Swelling and static-dynamic mechanical behavior of mica-reinforced linear and star-branched polybutadiene composites

Abstract

Physical properties of mica-reinforced linear (LPB) and star-branched polybutadiene (SPB) composites have been studied with special reference to the effect of silane coupling agent, degree of crosslinking, and degree of mica loading, as well as the molecular architecture of polybutadienes. Tensile properties increase and swelling decreases with addition of mica for linear polybutadiene. Star-branched polybutadiene shows a reverse behavior, especially beyond 5% of mica. The improvements in mechanical properties are more pronounced in the case of silane-treated mica compositions of both type of polybutadienes. Dynamic mechanical spectra were obtained for linear and star-branched polybutadienes. Effects of mica loading and silane treatment on dynamic moduli are discussed. Dynamic mechanical moduli ( E, EЉ) of composites increase with increasing mica content for linear polybutadiene but decrease for star-branched polybutadiene beyond certain mica loadings. Effective damping regions were determined in terms of frequency and temperature. The glass transition temperature (T g ) increased slightly, and the damping peak (tan d) broadened due to the rubber-filler interaction, especially after silane treatment for both polymers.

Uncured and cured state properties of fly ash filled unsaturated polyester composites

“…Thereby, the formation of charge transfer complex is inhibited by the surface coverage that means a decrease in cure time 11, 12. Similar observations, increase in the rate of vulcanization of mica reinforced polybutadiene composites and glass bead filled polyester composites with surface silanization, were also reported by Nugay et al,13 Lee and Han,11 and Shieh and Hsu,12 respectively.…”

Interfacial studies of carbon fibre / polycarbonate composites using dynamic mechanical analysis

“…Results of using the DMA technique to characterise interfacial effects in particulate and fibre-reinforced polymer composites have been reported in the literature [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Most of the studies were carried out in temperature sweeps at fixed frequencies (isochronal conditions) near transition regions of the matrix, specially covering the glass transition region.…”

Property optimization in nitrile rubber composites via hybrid filler systems

“…23 Figure 3 presents elongation-at-break values of the composites. Similar to the behavior observed for the polybutadiene composites, 11 addition of mica increases the ductility of the samples. Sim- observed that with the addition of two-dimensional fillers such as mica in the polypropylene matrix mica-reinforced polypropylene becomes more and more ductile, leading to higher elongation.…”