Glass Fiber / Biphenyl Poly (aryl Ether Ketone), High Temperature Composites

In this paper, the glass fiber was treated with various acids and silane coupling agents ,by which ,a novel Poly(aryl ether ketone) composite was produced .This research work was carried out in two stages to prepare glass fiber/Poly(aryl ether ketone) (GF/PAEK) High temperature resistant composite.Stage l:The research of interface property of GF/PAEK compositesDifferent sizing agents were tried to improve the interface adhesion of glass fiber /Poly (aryl ether ketone ) composite,including H2SO4, HC1 and NaOH and different silane coupling agents (KH-550,A-174,M-503 and M-302).The resulted glass fiber was characterized with dynamic capillary tube method ,Fourier Transform Infra-red spectrum(FT-IR) and Scanning Electron Microscope(SEM).The results showed that :the increasing of the non-polar proportion of surface energy improved the wettability of n-hexane.FT-IR determination of glass fibers showed that the reaction between the silicon hydroxyls of glass fiber with those of silane coupling agents improved the adhesion property of GF/PAEK composites . The results also indicate that the surface property of GF and the interface between GF and matrix is affected by different sizing agents , and, the mechanical properties of GF composites are changed as a result.Stage 2:Production of GF/PAEK compositesWith PEEK and biphenyl PAEK as matrix,the high temperature resistant composites were produced in a injection molding machine .The processing condition and crystallization were investigated via optical microscope , Scanning Electron Microscope(SEM) and differential scanning calorimeter(DSC).The results showed that :the length and content of the fiber have obvious effects on the mechanical properties .If the content of the glass fiber is not changed ,the increase of the length of the fiber decreased the end-number of the fives resulting in a decrease of stress concentration point,favorable for the improvement of tensile strength and impact strenth.GF had induction effect on crystallization of PAEK composites ,the content of crystallization and the rate of crystallization were improved with the addition ofA study was also made about the effect of thermal history on melting behavior of bi-phenyl poly (aryl ether ketone)s and its glass fiber composites by using differential scanning calorimeter (DSC).The two samples crystallized and annealed between 320 and 360'C from the fubbery state or from the melt state exhibited a small endotherm peak(T'm) at a temperature above annealing temperature (Tc) and a large endotherm peak(Tm) at 34O℃~400℃.The small endotherm peak was attributed to the melting and recrystallization of the unperfected crystals formed at the Tc.The large endotherm peak was attributed to the melting of the perfect crystals .The results of our study showed that the T'm depended linearly on Tc.The results of our study also demonstrated that bi-phenyl and crystallization play a vital role in heat resistance of the GF/PAEK. The melting point of composites is higher than that of bi-phenyl polymer itself.