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Open AccessArticle

Effect of Stabilizer States (Solid Vs Liquid) on Properties of Stabilized Natural Rubbers

1
Specialized center of Rubber and Polymer Materials in agriculture and industry (RPM), Department of Materials Science, Faculty of Science, Kasetsart University, Chatuchak, Bangkok 10900, Thailand
2
Office of research integration on target-based natural rubber, National Research Council of Thailand (NRCT), Chatuchak, Bangkok 10900, Thailand
*
Author to whom correspondence should be addressed.
Polymers 2020, 12(4), 741; https://doi.org/10.3390/polym12040741
Received: 29 February 2020 / Revised: 17 March 2020 / Accepted: 20 March 2020 / Published: 27 March 2020
(This article belongs to the Special Issue Elastomers: From Theory to Applications)
The main objective of this work is to study the effect of hydroxylamine sulfate or stabilizer states (solid vs liquid) on the storage hardening of natural rubber (NR). Several types of natural rubber samples were prepared: unstabilized NR samples and stabilized NR samples: (i) dry NR with 0.2 and 2.0 parts per hundred rubber (phr) of dry hydroxylamine sulfate, and (ii) natural latex with 0.2 and 2.0 phr of liquid hydroxylamine sulfate. The samples were characterized immediately (time 0) and after 12 weeks of storage at room temperature, respectively. We found that the Mooney viscosity, gel content, and Wallace plasticity of NR without a stabilizer increases with storage hardening for 12 weeks. However, two types of stabilized NR samples represent constant values of those three parameters, because hydroxylamine sulfate inhibits network and gel formation in NR. Interestingly, the mixing states (solid vs liquid) between natural rubber and the stabilizer affect the properties of stabilized NR. This could be explained by the better dispersion and homogeneous nature of liquid stabilizers in natural latex (liquid state), and thus the higher loading of the stabilizer in the liquid state. This is important, as the stabilization of NR properties as a function of time is required by rubber industry. This study is a utilization model from theory to application. View Full-Text
Keywords: natural rubber; natural latex; viscosity stabilizer; hydroxylamine sulfate; storage hardening natural rubber; natural latex; viscosity stabilizer; hydroxylamine sulfate; storage hardening
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Promhuad, K.; Smitthipong, W. Effect of Stabilizer States (Solid Vs Liquid) on Properties of Stabilized Natural Rubbers. Polymers 2020, 12, 741.

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