Study On Polysulfone/MC Nylon 6 In Situ Blending System

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 be varied in many techniques. In this paper, polysulfone/MC nylon 6 in situ blending materials were obtained by in situ anionic polymerization, basing on caprolactam melt is a good solvent for polysulfone which may dissolve homogenously in the caprolactam melt. Interaction between polysulfone and caprolactam was studied. Structure, morphology and property of in situ blending materials were characterized by all kinds of test technology, which primarily illustrates the relationship between structure and property. The main results are summarized as follows:1. FTIR results showed there was hydrogen bonding interaction between polysulfone and caprolactam. Polysulfone may disperse homogenously in MC nylon 6 as displayed by SEM morphology observation.2. Iodine treatment results showed polysulfone hindered crystal form transition of MC nylon 6, thus suggesting interaction between polysulfone and MC nylon 6.3. WAXD study indicated MC nylon 6 and in situ blending materials appeared in a form, but the two diffraction peaks moved in high angle direction, implying hydrogen bonding interaction between polysulfone and MC nylon 6. While quenched from the melt, MC nylon 6 and in situ blending materials existed in y form. The quenched samples possessed both a form and y form after annealed at 150℃ for two hours. In situ blending materials favored y form transformation into a form of the matrix MC nylon 6 due to the existence of polysulfone.4. Non-isothermal crystallization and melting behavior showed there was interaction between polysulfone and MC nylon 6, thus reduced the crystallization rate of MC nylon 6 and improved the melting point of in situ blending materials, while there was almost no interaction between polysulfone and nylon 6 after treatment by solution blending-deposition method.5. Thermostability of in situ blending materials was improved due to interaction between polysulfone and MC nylon 6.6. Mechanical properties and destroying morphology showed tensile strength of in situ blending materials changed little, while tensile modulus, bending strength and modulus improved, but elongation at break and notched impact strength declined as compared with pure MC nylon 6.