Modification Of Poly (Phthalazinone Ether Ketone)s And Poly (Phthalazinone Ether Sulfone)s

Poly(phthalazinone ether ketone)s (PPEKs) and Poly(phthalazinone ether sulfone)s (PPES)s, a series of novel high performance polymers developed by our research group, have much better thermal resistance and solubility ; than similarhigh performance polymers, therefore, have a strong competitive capability in international markets and will be extensively used. Like most of high performance polymers, melting processability of PPEKs and PPESs should be improved because of their high melting viscosities.Poly(phthalazinone ether ketone)(PPEK), poly(phthalazinone ether ketone ketone) (PPEKK) and poly(phthalazinone ether sulfone)(PPES) were modified by blending with poly(ether imide)(PEI). The structures and properties of PPEK/PEI, PPEKK/PEI, PPES/PEI blends were investigated Phase behaviors of these blends were studied using ternary-solution methods, differential scanning calorimetry (DSC) and scanning electron microscopy(SEM). The results show that PPEK/PEI and PPEKK/PEI blends are miscible in all compositions and PPES/PEI blends are not miscible but compatible. The FT-IR results yield evidence that physical interactions leading to miscibility or compatibility of these blends are weak and no apparent specific interactions exist between two polymers in the blends. Therefore, the miscibility of PPEK/PEI blends could be contributed to the lower repulsion between the two constituent polymers. Uniform film samples with different compositions of these blends were prepared through blend solution and tensile properties of these film samples have apparent positive relationships with compositions. In addition, thermogravimetric analysis and rheological properties of PPEK/PEI blends were studied. The results indicate that the blends have excellent high-temperature resistance and better melting processability than that of pure PPEK.Different composition PPEKK/Poly(phenylene sulfide)(PPS) blends were prepared by solution blending. Miscibility of PPEKK/PPS blends was investigated using DSC. The blends show considerable miscibility. FT-IR study indicates that no specific interactions of two constituents making PPEKK/PPS blends miscible exists. The crystallization of the blendsinAbstractwere investigated by wide angle X-ray diffraction (WAXD) and polar light microscope (PLM). The results show that PPEKK in the blends deforms the crystallization of PPS but don't change its crystal structure. Thermogravimetric analysis shows PPEKK/PPS blends have excellent thermal resistance. Rheological properties of the blends were measured using a Shimadzu AG-2000A capillary rheometer at temperature of 310癈, 320癈, 330癈 and 340癈. The results show that the melting viscosities of blends decrease with the increase of PPS content, temperature and shear rate. The melting blends are psedoplastic fluids and the non-Newtonian indexes increase with increasing the weight content of PPS in the blends. The studies on the die swell ratios and morphology of the extruded strands show that blending with PPS improves the appearance of PPEKK.Two blends, PPEKK/PA66 and PPEK/PA66, were prepared by solution blending. Phase behaviors of PPEKK/PA66 blends were investigated by DSC and SEM. The blends show bad miscibility. Thermogravimetric analysis of PPEKK/PA66 blends were studied, the results show that the blending of PA66 considerably decrease the high-temperature resistance of PPEKK. The crystallization of PPEKK/PA66 and PPEK/PA66 blends were investigated by DSC and WAXD. The results show that PPEKK and PPEK in the blends deforms the crystallization of PA66 but don't change its crystal structure. Rheological properties of the blends were studied. The results show that the melting processability are considerably improved by blending with PA66.Different composition PPEK/BPA-polycarbonate(PC) and hydroquinone-copoly (phthalazinone ether ketone)(HQ-PPEK)/PC blends were prepared by solution blending. Phase behaviors of these blends were investigated using ternary-solution methods, DSC, SEM and FT...