The Exploring Research On The Preparation,Nano-Structure And Mechanical Properties Of Molecular Sieves/Polymer Nanocomposite

In this paper, we initiated two methods which monomer or polymer are charged in the pores of MCM-41 to prepare the polymer/MCM-41 nanocomposites, utilizing the marked "shape-selective" "modificable pore walls" and "less stabilization" properties of MCM-41. The engraftion between the polymer and mesoporous molecular sieves is realized in our research.We choose three classical representative polymers : polystyrene, MC nylon6, and Poly Ethylene Terephthalate (PET ) to investigate what the effect of mesoporous molecular sieves on the procedure of polymerization of styrene; the mechanical property of MC nylon6 and the crystallization process of PET.The polymerization of styrene under the constricted geometryof the pores of MCM-41 is carried out with the aim to investigate the effects of the interface and confinement of MCM-41 on the guest polystyrene. We find a great increase of the glass transition temperature of guest polystyrene which influenced by the confined geometry of the pores of MCM-41 used differential scanning calorimetry (DSC).For the MC nylon6/MCM-41 nanocomposite, the silicate pore walls of MCM-41 are exfoliated into nanoscale particles and randomly dispersed in the nylon 6 matrix. The effects of the MCM-41 on thermal and mechanical properties of the MC nylon6/MCM-41 nanocomposites are also investigated. The thermal degradation temperature of the nanocomposite enhanced remarkably with the MCM-41 content reaching to 5 wt%. Similarly, the impact strength is increased about seven times than that of the pure MC nylon6.MCM-41 is also used as the filler material for PET. The effects of MCM-41 on the crystallinity and the rate of crystallization are obtained. Results of the DSC analysis show that the addition of MCM-41 do increase the rate of crystallization of PET. Thecrystallinity of PET/MCM-41 nanocomposite is much higher compared with other fillers.