The Study Of Low Surface Energy ABS Resin And Glass Fiber Reinforced Modified ABS Composites

In this paper, low surface energy and high water resistance acrylonitrile- butadiene- styrene-terpolymer（ABS） and its glass fiber reinforced composites （GFRABS） were prepared by reactive extrusion in twin-screw extruder. In this reaction, dicumy peroxide（DCP）was used as radical initiator, styrene（St）was used as coagent monomer and 2,3,4,5,5,5-（2,4-ditrifluoromethyl） dodeca-fluoroamyl methacrylate （FA） was used as functional monomer. The infrared spectra and X-radial Photoelectron Spectroscopy （XPS） were used to testify the frame of low surface energy ABS resin.The influences of DCP concentration, monomer （FA） concentration and co-monomer（St） concentration were investigated in term of grafting reaction degree of FA,The water-resistance,surface tensile,glass transition temperature （Tg）, cross-section morp- hology and mechanical property of low surface energy ABS resin and low surface energy GFRABS composites were also investigated respectively by using Static Contact Angle Instrument, Differential Scanning Calorimetry （DSC）,Scanning Electron Microscope （SEM） and Electrical Tension Testing Machine.The main results were as follows:1. The FA monomer can been successfully grafted onto the macromolecure chain of ABS resin by simple reactive blending.2. The grafting reaction degree of FA on low surface energy ABS resin chain would increase with the concentration of DCP and FA increasingly, then to become smooth; The grafting reaction degree of FA on low surface energy ABS resin would obviously increase when St was added as coagent monomer. And the grafting reaction degree of FA was 13.5% when DCP was 0.6phr, St was 4phr , FA was 7phr.3. The Tg of low sueface energy ABS resin that reacted with FA was lower than pure ABS resin,but the Tg of low surface energy GFRABS composites was higher than low surface energy ABS resin.4. The photoes of SEM have showed that the section morphology of low surface energy ABS resin was similar to pure ABS resin. They type of rupture were toughness.5. The tensile strength and izod impact strength of low surface energy ABS resin were lower than pure ABS resin. The tensile strength and izod impact strength of low surface energy ABS resin was respectively 38.9 MPa and 8.5Mpa, when the grafting reaction degree of FA was 11.8%. The tensile strength and impact strength of low surface energy GFRABS composites were obviously higher than low surface energy ABS resin,the tensile strength of low surface energy GFRABS composite was 96.08 MPa and the impact strength was9.75 MPa,when GF concentration was 20 phr.6. The MFR of low surface energy ABS resin was obviously higher than pure ABS resin, and increased with DCP concentration augmenting.The MFR of ABS would become 4.5g/10min from 1.7g/10min,when DCP concentration was 0.8phr.7. As the same of pure ABS resin,low surface energy ABS resin was also a typical Non-Newtonian Fluid（n<1）,and the n Value would increase with temperature rising. The apparent viscosity would decrease with shear rate rising as exponential order at low shear rate, then become flat at high shear rate.The viscous flowing activation energy（Eη） of low surface energy ABS resin and ABS resin had little difference.8. It was found that low surface energy ABS resin and low surface energy GFRABS composites had outstandingly water-resistance,the wetting contact angle to water could reach 98°and 95.3°respectively. In addition,the surface tensile of low surface energy ABS resin and low surface energy GFRABS composites could reach 19.9×10^-3J/m² and 21.5×10^-3J/m² respectively.They were extremely low surface energy.But the water- resistance of low surface energy GFRABS composites would decrease,when GF concentration was excessive.