EVA-g-MAH对CaSO_4晶须/尼龙6复合材料性能的影响  

Effects of EVA-g-MAH on the properties of CaSO_4 whiskers/nylon 6 composites

作　　者：孙文奎[1] 周松[1] 马俊辉 罗玉梅[1] 闫珂华 张宇[1] 

机构地区：[1]西南石油大学材料科学与工程学院,成都610500 [2]成都产品质量检验研究院有限责任公司,成都610015

出　　处：《复合材料学报》2017年第8期1645-1652,共8页Acta Materiae Compositae Sinica

摘　　要：采用马来酸酐接枝乙烯-醋酸乙烯酯共聚物(EVA-g-MAH)对CaSO_4晶须/尼龙6(CaSO_(4W)/PA6)增韧改性。通过双螺杆挤出机制备了CaSO_(4W)/PA6二元、CaSO_(4W)-(EVA-g-MAH)/PA6三元复合材料,用SEM、DSC、XRD等观察和表征了形貌、结构和结晶参数,并测试了力学性能。研究表明:添加少量CaSO_(4W)可提高PA6的结晶速率,而高含量CaSO_(4W)导致PA6结晶速率降低,促进γ晶型形成。添加10%(质量分数)CaSO_(4W)可同时提高PA6的刚性和韧性;添加30%CaSO_(4W)可进一步提高PA6的刚性,但PA6的韧性明显降低。添加2.5%和5%(质量分数)EVA-g-MAH,能使30%CaSO_(4W)-(EVA-g-MAH)/PA6的抗冲击强度分别提高25.0%和76.7%,并使其具有较高韧性。冲击强度的提高主要源于EVA-g-MAH所产生的能量耗散、改善应力的有效传递、增强CaSO_(4W)与PA6的界面以及EVA-g-MAH/PA6共混体系较好的相容性。Maleic anhydride grafted ethylene-vinyl acetate copolymer（EVA-g-MAH）was used to toughen the calcium sulfate whiskers（CaSO_（4W））/nylon6（PA6）composites.The CaSO_（4W）/PA6 and CaSO_（4W）-（EVA-g-MAH）/PA6 composites were prepared using by a twin screw extruder,and analyzed by means of SEM,DSC,XRD and mechanical testing.The results indicate that addition of small amounts of CaSO_（4W） can increase the rate of crystallization,however,higher CaSO_（4W） contents lead to a decreased rate of crystalization and promotion of formingγ-crystals of PA6.Adding 10%（mass fraction）CaSO_（4W） increases both the stiffness and toughness of PA6.Adding 30% CaSO_（4W） can further improve the stiffness but significantly decreases the fracture toughness of PA6.With 2.5% and 5%mass fraction of EVA-g-MAH,the impact strength of 30%CaSO_（4W）-（EVA-g-MAH）/PA6 increases by 25.0% and76.7%,respectively,thus imparting the higher toughness to the 30%CaSO_（4W）/PA6.The improvement of impact strength of the composites mainly results from energy-absorption process,effective stress transfering,the increasing in interfacial adhesion between CaSO_（4W） and PA6 in the presence of EVA-g-MAH as well as good miscibility of EVAg-MAH/PA6 blend system.

关 键 词：接枝共聚物 CASO4晶须 尼龙6 复合材料 力学性能 

分 类 号：TQ342.11[化学工程—化纤工业]