Zeng F, Guo X, Sun L, He X, Zeng Z, Liu Z. Non-isothermal crosslinking of ethylene vinyl acetate initiated by crosslinking agents: kinetic modelling.
RSC Adv 2022;
12:15623-15630. [PMID:
35685181 PMCID:
PMC9126645 DOI:
10.1039/d2ra01994a]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Accepted: 05/17/2022] [Indexed: 12/02/2022] Open
Abstract
The non-isothermal crosslinking process of ethylene vinyl acetate (EVA) initiated by several crosslinking agents was studied by using differential scanning calorimetry (DSC). The crosslinking agent tert-butylperoxy 2-ethylhexyl carbonate (TBEC) exhibited much shorter reaction time and lower reaction temperature. The effect of the crosslinking agent TBEC on the EVA crosslinking process was further analyzed by using Avrami, Ozawa, Mo and Flynn-Wall-Ozawa (FWO) methods, respectively. The small fluctuations in the values of Avrami exponent n and Mo parameter a indicate that the EVA crosslinking mechanism is basically unchanged with increasing heating rate and crosslinking agent content. The change of the Ozawa exponent m is presumably due to the increase in viscosity of EVA/TBEC samples during the crosslinking process. The heating/cooling function F(T) values and the activation energy Ea are dependent on the conversion rate α. In addition, Ea shows irregular changes in the early stages of crosslinking, and increases with the increase of conversion rate α in the later stages of crosslinking.
The kinetic parameter Ea of EVA crosslinking reaction initiated by a peroxide crosslinking agent showed irregular changes in the early stage of crosslinking, and increase with the increase of conversion rate α in the later stage of crosslinking.![]()
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