油酸表面修饰对竹粉/聚己内酯复合材料力学性能的影响

Effect of Oleic Acid Surface Modification on the Mechanical Properties of OA-BF/PCL Composites

以油酸(OA)作为表面活性剂,包覆在碱处理过的竹粉(BF)表面。再将聚己内酯(PCL)与油酸包覆的竹粉(OA-BF)熔融共混,通过热压成型制得了竹粉填充聚己内酯复合材料(OA-BF/PCL)。使用傅里叶红外光谱(FTIR)、热失重分析仪(TG)、扫描电子显微镜(SEM)、万能力学试验机、示差扫描量热仪(DSC)等分析仪器对OA-BF/PCL复合材料进行表征,研究OA-BF/PCL复合材料的微观结构、力学性能和非等温结晶行为。结果表明,OA的修饰提高了BF的热稳定性;OA-BF与PCL基体之间相容性好,界面结合紧密;OA-BF/PCL复合材料的拉伸强度和冲击强度在OA-BF质量分数为5%时分别提升了15%、16%,而拉伸模量与填充量成正比,提升了58%。且适量的OA-BF能够促进PCL结晶,相比纯PCL的结晶度提升了1.3倍。

Oleic acid(OA)was used as a surfactant to coat the surface of alkali-treated bamboo fiber(BF).The BF filled polycaprolactone composite(OA-BF/PCL)was produced by melt-blending polycaprolactone(PCL)with the oleic acid-coated bamboo fiber(OA-BF)by hot pressing and molding.The OA-BF/PCL composites were characterized using analytical instruments, such as, Fourier infrared spectroscopy(FTIR),thermal weight loss analyzer(TG),scanning electron microscope(SEM),universal mechanical testing machine, and differential scanning calorimeter(DSC)to study the microstructure, mechanical properties and non-isothermal crystallization behavior of the OA-BF/PCL composites.The results show that the modification of OA improves the thermal stability of BF.The compatibility between OA-BF and PCL matrix is good and the interface is tightly bonded.The tensile strength and impact strength of OA-BF/PCL composites are improved by 15%,16%,respectively, at 5%of OA-BF filling, while the tensile modulus is increased by 58%proportional to the filling amount.And the appropriate amount of OA-BF can promote the crystallization of PCL,which is 1.3 times higher than that of pure PCL.