淀粉纳米晶对玻璃纤维的表面改性研究

采用自制的淀粉纳米晶(SNC)对玻璃纤维进行表面处理,增加其与环氧树脂基体的界面剪切强度(IFSS)。研究了处理方式、处理时间、SNC乙醇分散液浓度、热处理温度等工艺参数对SNC在玻璃纤维表面沉积情况的影响,以及对改性玻璃纤维与环氧树脂的界面性能的影响规律。采用扫描电子显微镜、单纤维强力仪对处理前后玻璃纤维进行表征,并采用微脱粘法测试玻璃纤维与环氧树脂的界面粘结情况。结果表明,当重力静置处理时间24 h,SNC乙醇分散液浓度为1 g/100 m L时,SNC在玻璃纤维表面均匀沉积,且能显著提高玻璃纤维与环氧树脂的IFSS,为27.29 MPa,较未处理的纤维增加29.3%。150℃热处理4 h后,X射线光电子能谱结果显示SNC与玻璃纤维形成化学键合,进一步增加纤维与环氧树脂的界面粘结,IFSS值达到32.30 MPa,较未处理的纤维增加53%,且纤维的拉伸强度得到较好的维持。

Study on Surface Modification of Glass Fiber by Starch Nanocrystals

The glass fiber was treated with starch nanocrystals (SNC) prepared by self to increase the interface shear strength (IFSS) with epoxy resin matrix. The influences of treatment methods,treatment time,concentration of SNC ethanol dispersion solu-tion and heat treatment temperature on the surface deposition of SNC and the interfacial properties of the modified glass fiber and epoxy resin were studied. The fibers before and after treatment were characterized by scanning electron microscopy and single fiber strength tester,and the interface bonding of the fiber and epoxy resin was analyzed by using microdebonding method. The results show that SNC can be deposited on the surface of glass fiber uniformly,when the fiber is deposited by gravity standing for 24 h and the concentration of SNC ethanol dispersion solution is 1 g/100 mL,the IFSS is increased obviously,to 27.29 MPa,improved by 29.3% compared with the untreated fiber. After heat treatment at 150℃ for 4 h,X-ray photoelectron spectroscopy shows there ex-ists chemical bonds between glass fiber and SNC and improves the interface bonding of the fiber and epoxy resin further,the IFSS reaches 32.30 MPa,is improved by 53% compared with the untreated fiber,and the tensile strength of the fiber can be well kept.