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Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received January 29, 2008
Accepted June 4, 2008

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Enthalpy profile-cure state relationship of compounded rubber by differential scanning calorimetry

Kyo-Chang Choi Eun-Kyoung Lee^1† Sei-Young Choi¹

Strategy Planning Team/Bio Development Team Meta Biomed, 1115-6, Cheongwongun, Choongbuk 363-911, Korea ¹Department of Applied Chemistry, Cheongju University, Cheongju 360-764, Korea

eklee@cju.ac.kr

Korean Journal of Chemical Engineering, January 2009, 26(1), 295-299(5), 10.1007/s11814-009-0051-8

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Abstract

Differential scanning calorimetry (DSC) was applied to natural rubber (NR) and NR/recycled natural rubber (RNR)(NR/RNR) blend to understand and optimize the state of cure, which is based on the value of the exothermic reaction obtained in process of vulcanization. Swelling and mechanical data were investigated with the increase of cure time from 15 to 35 minutes with an interval of 5minutes and compared with the DSC enthalpy data. With the increasing cure time, cure enthalpy was decreased and a negative, while cure enthalpy was a positive value in 35-NR and 35-NR/RNR when cure time was over 35 minutes due to the reversion. Swell index (Si) was gradually decreased but increased slightly in the case of both NR and NR/RNR cured for 35 minutes. The study also indicated that cure enthalpy data was very precise and fast to predict the cure state of the NR and NR/RNR blend.

Keywords

Recycled Natural Rubber Exothermic Reaction Vulcanization Cure Enthalpy

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