Humidity Diffusion on Jute/Polyester Laminated Composites and Its Effects on Mechanical Properties  

作　　者：Rafael Pacheco Evangelista Victor Antunes Silva Barbosa Larissa Rocha Reis Peter Menezes dos Reis Jr. Carlos Alberto França Jr. Mirtânia Antunes Leão Sandro Fábio César 

机构地区：[1]Academic Department of Mechanical Technology,Federal Institute of Education,Science and Technology of Bahia,Salvador 40301-015,Brazil [2]Polytechnic School,Federal University of Bahia,Salvador 40210-630,Brazil

出　　处：《材料科学与工程（中英文B版）》2021年第4期138-143,共6页Journal of Materials Science and Engineering B

基　　金：the Federal Institute of Education,Science and Technology of Bahia(IFBA)and its Office of Research,Graduation Studies and Innovation(PRPGI)for the financial support.

摘　　要：Jute is a natural fiber widely used as reinforcement in composites due to its high tensile strength and stiffness,but they can easily absorb water and have their physical properties compromised.The water absorption properties of jute/polyester composites are evaluated according to ASTM D 570 and the effect of humidity in the composite mechanical behavior is also analyzed.The composite showed a pseudo-Fickian behavior and gained 13.37%in weight after the test.It also lost tensile strength and elasticity modulus,and increased its specific deformation.Scanning electron microscope images showed that wet specimens were more subject to cracks,voids and fiber pullout than dry specimens.Failures produced by water diffusion in composite and polymer plasticization,added to breakdown in the fibers’cellulosic structures,justify the change in mechanical properties due to water absorption.

关 键 词：Natural fiber reinforced composites(NFRCs) jute fiber water absorption polyester composites diffusion in composites. 

分 类 号：TB3[一般工业技术—材料科学与工程]