Abstract
Monodisperse size crosslinked polymeric particles of specific chemical compositions, synthesized by emulsifier-free emulsion polymerization, were used as model fillers to study the effect of filler chemical composition on stress-strain behavior of rubbery composites. The modulus, E or G of filled composites increased while the stress and the strain at break decreased with increasing filler-matrix interactions. Physical crosslinking, either due to particle clustering or a network of filler particles with an adsorbed polymer layer supplemented chemical crosslinking. As a result, the overall crosslink density(chemical and physical) was effectively enhanced. The strength of the physical networks, and hence the stiffness of the composites increases with increasing particle-matrix interactions. However, excessively strong matrix-filler interaction would cause a loss of polymer flexibility at the particle-matrix interface, resulting in a decreased stress and elongation at break of the particle filled composites in the order PS > PMMA > PSVP.
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Cai, J.J., Salovey, R. Model filled rubber Part V Mechanical properties of rubbery composites. Journal of Materials Science 36, 3947–3953 (2001). https://doi.org/10.1023/A:1017922322114
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DOI: https://doi.org/10.1023/A:1017922322114