A Study On Structure And Properties Of Poly (Phthalazinon Ether Sulfone Ketonl)/ Nylon 6 In Situ Composite Via The Anionic Ring-Opening Polymerization

With development of modern science and technology, polymer materials are required more and more rigorously. Polymer blending is an important way to achieve high performance materials. In situ polymerization is a fair perfect method to prepare polymer blend, which is simple and can avoid the phase separation to gain the higher level dispersion. In this paper, PPESK/ nylon 6 composites were obtained by in situ anionic polymerization, basing on PPESK able to dissolve homogenously in the e-caprolactam melt. Interaction between PPESK and caprolactam, caprolactam-Na was studied. The dispersion state of PPESK in nylon6 matrix was also characterized. Furthermore, the crystallization behavior, melting behavior, crystalline structure, thermal stability, mechanical properties of PPESK/nylon6 in situ composites were investigated. The main results are summarized as follows:1. FTIR results showed there was hydrogen bonding interaction between PPESK & caprolactam, PPESK & caprolactam-Na. PPESK may disperse homogenously in nylon 6 matrix as displayed by SEM morphology observation.2. WAXD study indicated pure nylon 6 and in situ composites appeared in a form, While quenched from the melt, MC nylon 6 and in situ composites existed in y form. The quenched samples possessed both a form and y form after annealed at 200°C for two hours. In situ composites favored y form transformation into a form of the matrix MC nylon 6 due to the existence of PPESK.3. Iodine treatment results showed PPESK hindered crystal form transition of matrix nylon 6 due to interaction between PPESK and nylon 6.4. isothermal and Non-isothermal crystallization and melting behavior showed there was interaction between PPESK and nylon 6 matrix, in one way, PPESK as nuclear reagent accelerated the crystallization rate of nylon 6 and improved the melting point of in situ blending materials, in the other way, the interface interaction between PPESK and nylon6 lead to the accretion of crystal activation energy of PPESK/nylon6 in situ composites. The corresponding melting behaviors of composites were attributed to recrystallization and reorganization.5. thermal stability of in situ composites was improved and moisture absorption was amended due to interaction between PPESK and nylon 6 matrix. meanwhile, the strength and toughness of MC nylon6 simultaneously enhanced when PPESK was well dispersing in nylon6 matrix.