Study On Preparation And Properties Of Glass Fiber-reinforced PPS/PA66Alloy

As a kind of high performance special engineering plastics,Polyphenylene sulfide (PPS) exhibites excellent thermal stability, goodchemical resistance, flame retardance, electrical insulation and dimensionstability,etc. However, the extensive applications of PPS have beenlimited, owing to its poor toughness and lower impact strength. Blendingis a kind of very effective modification to improve impact resistance ofPPS.In this article, polyamide66(PA66) were used to blending modifyPPS and PPS/PA66system were studied.The result shows that PA66canimprove the mechanical properties of PPS and promote the crystallizationof PPS. While PA66can lower the thermal stability of PPS because theinitial decomposition temperature and heat deformation temperature ofPPS/PA66blends drop.In order to improve the compatibility between PPS with PA66, twodifferent compatibilizer ethylene-methylacrylate-glycidyl methacrylateterpolymer(E-MA-GMA) and Maleated Styrene-(Ethylene-co-Butene)-Styrene(SEBS-g-MAH) were used to prepare compatibilized PPS/PA66alloy through melting blending. The influence of the compatibilizer onmechanical properties,crystallization and melting behavior, thermalstability and theological properties of the PPS/PA66alloy wasinvestigated, and further the compatibilization mechanism wasdiscussesed. Mechanical property testing indicates that twocompatibilizer improved the mechanical properties of PPS/PA66alloy,the toughening effect is much more apparent with E-MA-GMA. Whenadding15phr E-MA-GMA, the impact strength of the alloy is14.1kJ/m2,which is4.2times that of pure PPS, elongation at break is17.93%, whichis2.1times that of pure PPS. DMA and SEM results indicated that thetwo compatibilizer have compatibilization effect on PPS/PA66alloy,furthermore, E-MA-GMA is much better than SEBS-g-MAH. DSCresults showed that E-MA-GMA and PPS have strong interactions.E-MA-GMA hindered crystallization of the PPS, and significantly reduced the crystallization temperature and crystallinity of the PPS. Onthe other hand, SEBS-g-MAH can promote the crystallization of thePPS. DTA demonstrated that E-MA-GMA can make the initialdecomposition temperature of PPS/PA66alloy higher,and enhanced itsthermal stability. SEBS-g-MAH lowers the thermal stability ofPPS/PA66alloy. Rheological properties testing showed that E-MA-GMAcan make the viscosity of the alloy melt increasing significantly, butwith the increase of SEBS-g-MAH content, melt viscosity first raiseand then decreases.Finally, glass fiber was select to reinforce PPS/PA66blends and theinfluence of E-MA-GMA and SEBS-g-MAH on glass fiber-reinforcePPS/PA66blends were studied. The results showed that: the PPS/PA66blends were prominently strengthened by glass fiber. However, addingwith E-MA-GMA can further enhance mechanical properties of the glassfiber-reinforce PPS/PA66blends, on the contrary, the mechanicalproperties of the composites deteriorated remarkably with SEBS-g-MAHfor the interface bonding were weakened between matrix resin and glassfiber.