Abstract

The low deflection at break of unsaturated polyester resin-based composites is a problem in many industrial applications. In this work an attempt was made to optimize the bulk molding compound formulation with respect to styrene–butadiene rubber (SBR) and fumed silica (FS) components to obtain optimum mechanical properties (flexural strength and deflection at break) and density. To this end an experimental design was used to study the influence of each parameter and its interaction with the responses (density, flexural strength, and deflection at break). Accordingly, four levels of SBR (0, 10, 20, and 30 wt%) and three levels of FS (0, 1, and 3 phr) were used. The addition of FS increased the flexural strength and density of the composites, but lowered their deflection at break, while the effect of SBR was almost vice versa. Based on the desirability function, the 10 wt% SBR without FS was suggested to be the optimum composition providing the best density, strength, and deformability. It was also seen that adding 3 phr FS increased the flexural strength, but without the desired density and deflection at break. Moreover, the R² obtained from the ANOVA and plots of normal probability showed good compliance between the experimental results and those predicted using a full factorial model.

抽象的

在许多工业应用中，不饱和聚酯树脂基复合材料的低断裂挠度是一个问题。在这项工作中，尝试针对苯乙烯-丁二烯橡胶（SBR）和气相二氧化硅（FS）组分优化了散装模塑料的配方，以获得最佳的机械性能（弯曲强度和断裂挠度）和密度。为此，使用实验设计来研究每个参数的影响及其与响应（密度，抗弯强度和断裂挠度）的相互作用。因此，使用了四个水平的SBR（0、10、20和30 wt％）和三个水平的FS（0、1、3 phr）。FS的添加增加了复合材料的弯曲强度和密度，但降低了其断裂挠度，而SBR的效果几乎相反。基于合意性函数，不含FS的10wt％SBR被认为是提供最佳密度，强度和可变形性的最佳组合物。还可以看出，添加3 phr FS可以提高抗弯强度，但没有所需的密度和断裂挠度。而且，从方差分析和正态概率图获得的R ²在实验结果和使用完整阶乘模型预测的结果之间显示出良好的一致性。