Analysis of the properties of alkaline-treated rape straw and stalk polyvinyl chloride composites

Abstract

Wood-plastic composites are being widely used more and more, and the bonding strength between fillers and matrix is an important factor affecting the properties of wood-plastic composites. In this study, rapeseed straw and rapeseed stalk were pretreated with sodium hydroxide and then filled with polyvinyl chloride matrix to prepare composites. The chemical composition, thermal stability, microstructure, physical properties, mechanical properties, and abrasive wear resistance of the composites were characterized, and the effects of different concentrations of alkaline treatment on rapeseed straw composite and rapeseed stalk composite were revealed. The results show that alkaline treatment has no significant effect on the chemical composition of the composites but has an obvious effect on other properties. Among them, after 1% alkaline treatment, rapeseed straw composite has the highest hardness, thermal stability, and impact strength, rapeseed stalk composite has the highest impact strength and bending strength. After 3% alkaline treatment, rapeseed straw composite has more wear resistance, rapeseed stalk composite has the highest density, the highest tensile strength, and more wear resistance. The rapeseed straw composite with 5% alkaline treatment has the highest density, and the rapeseed stalk composite with 7% alkaline treatment has the highest thermal stability. The hardness of rapeseed stalk composite and the tensile strength and bending strength of rapeseed straw composite decreased with the increase of alkaline treatment concentration.

Preparation and properties of PVC composites filled with walnut shell powder hybrid attapulgite

“…As a result, the composites cannot meet the requirements of applications because of their poor mechanical and physical properties. 9 In order to solve the problems of incompatibility and easy agglomeration between biological fillers and plastic matrix, acid, 10,11 alkali, 12,13 or coupling agent 14,15 are generally used to modify the fillers. Alkali treatment is one of the more mature treatment methods, which has been proved to be feasible in many studies.…”

Effect of Agricultural Biomass Residues on the Properties of Recycled Polypropylene/Polyethylene Composites

“…They also compared the influence of healthy rapeseed fibers and those infested with the S. sclerotiorum fungus on a polypropylene matrix’s mechanical properties [ 8 ]. Bichi A.H. et al [ 9 ] studied the influence of treated and untreated fibers on the structural, thermal and mechanical properties of polyvinyl chloride matrix composites. Furthermore, rapeseed fibers were also assessed as a replacement for wood particles in particleboard production [ 10 , 11 ].…”