The Influence of Nano-CaCO3 on the Mechanical and Dynamic Thermo-Mechanical Properties of Core–Shell Structured Wood Plastic Composites

Abstract

Using bamboo residue and high-density polyethylene (HDPE) as the main raw materials, core–shell structured wood plastic composites (WPCs) with nano-CaCO3 filling shell were prepared by coextruded technology. The effect of nano-CaCO3 contents on the flexural properties, impact strength and dynamic thermo-mechanical properties of the core–shell structured WPCs were investigated. And the value of core–shell interface interaction parameter was calculated by dynamic thermodynamic parameters. The results showed that the flexural strength increased by 48.1% and 40.3% when it was loaded with 10%–15% nano-CaCO3, compared to the HDPE shell composites, respectively. While nano-CaCO3-filled HDPE shell had lower impact strength in comparison with HDPE shell, the field emission scanning electron microscope revealed proper interfacial adhesion between the core and shell layers. The storage modulus of core–shell structured WPCs increased as nano-CaCO3 contents increased, but the values were lower than that of the HDPE shell. Addition of nano-CaCO3 caused an increase in the glass transition temperature (Tg) of the core–shell structured WPCs, loss factor (tanδ) of the core–shell structured WPCs decreased. The value of the core–shell interface interaction parameter of the core–shell structured WPCs increased significantly after the nano-CaCO3 loading reached 15%, which was consistent with the bending test results. These findings demonstrate that the core–shell structured WPCs have excellent properties filling with nano-CaCO3 in the shell layer, and bamboo residue is added to the core layer.

Co-Extruded Wood-Plastic Composites: Their Structure, Properties, and Applications

“…The constituents of the shell layer are crucial in determining the collective mechanical performance of Co-WPCs, with the ability to attain desirable mechanical properties through adjustments in the shell layer quality [14]. Variations in the shell layer quality were achieved by altering wood flour content [11,12,21], incorporating reinforced fibers [22,23], introducing inorganic particles [9,[24][25][26], and utilizing hybrid fillers [18]. An overview of the primary fillers employed in the shell layers of Co-WPCs can be found in Table 1.…”

Use of Inorganic Wastes as Fillers in Production of Polyester Composites and Evaluation of Properties of Obtained Composite

“…The use of calcium carbonate in nanoparticle size improves some physical properties of the composite. Glass fiber also increases the mechanical strength of the composite [16,17].…”