Influence of the Filler Particles’ Surface Morphology on the Polyurethane Matrix’s Structure Formation in the Composite

Abstract

This article presents the surface morphology effect of silicon carbide (SiC) particles on the polyurethane binder’s structure formation in a dispersed-filled composite. The difference in the morphology and surface relief of filler particles was ensured by the implementation of plasma chemical modification. As a result of this modification, the filler consisted of core-shell particles characterized by a SiC core and a carbon shell (SiC@C), as well as a carbon shell decorated with silicon nanoparticles (SiC@C/SiNP) or nanos (SiC@C/SiNW). The study of the relaxation properties of polyurethane composites has shown that the strongest limiting effect on the molecular mobility of boundary layer’s chain segments is exerted by a highly developed surface with a complex relief of SiC@C/SiNP and SiC@C/SiNW particles. An empirical method was proposed to find the polymer fractions spent on the formation of the boundary, transition and bulk layers of the polymer matrix in the composite. It was shown that the morphology of the filler particles’ surface does not affect the dependence of the boundary layer thickness on the filler’s volume fraction. However, with an increase in the degree of surface development, the boundary layer thickness decreases.

Thermal-Induced Percolation Phenomena and Elasticity of Highly Oriented Electrospun Conductive Nanofibrous Biocomposites for Tissue Engineering

“…The increase in elasticity E of un-annealed fibers (PLA-PANi:CSA) to an optimal concentration of filler PANi is due to the interactions of polymeric molecules (PLA matrix) with the surface of the filler particles, leading to restricted mobility of the attached molecules. The decrease in mechanical strength after the optimal concentration of PANi is expected due to the consequences of phase separation between molecular chains of PLA and filler PANi particles [ 41 , 42 ].…”

Structure-Morphology-Antimicrobial and Antiviral Activity Relationship in Silver-Containing Nanocomposites Based on Polylactide

“…The proportion of the boundary layer in the case of composites obtained in situ is quite large due to the small size of silver nanoparticles (3.7 nm versus 16 nm in composites formed by mechanical means). This layer with an altered structure (usually in the boundary layer, the molecular packaging is less dense than in the volume of the polymer [40]) may be responsible for the effects of enthalpy relaxation.…”

Study of Characterization of Activated Carbon from Coconut Shells on Various Particle Scales as Filler Agent in Composite Materials

“…However, composite properties are significantly affected by various factors, including the degree of conversion of the polymer matrix and the interphase, which require a high level of salinization because of the high surface area of the particles (Qi et al, 2019;Shalygina et al, 2021). However, the effects of the particle/matrix interface adhesion and particle loading on the mechanical properties of polymer composites are not discussed here.…”