Effect of Carbon Black Content on Curing Behavior of Polysulfide Coatings


Journal: Vol.12, No.2, Spring 2018 - Article 5   Pages :  103 Until 112



Article Code:
PCCC-2018-03-02-377

Authors:
Zohreh KaramiDepartment of Polymer Engineering
Omid Moini Jazani: University of Isfahan - Chemical engineering
Amir Hossein Navarchian: University of Isfahan - Chemical engineering
M.R. Saeb: Institute for Color Science and Technology - Departments of Resin and Additives


Article's abstract:

Polysulfide is well known elastomer for use in aerospace applications due to providing flexible coating and chemically resistant sealants. In this work, the effects of carbon black content on curing behavior of polysulfide elastomer were investigated and Rheological properties for samples with different filler content 15, 20 and 25 phr were evaluated by rheometric mechanical spectrometer RMS. According to RMS analysis, sample with 20 phr carbon black had minimum gel point temperature and loss factor and highest elasticity. Also, the time sweep test for the optimal sample resulted from temperature and frequency sweep at 90°C was done and gel time obtained less than a few minutes. From the dynamic differential scanning calorimetry DSC diagram for polysulfide with 20 phr carbon black observed two exothermic peaks in heat flow for uncured sample. The first peak indicated the curing of polysulfide elastomer and second peak may be attributed the curing of resole resin and formation of methylene linkage.


Keywords:
Polysulfide elastomer, Carbon black, Rheological properties, Cure behavior

References:
References 1. J.D. Zook, D.W. Jordan, D.M. Willard, G. Jones,M. Cosman, High strength polymers and aerospace sealants therefrom, US Pat. 6486297, 2002. 2. M.A. Cosman, Polymer blend and compositions and methods for using the same, US Pat. 20080199694, 2009. 3. E.I. Zaitseva,A.A. Donskoi, Sealants based on polysulfide elastomers. Polymer Science. Series D, 1(2008), 289-297. 4. J. Donaldson, S. Grimes, A. Houlson,S. Behn, Curing of a polysulfide sealant with sodium birnessite. Journal of applied polymer science, 77(2000), 1177-1181. 5. M. Abdouss, T. Farajpour,M. Derakhshani, The effect of epoxy-polysulfide copolymer curing methods on mechanical-dynamical and morphological properties. Iran. J. Chem. Chem. Eng. Vol, 30(2011). 6. B. Zhou, J. Zhang, Q. Wang,Q. Chen, Improvement in compression performance of the polysulfide sealant by thiol‐acrylate reaction. Polymer Engineering


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Manager-in-Chief:
Prof. Zahra Ranjbar
Editor-in-Chief:
Dr. Farahnaz Nourmohammadian
Assistant Editor:
Dr. Mozhgan Hosseinnezhad
ISSN:
2008-2134
ISSN (online):
2383-1790
Publisher:
Institute for Color Science and Technology (ICST)

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