Fernández Meylí Valin, González María José Ahumada, Oyanadel Rolando Briones, Rivera José Luis Valin, Soto Angel Rodríguez, Ortega Alvaro González, Ketterer Cristobal Galleguillos, Alvarez Alexander Alfonso, Diaz Francisco Rolando Valenzuela, García Del Pino Gilberto
Department of Mechanical Engineering (DIM), Faculty of Engineering (FI), University of Concepción, Concepción 4030000, Chile.
Escuela de Ingeniería Mecánica, Pontificia Universidad Católica de Valparaíso, Valparaíso 2340025, Chile.
Polymers (Basel). 2023 Mar 22;15(6):1571. doi: 10.3390/polym15061571.
The influence of the addition of bentonite nanoparticles on the tensile and flexural strength of a thermosetting polymer matrix composite material reinforced with hemp fibers was de-terminated. All composites were manufactured with 5% of bentonite in the polymer mass-weight ratios and 10 to 45 wt% of fibers with a step of 5%. For mechanical characterization, tensile and flexural tests were performed: scanning electron microscopy and energy-dispersive X-ray spectroscopy analyses were carried out. The tensile strength of the samples containing bentonite compared to the polymer samples with the fiber addition was affected for all fiber addition percentages, except for 35% while the flexural resistance improved with the addition of bentonite in the percentages of 20, 30, 35, and 45% of fiber addition. With the addition of bentonite, the maximum values of tensile and flexural strength were both obtained for the 35% addition of fibers, with values of 34.28 MPa and 98.04 MPa, respectively. The presence of bentonite favored the rigidity of the material to traction and bending, which was reflected through an increase in the elastic modulus compared to the composite that only had fiber. The maximum values obtained were 9065 MPa in tension and 8453 MPa in flexion for the 40% and 35% of addition of fiber, respectively. Microscopy showed a good distribution of fibers in the matrix, the absence of internal porosities, and a good interaction between matrix and reinforcement.
测定了添加膨润土纳米颗粒对麻纤维增强热固性聚合物基复合材料拉伸强度和弯曲强度的影响。所有复合材料均以聚合物质量比中5%的膨润土和10%至45%（步长为5%）的纤维制成。为进行力学表征，开展了拉伸和弯曲试验，并进行了扫描电子显微镜和能量色散X射线光谱分析。与添加纤维的聚合物样品相比，含膨润土样品的拉伸强度在所有纤维添加百分比下均受到影响，但35%的情况除外，而在纤维添加量为20%、30%、35%和45%时，添加膨润土可提高弯曲强度。添加膨润土后，纤维添加量为35%时获得了拉伸强度和弯曲强度的最大值，分别为34.28MPa和98.04MPa。膨润土的存在有利于材料在拉伸和弯曲时的刚性，这通过与仅含纤维的复合材料相比弹性模量的增加得以体现。纤维添加量为40%和35%时，拉伸和弯曲时获得的最大值分别为9065MPa和8453MPa。显微镜观察显示纤维在基体中分布良好，无内部孔隙，且基体与增强材料之间相互作用良好。
