Rheological behavior of natural rubber latex in the presence of surface‐active agents

Abstract

SynopsisThe rheological behavior of centrifuged and creamed natural rubber latex concentrates and the effect of surface-active agents such as casein, polyvinyl alcohol (PVA), sodium alginate, and sodium carboxymethylcellulose ( NaCMC ) were studied at different shear rates and temperatures. The study showed that creamed latex, prepared using tamarind seed powder, is more sensitive to shear rate and temperature than centrifuged latex. The pseudoplasticity and viscosity of the latices can be increased by the addition of surface-active agents, and the effect varies with the type of surfaceactive agents. The behavior of the latices toward temperature is also affected by the addition of surface-active agents, and maximum effect is observed for polyvinyl alcohol and least for sodium alginate.

Morphology and mechanical and viscoelastic properties of natural rubber and styrene butadiene rubber latex blends

“…Moreover, it is reported 32 that a dry, natural or synthetic rubber with superior processing properties could be obtained by blending casein rubber master batches. Similar results with NR latex were reported by Dogadkin et al 33 and Peethambaran et al 34 The tensile strength values of NR/SBR blends prevulcanized by CV and EV systems are given in Tables V and VI, respectively. The NR shows higher tensile strength values than the SBR and blends.…”

Flow properties of unvulcanised natural rubber/carboxylated styrene butadiene rubber latices and their blends

“…This has an important implication for polymer processing. Temperature has a strong effect on the viscosity of the dispersions 22–24. In all cases, the viscosity of individual latices and their blends decrease with increase in temperature.…”

“…Power law is widely used as a model for non‐Newtonian fluids 14, 15, 24. It holds for many polymer solutions and can be described by Newtonian, shear‐thinning, and shear‐thickening behavior in terms of the power factor n .…”

Electrical conductivity and mechanical properties of polyaniline/natural rubber composite fibers

“…38 After thoroughly mixing these components, dry PANI-EB was added (to prepare the 0.5, 1, 2, 5, and 10% w/w PANI/NR composites, 0.116, 0.234, 0.472, 1.217, and 2.57 g PANI were added). The dispersions were subsequently mixed mechanically for 15 min.…”