Abstract
Tests of the strain sweep, frequency sweep and stress relaxation for raw natural rubber coagulated by microorganisms (NR‑m) and raw natural rubber coagulated by acid (NR‑a) were carried out with the use of a rubber process analyzer (RPA). The results showed that the storage torque, complex viscosity of NR‑m were higher than those of NR‑a while the loss factor was lower. The effect of temperature on viscosity of raw NR was studied following the Arrhenious‑Frenkel‑Eyring model. The viscous flow behavior of NR‑m was poorer than those of NR‑a. Furthermore, stress relaxation measurements of raw NR showed a longer period of relaxation for NR‑m.
Highlights
Natural rubber (NR) latex from Hevea Brasiliensis rubber process analyzer (RPA)[9]
natural rubber coagulated by acid (NR-a) and Natural rubber coagulated by microorganisms (NR-m) samples were swept at temperature 60 °C and a strain of 7%
The results indicate that the NR-m exhibits a higher elasticity and a lower internal friction compared with NR-a
Summary
Natural rubber (NR) latex from Hevea Brasiliensis rubber process analyzer (RPA)[9]. Rheological behaviorS is a renewable biosynthesis polymer with excellent of polymers is presumed to important role in affecting outstanding resilience, high strength and good processability and properties of final products[12].processability, etc[1,2,3]. In the explores the rheological properties of raw microbialproduction of raw natural rubber, the coagulation of coagulated NR by frequency sweep, strain sweep and fresh latex is an important process step of the effects stress relaxation using a RPA (MFR, Prescott UK).
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