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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。
The self-made starch nanocrystals (SNC) were used to surface treat the glass fibers to increase their interfacial shear strength (IFSS) with the epoxy matrix. The effects of processing parameters, processing time, concentration of SNC ethanol dispersion and heat treatment temperature on the deposition of SNC on the surface of glass fiber and the influence of the modification on the interfacial properties of glass fiber and epoxy resin were studied. The glass fibers before and after treatment were characterized by scanning electron microscopy and single fiber strength tester, and the interfacial adhesion between glass fiber and epoxy resin was tested by micro-debonding method. The results showed that when the concentration of SNC ethanol dispersion was 1 g / 100 m L for 24 h, the SNC was uniformly deposited on the surface of glass fiber and the IFSS of glass fiber and epoxy resin could be significantly increased to 27.29 MPa , 29.3% more than untreated fiber. After heat treatment at 150 ℃ for 4 h, the X-ray photoelectron spectroscopy results showed that SNC and glass fiber formed chemical bonding, further increasing the interfacial bonding between fiber and epoxy resin, the IFSS value reached 32.30 MPa, increased 53% compared with untreated fiber Tensile strength of the fiber is better maintained.