EVA-g-MAH对导电炭黑/PA66复合材料性能和形貌的影响  

Effect of EVA-g-MAH on the Properties and Morphologies of Conductive Carbon Black/PA66 Composites

作　　者：魏菊[1] 马正禄 黄坤 甘巧 WEI Ju;MA Zheng-lu;HUANG Kun;GAN Qiao(Sichuan Vocational College of Chemical Technology,Luzhou 646300,China)

机构地区：[1]四川化工职业技术学院,四川泸州646300

出　　处：《塑料科技》2024年第7期38-42,共5页Plastics Science and Technology

基　　金：精细化工应用技术泸州市重点实验室项目(HYJH-2308-B)。

摘　　要：采用马来酸酐接枝乙烯-醋酸乙烯酯共聚物(EVA-g-MAH)改性,用双螺杆挤出和注塑成型制备增韧的导电炭黑/尼龙66(CCB/PA66)抗静电复合材料,测试材料力学、熔体流动和抗静电性能,使用扫描电子显微镜(SEM)观察断面相貌,采用差示扫描量热法(DSC)研究结晶行为。结果表明:EVA-g-MAH和PA66相容性良好。CCB能够提高PA66的抗静电性能,但使韧性和熔体流动性能降低。EVA-g-MAH可改善8%CCB/PA66的韧性和熔体加工性能。在8%CCB/PA66共混物中添加10%EVA-g-MAH,使冲击强度和断裂伸长率分别提高75.4%和45.1%,同时8%CCB/EVA-g-MAH/PA66保持较高的拉伸强度(50.5 MPa)。EVA-g-MAH质量分数为20%时,CCB选择性分布使8%CCB/PA66的体积电阻率和表面电阻降低2~3个数量级,分别达到4.3×10^(7)Ω·cm和6.5×10^(6)Ω。EVA-g-MAH质量分数为10%时,能够促进8%CCB/EVA-g-MAH/PA66中PA66的结晶;EVA-gMAH质量分数为20%时,会抑制8%CCB/EVA-g-MAH/PA6中PA66的结晶。Tough conductive carbon black/nylon66(CCB/PA66)antistatic composites modified by maleic anhydridegrafted ethylene-vinyl acetate copolymer(EVA-g-MAH)were prepared by twin-screw extrusion and injection molding.The mechanical,melt flow,and antistatic properties of the composites were tested,and the fracture surface morphologies and crystallization behavior of the composites were observed and studied by scanning electron microscopy(SEM)and differential scanning calorimetry(DSC),respectively.The results showed that EVA-g-MAH has good compatibility with PA66.The antistatic properties of PA66 increased with the addition of CCB,however the toughness and processing ability of the composites decreased significantly.The addition of 10%EVA-g-MAH in the 8%CCB/PA66 blend resulted in a 75.4%and 45.1%increase in impact strength and elongation at break,respectively,while maintaining relatively higher tensile strength(50.5 MPa).When the mass fraction of EVA-g-MAH was 20%,the volume resistivity and surface resistance and of 8%CCB/PA66 decreased by 2 to 3 orders of magnitude to 4.3×10^(7)Ω·cm and 6.5×10^(6)Ω,respectively,due to the selective location of CCB particles in 8%CCB/EVA-g-MAH/PA66.10%EVA-g-MAH enhanced the crystal formation of PA66 in the 8%CCB/EVA-g-MAH/PA6 composites,however 20%EVA-g-MAH inhibited the crystal formation of PA66.

关 键 词：尼龙66 导电炭黑 马来酸酐接枝乙烯-醋酸乙烯酯共聚物 力学性能 抗静电性能 

分 类 号：TQ323.6[化学工程—合成树脂塑料工业] TB332[一般工业技术—材料科学与工程]