Studying On Manufacture And Properties Of PPS/PA46Alloy

Poly(phenylene sulfide)(PPS) is one of engineering plastics with excellent combinationproperties, but it has low impact properties, which limit its application range. Therefore,many works are concerned on the area of PPS modification, especially its tougheningmodification. In this paper, a series of PPS/PA46alloy with high toughness andthermostability were made by twin-screw extruding blending and their comprehensivecharacterization were also studied. The main conclusions are as follows:1. There was no increase of impact strength of the PPS/PA46alloy by melt blendingdirectly. A series of PPS/PA46/POE-g-MAH and PPS/PA46/PP-g-(GMA-co-St) alloy weremade and the compatibilizer was POE-g-MAH and PP-g-(GMA-co-St), respectively. It wasfound that with the increasing of PA46and compatibilizer content the impact strength ofPPS/PA46/POE-g-MAH alloy enhanced, meanwhile, its tensile strength and HDTunderwent certain enhancement. MPPS/PA46alloy was also prepared, its process was: PPSresin was first chemical treated by MDI and then blend with PA46and SEBS-g-MAH, theresults showed that: the alloy possessed the best comprehensive mechanical propertieswhen PPS/MDI was100/2, this alloy may undergo brittle ductile transition gradually andits izod impact strength, tensile strength and HDT increased with the increasingcompatibilizer content.2. The melting and crystallization behavior of PPS/PA46/POE-g-MAH alloy were thenstudied. The results showed that the crystallization rate and the Tcof PPS increased, and itscrystallization temperature enhanced gradually with the increasing PA46. But there was nosignificant change about their melting temperature. The result of TG test showed that thethermal degradation process of this alloy followed two-step degradation, the degradation ofPA46was the first step and the second step was the degradation of PPS. Then thecrystallization and melting behavior of MPPS/PA46/SEBS-g-MAH alloy were investigated.It was found that the Tcof pure PPS and pure PA46were both lower than that of PA46andPPS in alloy, the Tmof each portion decreased slightly with the increasing compatibilizercontent.3. The dynamic mechanical behavior of PPS, PA46and their alloy was also investigated.The result indicated that its dynamic mechanical behavior became complex with theincreasing SEBS-g-MAH, the toughness of this alloy increased for the lower αtransitionof the alloy. The change of αtransition peak was not abvious when compatibilizer content was below9phr, which indicated that this alloy has good compatibility. But the transitiontemperature underwent a significant decrease when the compatibilizer content reached9phr.4. The morphology of MPPS/PA46/SEBS-g-MAH alloy was lastly investigated usingscanning electronic microscope(SEM) technique. It was found that PPS underwent brittlerupture, and so was the fracture surface of alloy R0. The interface of dispersed phase andPPS became obscuring with the increaseing compatibilizer content, which illustrated thatthe obvious compatibility improvement. And the impulse strength increased for the externalforce was better transfer, and energy was absorbed.