Abstract
Crosslinking of poly(vinyl chloride) (PVC) fibers has been studied by nucleophilic substitution with 2-dibutylamino-4,6-dimercapto-1,3,5-triazine (DB) in the presence of sodium hydroxide and tetra-n-butylammonium bromide (TBAB) in water. The effects of concentration of the different components, the temperature and the reaction time on the crosslinking of PVC fibers have been investigated individually to determine kinetic parameters and reaction mechanism. It has been found that the cationic surfactant (TBAB) has a significant effect on the formation of crosslinked polymer network. TBAB reacting with DB forms a mono-tetra-n-butylammonium salt of DB (DBTBA). This compound is born a crosslinking agent and surface active agent. To reach high crosslinking density, the concentration of DBTBA salt must be higher than the concentration of its saturation point. If the reaction temperature is lower than the Tg of PVC fibers the crosslinking density low (under 5%) the reaction hardly occurs. The crosslinking reaction has been treated as a pseudo-first-order reaction. The rate constant (k) is 0.0230 min−1 at 90°C and the activation energy is 55.5 kJ mol−1. Elemental analysis data prove the crosslinking reaction takes place. By decreasing the temperature of the reaction mixture, the ratio between crosslinking and branching decreases.
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Jando, T., Mori, K. Crosslinking of Poly(vinyl chloride) Fibers with 2-Dibutylamino-4,6-dimercapto-1,3,5-triazine in Water. Polym J 22, 793–802 (1990). https://doi.org/10.1295/polymj.22.793
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DOI: https://doi.org/10.1295/polymj.22.793