Aranha Rudá, Filho Mario A Albuquerque, de Lima Santos Cícero, Fonseca Viviane M, Rivera José L V, de Lima Antonio G B, de Amorim Wanderley F, Carvalho Laura H
Escuela de Ingeniería Mecánica, Pontifícia Universidad Católica de Valparaíso 1, Valparaíso 2340025, Chile.
Post-Graduate Program in Materials Science and Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Brazil.
Polymers (Basel). 2023 Nov 16;15(22):4438. doi: 10.3390/polym15224438.
The aim of this work is to analyze water sorption in hybrid polyester/glass fabric/jute fabric composites molded via compression and VARTM (Vacuum-Assisted Resin Transfer Molding). The laminates were produced with five different stacking sequences and subjected to water sorption testing at room temperature, 50 °C and 70 °C. This study consisted of two stages: experimental and theoretical stages. The composites had a fiber volume content ranging from 30% to 40%. Water absorption and diffusion coefficient in the hybrid composites were intermediate to those reinforced with a single type of fiber. There were no significant differences in these properties based on fiber arrangement once the composites reached saturation. Diffusion coefficient values were higher for specimens with jute fiber on at least one of the outer surfaces. Water sorption rates increased with higher immersion temperatures. The water sorption at saturation point was not affected by the manufacturing process. Among the hybrid composites, those with jute on the surfaces showed the highest diffusion coefficient, while those with glass on the surface had the lowest values. Higher diffusion coefficient values were observed at temperatures of 50 °C and 70 °C. The main influencing factors on the absorbed moisture content for composites are the presence and content of jute fibers in the system and the immersion temperature. The manufacturing process does not affect the water sorption at saturation point.
这项工作的目的是分析通过压缩成型和真空辅助树脂传递模塑（VARTM）工艺制备的聚酯/玻璃纤维织物/黄麻纤维织物混杂复合材料的吸水性能。层压板采用五种不同的铺层顺序制作，并在室温、50°C和70°C下进行吸水测试。本研究包括两个阶段：实验阶段和理论阶段。复合材料的纤维体积含量在30%至40%之间。混杂复合材料的吸水率和扩散系数介于单一纤维增强复合材料之间。一旦复合材料达到饱和状态，基于纤维排列的这些性能没有显著差异。对于至少一个外表面有黄麻纤维的试样，扩散系数值更高。吸水速率随浸泡温度的升高而增加。饱和点的吸水量不受制造工艺的影响。在混杂复合材料中，表面有黄麻纤维的复合材料扩散系数最高，而表面有玻璃纤维的复合材料扩散系数最低。在50°C和70°C的温度下观察到较高的扩散系数值。影响复合材料吸湿量的主要因素是体系中黄麻纤维的存在和含量以及浸泡温度。制造工艺不影响饱和点的吸水量。
