Photopolymerization of trimethylolpropane triacrylate in a matrix of linear polymers
The kinetics and efficiency of photopolymerization of trimethylolpropane triacrylate (TMPTA) in a matrix of linear polymers: poly(vinyl chloride) (PVC), poly(methyl methacrylate) (PMMA) and polystyrene (PS) has been investigated. On the basis of the parameters determined (reaction rate, conversion degree, quantum yield and kinetic chain length), it was fund that photopolymerization of TMPTA is the most efficient in a blend with PVC. Miscibility of mixture components (monomer–polymer) was found to affect the course of the photoreaction. The lowest efficiency was therefore observed in the TMPTA–PS system with a limited miscibility of components. In the presence of linear polymers photopolymerization of TMPTA occurs with high efficiency on high-energy UV irradiation (intensity of 600 mW/cm2) and UV-B and UV-A irradiation (1,7 mW/cm2) as well as in the sunlight. Photopolymerization of TMPTA is accompanied by grafting with the participation of a linear polymer–matrix.
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