Vitiello Libera, Russo Pietro, Papa Ilaria, Lopresto Valentina, Mocerino Davide, Filippone Giovanni
Department of Chemical, Materials and Production Engineering, University of Naples Federico II, Piazzale Tecchio 80, 80125 Naples, Italy.
Institute for Polymers, Composites and Biomaterials-National Council of Research, 80078 Pozzuoli (Naples), Italy.
Polymers (Basel). 2021 Mar 27;13(7):1055. doi: 10.3390/polym13071055.
Environmentally friendly composite plates intended for load-bearing applications were prepared and systematically characterized in terms of mechanical performances and morphological features. Sample plates combining two extrusion grades of bio-polyamide 11, one of which is plasticized, and two basalt fiber fabrics (plain weave and twill architectures) were obtained by film stacking and hot pressing, and their mechanical properties were investigated by quasi-static flexural and low-velocity impact tests. The comparative analysis of the results, also interpreted by the bending damage analysis, through optical microscope observations, and impact damage analysis through visual inspection and indentation measurements demonstrate that, besides interfacial adhesion issues, the mechanical performance of the laminates need to be optimized through a careful selection of the constituents in the light of the final application. In particular, if the goal is a gain in impact strength, the use of the plasticized matrix is beneficial, but it brings about a loss in stiffness and strength that can be partially compensated by properly selecting a more performing fiber fabric architecture. The latter must also be easily permeated by the matrix to enhance the efficiency of stress transfer from the matrix. Overall, our results can be exploited for the development of bio-composites for particularly demanding applications.
制备了用于承重应用的环保复合板，并对其力学性能和形态特征进行了系统表征。通过薄膜堆叠和热压获得了结合两种挤出级别的生物聚酰胺11（其中一种是增塑的）以及两种玄武岩纤维织物（平纹和斜纹结构）的样板，通过准静态弯曲和低速冲击试验研究了它们的力学性能。通过光学显微镜观察对弯曲损伤分析以及通过目视检查和压痕测量对冲击损伤分析得到的结果进行比较分析表明，除了界面粘合问题外，还需要根据最终应用仔细选择成分来优化层压板的力学性能。特别是，如果目标是提高冲击强度，使用增塑基体是有益的，但会导致刚度和强度损失，通过适当选择性能更优的纤维织物结构可以部分弥补这种损失。后者还必须易于被基体渗透，以提高应力从基体传递的效率。总体而言，我们的结果可用于开发适用于特别苛刻应用的生物复合材料。
