表面改性对纳米蒙脱土/聚酰胺6-66复合材料性能的影响  

Effects of surface modification on properties of nano montmorillonite/polyamide 6-66composites

作　　者：易著武 刘跃军[1,2] 刘小超[1] 杨坚 毛龙[2] 崔玲娜 YI Zhuwu;LIU Yuejun;LIU Xiaochao;YANG Jian;MAO Long;CUI Lingna(Key Laboratory of Advanced Packaging Materials and Technology of Hunan Province,Hunan University of Technology,Zhuzhou 412007,China;Key Laboratory of Polymer Processing Principle and Applications of Xiamen City,Xiamen University of Technology,Xiamen 361024,China)

机构地区：[1]湖南工业大学先进包装材料与技术湖南省重点实验室,株洲412007 [2]厦门理工学院聚合物加工原理与应用厦门市重点实验室,厦门361024

出　　处：《复合材料学报》2020年第1期57-66,共10页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(11872179);湖南省自然科学基金(2018JJ4072);福建省科技计划项目(2018H6024)。

摘　　要：选取三种不同的纳米蒙脱土(nMMT)(分别为钠基蒙脱土(Na-MMT)、氨基酸改性nMMT(OMMT-A)和CH3(CH2)17N(CH3)[(CH2CH2OH)2]+改性nMMT(OMMT-B)),通过熔融共混法制备了不同改性的纳米蒙脱土/聚酰胺6-66(nMMT/PA6-66)复合材料,研究了不同表面改性对nMMT/PA6-66复合材料的结晶、流变和力学等性能的影响。结果表明,nMMT的加入促进了nMMT/PA6-66复合材料中γ晶的形成,提高了复合材料的结晶温度,但加入OMMT-B后OMMT-B/PA6-66复合材料的异相成核作用效率有一定程度减弱;同时,OMMTB能更好地改善PA6-66的储能模量,提高PA6-66的流动性。力学性能测试表明,nMMT提高了nMMT/PA6-66复合材料的强度,降低了复合材料的韧性,但效果不同。其中,加入OMMT-B后OMMT-B/PA6-66复合材料的韧性几乎保持不变,拉伸强度和弯曲强度相对于纯PA6-66分别提高了26%和28%,表现出最佳的综合力学性能。综合研究结果表明,不同表面改性nMMT对PA6-66性能的影响主要取决于改性剂和PA6-66分子链之间相互作用的强弱。The three different kinds of nano montmorillonites(nMMT)(Na-montmorillonite(Na-MMT),nMMT modified by amino acid(OMMT-A),and nMMT modified by CH3(CH2)17 N(CH3)[(CH2 CH2 OH)2]+(OMMTB))were added into the polyamide 6-66(PA6-66)matrix through melt blending to prepare different nano montmorillonite/polyamide 6-66(nMMT/PA6-66)composites.The effects of different surface modified nMMTs on crystallization behaviors,rheology properties and mechanical properties of PA6-66 were investigated.It is observed that nMMTs can promote the formation ofγ-crystal and increase the crystallization temperature of nMMT/PA6-66 composites,but the efficiency of heterogeneous nucleation of OMMT-B decreases to a certain extent.Simultaneously,OMMT-B has better ability to improve the storage modulus and flow ability of PA6-66 compared with other two nMMTs.The mechanical properties results show that nMMTs can increase the strength and decrease the toughness of PA6-66,but the effects are different.Among these composites,the nMMT/PA6-66 composite incorporated with OMMT-B has the best mechanical performance,not only the tensile strength and the flexural strength are raise 26%and 28%compare with the pure PA6-66,respectively;but also the toughness is close to unchanged.Based on the comprehensive results,the effects of different surface modified nMMTs on the properties of PA6-66 have been studied systemic,which is mainly depends on the interaction between the organic modifier of nMMT and PA6-66 molecular chains.

关 键 词：表面改性 聚酰胺 蒙脱土 复合材料 熔融共混 力学性能 

分 类 号：TB324[一般工业技术—材料科学与工程]