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An attempt to prepare graft copolymer of natural rubber, NR and poly(stearyl methacrylate), PSMA, was made to improve mechanical properties of NR, since the grafted PSMA was composed of crystallizable stearyl groups as a nucleating agent and methacrylate units. The graft-copolymerization of stearyl methacrylate (SMA) onto deproteinized natural rubber (DPNR) was performed in latex stage with tert-butylhydroperoxide...
Hybrid filler systems consisting of precipitated silica and kaolin modified with a sodium salt of rubber seed oil (SRSO) were studied in blends of natural rubber (NR) and polybutadiene rubber (BR). Substitution of 5–10 phr (parts per hundred rubber) of silica with SRSO modified kaolin imparted lower Mooney viscosity and higher cure rate for the mixes, thereby improving processing characteristics....
Strain Induced Crystallization (SIC) of Natural Rubbers (NR) with different network chain densities (ν) is studied. For the weakly vulcanized rubber, the melting stretching ratio λm at room temperature is the lowest. This is correlated with larger crystallites in this material measured by in situ WAXS, suggesting their higher thermal stability. SIC kinetics is then studied via stretching at various...
In order to simulate the effect of non-rubber components on strain-induced crystallization (SIC) in natural rubber (NR), sacrificial metal-ligand bonds are incorporated, for the first time, into cis-1,4 polyisoprene cured by sulfur. The incorporation of sacrificial bonds is found to bring in much smaller onset strain for SIC and higher crystallinity compared with the cis-1,4 polyisoprene with sulfide...
Graft-copolymerization of vinyl monomer containing silica precursor, p-styryltrimethoxysilane, onto natural rubber microparticles was performed in latex stage to form three-dimensional networks of nanosilica. After the latex was cast into a film, morphology observation by transmission electron microscopy showed that the natural rubber microparticles were dispersed in organic–inorganic nanomatrix consisting...
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