迈科烯/乙烯-醋酸乙烯共聚物纳米复合材料的制备及性能

Preparation and Properties of MXene/Ethylene-Vinyl Acetate Copolymer Nanocomposite

迈科烯是兼具优异导电性与亲水性的新兴二维纳米材料,将其与加工性能好、柔韧性高的弹性体结合制备纳米复合材料是实现柔性功能材料的热门研究方向之一。首先采用氟化钠NaF/浓盐酸HCl水热法制备迈科烯Ti_(3)C_(2)T_(X),然后用溶液混合法制备了不同比例的Ti_(3)C_(2)T_(X)/EVA(乙烯-醋酸乙烯共聚物)纳米复合材料。采用差示扫描量热仪、维卡软化点测试仪和热重分析仪探究了Ti_(3)C_(2)T_(X)/EVA纳米复合材料的热学性能,数据表明随着Ti_(3)C_(2)T_(X)质量分数的增加,Ti_(3)C_(2)T_(X)/EVA纳米复合材料的熔融温度、结晶温度、维卡软化点温度、最大热失重温度都比纯乙烯-醋酸乙烯共聚物(EVA)高,说明了加入Ti_(3)C_(2)T_(X)提高了EVA的耐热性;使用万能拉力实验机研究了复合材料的力学性能,结果显示随着Ti_(3)C_(2)T_(X)含量的增加,复合材料的拉伸强度、断裂伸长率、弹性模量均呈现出先增大后减小的趋势,说明适量的Ti_(3)C_(2)T_(X)可以提高EVA的力学性能。

MXene is an emerging two-dimensional nanomaterial with excellent electrical conductivity and hydrophilicity.Combining it with elastomers with good processing properties and high flexibility to prepare nanocomposites is one of hot research directions for realizing flexible functional materials.In this paper,NaF/concentrated HCl hydrothermal method was used to prepare Ti_(3)C_(2)T(x)MXene,and then different ratios of Ti_(3)C_(2)T(x)/EVA nanocomposites were prepared by solution mixing method.Finally,differential scanning calorimeter(DSC),Vicat softening point tester and thermogravimetric analyzer(TG)were used to explore the thermal properties of the Ti_(3)C_(2)T(x)/EVA nanocomposite.The data show that with the addition of different mass fractions of Ti_(3)C_(2)T(x),the melted temperature,crystallization temperature,Vicat softening point temperature,and the maximum mass loss temperature of the EVA nanocomposites are all higher than those of pure EVA,indicating that the addition of Ti_(3)C_(2)T(x)improves the heat resistance of EVA;the mechanical properties of nanocomposite materials were studied by universal tensile testing machine,and the results show that with the Ti_(3)C_(2)T(x)content increasing,the tensile strength,elongation at break,and elastic modulus of the composite materials increase first and then decrease,indicating that an appropriate amount of Ti_(3)C_(2)T(x)can improve the mechanical properties of EVA.