A Study On Structure And Properties Of Poly (Phthalazinon Ether Sulfone) (PPES)/MC Nylon 6 In-Situ Composites

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 composite. In-situ polymerization was a new method to prepare polymer/polymer composite. It created the rigid macromolecular with the matrix at the same time, blended the two polymers homogeneously, avoided the tendency of the phase separation between the macromolecules to the most and gained the higher level dispersion. In addition, its techniques was easier and it conquered the limitation of generic preparation methods such as melt blend and solution blend. It has not been reported to prepare the poly(phthalazinon ether sulfone) (PPES)/MC nylon 6 composite via in-situ anionic polymerization so far. On the basis of PPES able to dissolve in the ε-caprolactam melt, PPES/MC nylon 6 in-situ composite was successfully obtained via anionic polymerization. The interaction between PPES & e-caprolactam , PPES & s-caprolactam-NaOH were studied in detail. The dispersion state of PPES in MC nylon 6 was also characterized. Furthermore, the crystallization behavior, melting behavior, crystalline structure, thermal stability, mechanical properties as well as failure morphology of PPES/MC nylon 6 composites were investigated. Meanwhile, the effect of PPES on structure and properties of PPES/MC nylon 6 in-situ composites was illustrated compared to pure MC nylon 6. The main results were summarized as follows:1 .There existed hydrogen-bonds interaction between PPES & ε-caprolactam, PPES & e-caprolactam-NaOH, and the interaction between PPES & e-caprolactam-NaOH stronger than that of the PPES & e-caprolactam. SEM photographs showed PPES well dispersed in MC nylon 6 matrix. With the content of PPES increasing, the interactive points between PPES and MC nylon 6 enhanced; the total interaction between them improved, however, the aggregation effect became stronger, causing bigger phase section.2.Nonisothermal crystallization results indicated: The interaction of hydrogen-bonds between PPES and MC nylon 6 hindered the crystallization of MC nylon 6; the melting behaviors of composites corresponded to the melt of the crystalline with different perfect level, attributing to the recrystallization and reorganization.