The Study On Synthesis Of Tetrahydrofuran Copolyether And Modified Magnesium Hydroxide Filled Polypropylene

THF/PO copolyether P(THF-co-PO) has characteristied with high mechanical strength, excellent chemical resistance and low temperature performance, The P(THF-co-PO) was an important intermediate for synthesis of polyurethane elastomers, polyurethane and other polymer materials, which has been widely used. Conventional catalytic synthesis of the P(THF-co-PO) using protonic, such as concentrated sulfuric acid, perchloric acid, which exists corrosion of equipment, unsafe operation, the product was washed with a large amount of water caused environment pollution and other disadvantages. It is necessary to develop new catalysts instead of the conventional catalysts to overcome the above drawbacks. Solid acid catalysts causing widespread concern owning to its reusability, environment-friendly. In this paper, solid acid as catalyst prepared catalytic synthesis of the P(THF-co-PO). PP filled with MH, which modified by the prepared the P(THF-co-PO).Solid acid SO42-/TiO2/MoO3 modified by the fourth cycle of metal ions Cr6+, Mn4+, Fe3+, Co2+, Ni2+, Cu2+ and Zn2+ the sixth cycle of metal ions Ta5+, W6+and Pb2+ and the lanthanide metal ions La3+, Ce2+ and Sm3+ was prepared by impregnation-precipitation method. The P(THF-co-PO) with different monomer ratio was catalyzed by the prepared solid acid catalysts. The study to investigate the effect of the P(THF-co-PO) conversiton on amount of catalysts, reaction time, reaction temperature and molar ratio of tetrahydrofuran (THF) and propylene oxide (PO). The structure characterization was examined by X-ray diffraction (XRD), N2 adsorption-desorption, scanning electron microscope (SEM) and transmission electron microscopy (TEM). The acidic of the solid acids were characterized by FT-IR of adsorbed pyridine (Py-FTIR) and temperature programmed desorption of ammonia (NH3-TPD). The P(THF-co-PO) product was characterized by Fourier transform infrared spectroscopy (FT-IR) and H NMR spectroscopy (’H-NMR) method. The results showed that SO42-/TiO2/MoO3 modified by W6+ catalytic synthesis of the P(THF-co-PO) with the highest conversion, which reached 71.43%. The conversion has not significantly reduced after the catalyst was reused three times.MH surface modified by the P(THF-co-PO), the degree of dispersion and surface properties of MH was analyzed by using oil absorption, SEM, FT-IR, XRD, The P(THF-co-PO)can be effectively coated on MH surface with the amount of 2%. PP filled with modified MH, research the influence of the modified MH filling volume on the tensile strength, impact strength, rheological properties, crystallization properties and microstructure. Results showed that hydrogen bonds can form between the P(THF-co-PO) and the surface hydroxyl groups of MH, and also can be compatible in PP. MH well dispersed in the PP and agglomeration does not occur. The impact strength of PP filled with MH was decreased after an initial increase, the tensile strength showed a downward trend, MH modified by the P(THF-co-PO) exhibited good performance compared with PP filled with unmodified MH.