ПРИРОДНО-СИНТЕТИЧНІ БЛОККОПОЛІМЕРИ, ОТРИМАНІ З ВИКОРИСТАННЯМ ОЛІГОМЕРНИХ ФОТОІНІЦІАТОРІВ

The aim of the work was to develop methods for the synthesis of natural-synthetic block copolymers (BСP) castor oil- (acrylate-vinylpyrrolidone) photoinduced radical polymerization and study of the properties. Synthesized oligomeric photoinitiators using 2-hydroxy-2-methyl-phenyl-propan-1-one (Darocur 1173) and 1-[4-(2-hydroxyethoxy)phenyl]- 2-hydroxy-2-methyl-1-propane-1-one (Irgaсur 2959) with isophorondiisocyanate groups, which were graft ed onto castor oil. BСPs were prepared based on oligomeric photoinitiators of castor oil at various molar ratios of oligomeric photoinitiator/acrylate/vinylpyrrolidone and BСP based on castor oil graft ed with ethylene glycol monomethacrylic ester, vinylpyrrolidone monomer (VP) and monomeric fotoinitiator Darocur 1173. The structure of block copolymers is confirmed by IR spectroscopy. Changes in the hardness of coatings over time by a pendulum device in the process of producing block copolymers are investigated. It is shown that the greater the proportion of acrylate, the higher the hardness of the coating. The impact strength for BCPs obtained using an oligomeric initiator, the castor oil-Darocur is the same, regardless of the amount of acrylate. Th is is due to the main contribution to this index of castor oil, which, as an elastic matrix, inhibits cracking of coatings. All BCPs have good elasticity, probably due to the castor oil block. The study of the properties of the obtained natural-synthetic block copolymers of castor oil-(acrylate-vinylpyrrolidone) showed that all of them can be used as coatings, but the optimal coating is BCP with 20% acrylate, since at good strength at impact, film elasticity when bending a metal plate and hardness, also has very good adhesion to metal. [ABSTRACT FROM AUTHOR]