ABS的MAH/St多单体熔融接枝及其对PA6/ABS共混体系相形态和力学性能的影响

通过多单体熔融接枝的方法制备出了具有较高接枝率的ABS接枝物 (ABS g (MAH co St) ) ,并对其接枝机理进行了初步探讨 .研究表明 ,MAH、St接枝ABS时 ,反应主要发生在ABS中聚丁二烯的双键部位 .同时 ,当MAH与St的用量比约为 1:1时接枝率达到最高 .ABS g (MAH co St)作为尼龙 6 (PA6 ) ABS共混体系相容剂起到了良好的增容效果 .实验证明 ,相容剂使用前后 ,共混物的相区尺寸由几十 μm减小到 1μm以下 ,且分布更加均匀 ;共混物的拉伸强度和冲击强度等力学性能也同时得到均衡改善 .

THE PREPARATION OF MAH/St MULTI-MONOMER MELT GRAFTING ON ABS AND ITS COMPATIBILIZER EFFECT ON PA6/ABS BLENDS

Free\|radical melt grafting of the multi\|monomre system of maleic anhydride(MAH)/styrene(St) onto ABS resin was studied using a Hakke rheometer.The maximum MAH graft degree was obtained when the molar ratio of MAH to St was approximately 1∶1.The addition of St,an assisting monomer,improved the grafting reactivity of MAH,and St also reacted with MAH to form the St\|MAH copolymer(SMA) before the two monomers grafted onto BAS.The site of grafting is mainly at the double bonds of ABS.ABS g (MAH co St) was used as a precursor on in\|situ compatibilizer for incompatible blend of PA6 and ABS.The changes in morphologies of PA6/ABS/ABS g (MAH co St) blends with different contents of ABS g (MAH co St) were investigated using SEM.The addition of ABS g (MAH co St) markedly improved the morphologies of the blends,and an uniform and fine dispersed phase was obseved with size being about 0 1?μm for a PA6/ABS g (MAH co St)(70/30) blend.The addition of ABS g (MAH co St) also greatly improved the mechanical properties of PA6/ABS blends.The Izod impact strength of the blends greatly increased with increasing the content of ABS g (MAH co St) in the blends,and the tensile strength of the blends also incresed.The PA6/ABS blends with balanced mechanical properties could be obtained by addition of ABS g (MAH co St).