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Multi-scale analysis of the interface structure and failure behaviors for n-SiO2@jute fiber/PP composites

2021; Elsevier BV; Volume: 267; Linguagem: Inglês

10.1016/j.compstruct.2021.113865

1879-1085

Xuan Liu, Yihua Cui,

Polymer Nanocomposites and Properties

To enhance the interface bonding performance between jute fibers (JFs) and polypropylene (PP), nano-SiO2 (n-SiO2) layers were coated on the carboxymethyl treated JFs (JFs-COOH). Molecular dynamics (MD) simulation, microscopic modelling and macroscopic tensile test were used to study the interface structure and failure behaviors of n-SiO2@JF/PP composites at multi-scale level. The results of MD simulation indicated that n-SiO2 layer including gel and array formed an interphase between JFs-COOH and PP, which was acted as a bridge to bond JFs-COOH and PP by the chemical bonding interaction and the mechanical interlocking of molecular chains. With n-SiO2 interphase, the interface binding energy of JF/PP composites was enhanced by 27.21%. n-SiO2 interphase served as a medium to transfer the tensile stress from PP to JFs-COOH, eliminating the tensile stress concentration at the interface defects. The tensile strength of n-SiO2@JF/PP composites was increased by 32.82% than that of JF/PP composites. Owing to the multi-layer and multi-phase structure of n-SiO2@JF/PP composites, the interface failure behaviors included n-SiO2@JFs breakage, n-SiO2@JFs internal debonding, n-SiO2 interphase interlaminar debonding, n-SiO2/PP interface debonding, PP cohesive failure. The strong interface may lead to PP cohesive failure or the internal debonding of n-SiO2@JFs.