纳米SiO2-NaOH-有机硅烷偶联剂表面改性对苎麻纤维/乙烯基酯树脂复合材料性能的影响  

Effects of nano SiO2-NaOH-silane coupling agent surface treatment on behavior of ramie fiber/vinyl ester resin composite

作　　者：倪爱清[1] 朱坤坤[2] 王继辉[2] NI Aiqing;ZHU Kunkun;WANG Jihui(State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China;School of Material Science and Engineering,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学材料复合新技术国家重点实验室,武汉430070 [2]武汉理工大学材料学院,武汉430070

出　　处：《复合材料学报》2019年第11期2579-2586,共8页Acta Materiae Compositae Sinica

摘　　要：为改善苎麻纤维/乙烯基酯树脂复合材料的力学性能和吸湿性能,采用纳米SiO2联合NaOH和有机硅烷偶联剂KH570对苎麻纤维进行改性,考察了该表面改性方法对苎麻纤维化学结构、表面形貌、结晶度及对苎麻纤维/乙烯基酯树脂复合材料的力学性能和吸水性的影响。结果表明,苎麻纤维表面的胶质被NaOH溶解,纤维吸水性变强,变得疏松,与树脂基体的黏结性增强,纤维结晶度随着碱浓度的增加先升高后降低;有机硅烷偶联剂KH570与苎麻纤维发生偶联作用,静态水接触角增大,疏水性增强,使苎麻纤维/乙烯基酯树脂复合材料界面性能提高;在有机硅烷偶联剂KH570作用下,SiO2以纳米级尺寸与苎麻纤维表面羟基产生共价键,从而提高了苎麻纤维/乙烯基酯树脂复合材料的力学强度;实验表明,该方法改性后的苎麻纤维/乙烯基酯树脂复合材料吸水率大大降低。In order to improve the mechanical performance and water resistance of ramie fiber/vinyl ester resin composite,ajoint surface treatment method of nano SiO2-NaOH-silane coupling agent KH570 was proposed,and the chemical structure,surface morphology,crystallinity of the ramie fiber after surface treatment and the mechanical properties and water absorption behavior of the surface treatmented ramie fiber/vinyl ester resin composite were investigated.The results show that the fibroglia on the ramie fiber surfaces is dissolved by alkali liquid which loosens the fibers and improves the fiber/resin interface binding.The crystalline order index of the ramie fiber increases first and then decreases as the alkali concentration increases.The reaction between ramie and silane coupling agent increases fiber water contact angle and hydrophobicity,and the interface binding is furtherly improved.With the combined treatment of nano SiO2-NaOH-silane coupling agent KH570,the crystalline order index of the ramie fiber decreases while the static water contact angle increases,resulting in enhancement of the mechanical properties of the ramie fiber/vinyl ester resin composite.The water absorption of the ramie fiber/vinyl ester resin composite also decreases with the incorporation of nano SiO2.

关 键 词：苎麻纤维 表面改性 复合材料 力学性能 吸水性 

分 类 号：TB332[一般工业技术—材料科学与工程] TB302.3