on hydrogen bonds, the paper tried to prepare the non-biological collapse - the aromatic polyamide based on hydrogen bonding by six-step reaction and using different means such as infrared and nuclear magnetic resonance to detect the products.In this paper, besides studying the application of PMIA, also synthesizing a functional material poly(2,5-dibutyloxy)-p-phenylene vinylene(PDBOPV) through bisetherification, chloromethylation and dehydrochlorination reaction. Well-ordered macroporous membranes were fabricated from the material by water droplet templating method in high humidity atmospheres. CS2, CHCl3, benzene, CH2Cl2, THF, toluene were used to fabricate regular honeycomb porous films in different experimental conditions. Moreover, the influences of fabrication conditions, which included the concentration of polymer solutions, properties of solvent, solution storage time, the relative humidity of atmosphere, on pore pattern formations of regular porous films were investigated.