| Abstract [eng] |
Cross-linked polymers were obtained by thiol-ene photo-click polymerization of acrylated soybean oil with structurally different dithiols, 1,3‒benzene dithiol and 1,4‒benzene dithiol. Reaction kinetics were investigated using different ratio of functional groups and two different photoiniciators, 2,2‒dimethoxy‒2‒phenylacetophenone and 2‒hydroxy‒2‒methyl‒phenyl‒propanone in different quantities. It was determined that the rate of photopolymerization and properties of obtained polymers depend on the ratio of acryl and thio groups, structure of dithiol, photoinitiator, and its quantity in the composition. Photopolymerization is faster and the more rigid polymers are obtained when ratio of acryl and thio groups is 1:1 and when 2,2‒dimethoxy‒2‒phenylacetophenone is used as photoinitiator. The insoluble fraction of polymers was (59–94) % after Soxhlet extraction with chloroform. It was found that synthesized polymers are amorphous materials with the glass transition temperature in the range of (-17 ‒ 1) ºC. Their decomposition temperature at the weight loss of 10 % is in the range of (317 ‒ 347) ºC. The better thermal and mechanical properties were shown by polymers cross-linked with 1,3‒benzene dithiol and 2,2‒dimethoxy‒2‒phenylacetophenone used as photoinitiator. The highest swelling value reached 70 % in chloroform and 45 % in toluene. The swelling values decreased with the increase of amount of photoinitiator. Photocross-linked polymers showed low biodegradability after 3 months of composting in the soil: weight loss was from 1 to 15 %. |
