Study of Dicumyl Peroxide in Crosslinking Process of a SBS-Based Pressure Sensitive Adhesive
DOI:
https://doi.org/10.12974/2311-8717.2018.06.2Keywords:
Adhesives, Crosslinking process, Thermoplastic elastomer.Abstract
The styrene-butadiene-styrene (SBS) is a thermoplastic copolymer commonly used as pressure sensitive adhesive (PSA), due its they are highly flexible and elastics, that produce high cohesive strength that results in physical interactions caused by polystyrene (PS) blocks. However, SBS-based PSA’s restrain their adhesion properties around their glass transition temperature (Tg), so it is necessary to add a crosslinking agent to increase their thermal resistance. Crosslinking is an important process in adhesives formulations, due that the mechanical properties of adhesive improve, but not enough information I published about the kinetic of that process. One of most studied crosslinking agent for adhesive formulations is dicumyl peroxide (DCP), which shows a good combination of physical and chemical properties to adhesive during crosslinking process. This report presents a crosslinking process using DCP as crosslinking agent. The study of kinetic parameters was determined by differential scanning calorimetry (DSC) in isothermal and dynamic conditions, from which the order of the crosslinking process reaction was found to be first order, according to the Kissinger and Ozawa models. The adhesive and cohesive strength was evaluated through the failure criterion between the bonds of the adhesive line using the single lap join method (SLP), showing that the best performance was that of the formulation made from resin Sylvalite RE100L and 0.81phr of DCP.
References
Chu, SG. Viscoelastic properties of pressure sensitive adhesives, Satas D. Handbook of pressure sensitive adhesive technology. 2nd ed. New York: Van Nostrand Reinhold, 1989.
Chu HH, Chiang WL, Chuang, KS. Viscoelastic and adhesive properties of PMMA-b-PtBA with tackifier. Int J Adhe Adhe 2012; 38: 89-94. https://doi.org/10.1016/j.ijadhadh.2012.05.005
Salazar-Cruz, BA, Rivera-Armenta, JL, García-Alamilla, R, Mendoza-Martínez, AM, Esquivel-De la Garza, A, Moctezume-Espiricueto, S. Thermal evaluation of curing of SBR based adhesives using dicumyl peroxide. Q Nova, 2015; 38: 651-656. https://doi.org/10.5935/0100-4042.20150067
Wu G, Jiang Y, Ye L, Zeng S, Yu P, Xu W. A novel UVcrosslinked pressure-sensitive adhevise based on photoinitiator-grafted SBS. Int J Adhe Adhe, 2010; 30: 43-46. https://doi.org/10.1016/j.ijadhadh.2009.08.002
Rahul, R, Kitey, R. Effect of cross-linking on dynamic mechanical and fracture behavior of epoxy variants. J Comp Part B: Eng, 2016; 85: 336-342. https://doi.org/10.1016/j.compositesb.2015.09.017
Bilyeu, B, Brostow, W, Mernad, K. Epoxy thermoset and their applications II: Thermal analysis. J Mat Educ. 2000; 22: 107- 130.
Ren, R, Xiong, X, Ma, X, Liu, S, Wang, J, Cen, P, Zen, Y. Isothermal curing kinetics and mechanism of DGEBA epoxy reins with phtalide-containing aromatic diamine. Therm Acta, 2016; 623: 15-21. https://doi.org/10.1016/j.tca.2015.11.011
Hernández-Martínez, T, Salazar-Cruz, BA, Rivera-Armenta, JL, Chávez-Cinco, MY, Méndez-Hernández, ML, Páramo- García, U. Adhesives applications and properties, In Tech Open, Croatia, 2016.
Salazar-Cruz, BA, Rivera-Armenta, JL, Mendoza-Martínez, AM, Esquivel de la Garza, A, Moctezuma-Espiricueto, S. Infrared Spectroscopy, InTech Open, Croatia, 2015.
Zielińska, AJ. Ph D Thesis, University of Twente, Enschede, the Netherlands, 2011.
Wang, J, Sun, J, Wang, F, Ren, B. Thermal decomposition behaviors and kinetic properties of 1,8- naphtalic anhydride loaded dense nano-silica hybrids. App Surf Sci, 2013; 274: 314-320. https://doi.org/10.1016/j.apsusc.2013.03.051
Kissinger, HE. Reaction kinetics in differential thermal analysis. Anal Chem. 1957; 29:1702-1706. https://doi.org/10.1021/ac60131a045
Dannenberg, EM, Jordan, ME, Cole, HM. Peroxide crosslinked carbono black polyethylene compositions. Polym Sci Part A: Polym Chem, 1958; 31: 127-153.
Escoto Palacios, MJ. Ph D Thesis, Universidad de Alicante, España, 1995.
Kok, KM. Thermal behavior and kinetics of crude oils at low heating rates by differential scanning calorimeter. Fuel Proc Tech, 2012, 96: 123-127. https://doi.org/10.1016/j.fuproc.2011.12.027
Vallat, MF, Ruch, F, David, MO. A structural study of EPDM networks-the influence of the crosslinking mode on their microscopic structure. Eur Polym J, 2004; 40: 1575-1586. https://doi.org/10.1016/j.eurpolymj.2004.01.026
Bak, KM, Kalaichelvan, K, Vijayaraghavan, GK, Dinesh, M, Arumugam, V. Study of the effect of adhesive thickness of single lap joints using acoustic emission and FEA. Inst- Non_Destruc Test Cond Monit, 2013; 55: 35-41. https://doi.org/10.1784/insi.2012.55.1.35