Study On The Compatibility Of Fluororesin/PMMA Blends

In this paper, the compatibility, thermal performance, mechanical properties of the Poly(vinylidene fluoride)(PVDF)/Poly(methyl methacrylate)(PMMA) blends and the Tetrafluoroethylene- Hexafluoropropylene- vinylidene fluoride ternary-copolymer(THV)/ Poly(methyl methacrylate) blends were studied. The development situation of Fluororesin, PMMA and the blending modification, contour machining of polymer were introduced.PVDF and PMMA were blended by melting blend. The influence of composition on the rheological properties, thermal performance and mechanical behavior of the PVDF/PMMA blends were investigated. The compatibility of blend system was forecasted and studied by theoretical calculation and dynamic mechanical analysis(DMA) respectively. The composition showed effect on the balanced torque of the blends. When the PVDF content increased, the notched impact strength was improved. But the bending strength,tensile strength and modulus of elasticity reduced. All of the PVDF/PMMA blends with different composition presented one glass-transition temperature(Tg). The Tg of blend moved to the side of the Tg of pure PMMA with the increament of PMMA. And the peak value of internal friction( tan?) was higher and did not change obviously. So the two constituents were compatible.THV/PMMA blends with different proportion were prepared by the same way. The influence of composition on the rheological properties, dynamic mechanical behavior and thermal performance of THV/PMMA blends was investigated. The composition showed little effect on the balanced torque and temperature of the blends. The crystallization of THV and the glass-transition behavior of PMMA resin were insignificantly affected by the composition of the blends. The melting behavior of the blends changed gradually between the typical melting behavior of the two different constituents. All of the THV/PMMA blends with different composition presented two Tg which corresponded to the position of glasstransition temperature(Tg)of the two constituents. PMMA sphere particles in the continuous THV phase in blends were observed, and the particles diameter of dispersed phase was 1~10μm. The two constituents were incompatible.