Effect of co-agent type on curing kinetics of vinyl-methyl siloxane and phenyl-vinyl-methyl siloxane elastomers

Yıl 2024, , 1 - 16, 28.06.2024

Davut Aksüt Elif Kaymazlar Murat Şen

https://doi.org/10.37094/adyujsci.1425531

Öz

This study investigated the effect of Type I co-agents Zinc Acrylate (ZDA), Zinc Methacrylate (ZDMA) and Type II co-agents Triallyloxy-1,3,5-triazine (TAC), and 1,3,5-triallyl-1,3,5- triazine (TAIC) on the curing kinetics of vinyl methyl polysiloxane (VMQ) and phenyl vinyl methyl polysiloxane (PVMQ) elastomers. 2,5-Dimethyl-2,5-di(tertiary-butylperoxyl) hexane (DBPH) was used as a crosslinker. The rheological analyses were performed with a Moving Die Rheometer (MDR) at four different temperatures. Cure curves were evaluated according to 1th and nth curing kinetics and curing rate constant (k), reaction degree (n), and activation energy (Ea) values were calculated. When the results were evaluated, it was seen that the k, rate constant increased with the addition of TAC, TAIC, and ZDA in the compounds, whereas the k, rate constant value decreased with the use of ZDMA. It is thought that the reason for this is that ZDMA forms a more stable 3° radical due to the methyl group in its structure. ZDA was found to be the accelerator that increased the cure rate of PVMQ and VMQ. When the activation energies obtained were examined, it was seen that the activation energies for PVMQ were higher than the energies obtained for VMQ. The reason for this was attributed stabilization of free radicals by the phenyl group in the structure of the PVMQ

Anahtar Kelimeler

Activation energy, Co-agent, Peroxide curing, Silicone elastomer

Etik Beyan

BU çalışmada herhangi bir Etik Kurul Onay Belgesine ihtiyaç duyulmamaktadır.

Kaynakça

• [1] Jerschow, P., & Wacker-Chemie GmbH., Silicone Elastomers Report 137. In Rapra Review Reports, 12, (5), 2001.
• [2] S.K. Henning & R. Costin,Fundamentals of curing elastomers with peroxides and coagents, Rubber World 233(5):28-35, 2006.
• [3] Wang H, Ding Y& Zhao S., Effects of Co-Agents on the Properties of Peroxide-Cured Ethylene-Propylene Diene Rubber (EPDM), Journal Of Macromolecular Scıence, Part B: Physıcs, 55(5), 433–444, 2016.
• [4] Palys, L. H. & Callais, P. An A., Understanding Organic Peroxides to Obtain Optimal Crosslinking Performance. Rubber World, 229:11, 35, 2003.
• [5] Kaymazlar E., Effect of Accelerator Type and Ratio on The Relaxatıon Behaviors of Silicone Elastomers, Master’s Thesis, Ondokuz Mayis University Graduate School of Sciences Department of Chemisrty, Samsun, Turkey, 2018.
• [6] Kruželák J, Kvasničáková A, Hložeková K & Hudec, Influence of dicumyl peroxide and Type I and II coagents on cross-linking and physical–Mechanical properties of rubber compounds based on NBR, Plastıcs, Rubber and Composites, 49(8):1-14, 2020.
• [7] V. Bheemreddy, Z. Huo, K. Chandrashekhara & R. A. Brack, Modeling and simulation of cure kinetics and flow in cavity-molded composites, Journal of The American Helicopter Society 61, 022004, 2016.
• [8] Atkins, P.; de Paula, J. Physical Chemistry. Part 2, 22 The rates of chemical reactions, Oxford University Press. page 791, 2014.
• [9] I Surya, L Sukeksi& N Hayeemasae, Studies on cure index, swelling behaviour, tensile and thermooxidative properties of natural rubber compounds in the presence of alkanolamide, IOP Conf. Series: Materials Science and Engineering 309 012060, 2018.
• [10] Ding, R., Leonov, A. I. ve Coran, A. Y., A study of the vulcanization kinetics of an accelerated-sulfur SBR compound, Rubber Chemistry and Technology, 69: 1, 81–91, 1996.
• [11] Yang, Sen lin, Zhi Hua Wu, Wei Yang, & Ming Bo Yang, Thermal and Mechanical Properties of Chemical Crosslinked Polylactide (PLA), Polymer Testing 27(8):957–63, 2008.
• [12] García-Quesada, J. C. & Gilbert, M., Peroxide crosslinking of unplasticized poly(vinyl chloride), Journal of Applied Polymer Science, 77: 12, 2657–2666, 2000.
• [13] Búcsi, A. ve Szőcs, F., Kinetics of radical generation in PVC with dibenzoyl peroxide utilizing High-Pressure Technique, Macromolecular Chemistry, and Physics, 201: 4, 435–438, 2020.
• [14] Isayev, A.I., Deng, J.S., Non-isothermal vulcanization of rubber compounds, Rubber Chem Technol, 61, 340-361, 1998.
• [15] Dikland, H. G., Ruardy, T., Vanderdoes, L. ve Bantjes, A., New Coagents in Peroxide Vulcanization of Edpm, Rubber Chemistry and Technology, 66: 5, 693–711, 1993.
• [16] I. Surya, H. Ismail, A.R. Azura, Alkanolamide as an accelerator, filler-dispersant and a plasticizer in silica-filled natural rubber compounds, Polym. Test., 32, 1313-1321, 2013.