2016 (4) 1

https://doi.org/10.15407/polymerj.38.04.279

Phase morphology and properties of sequential polyurethane butadiene – polymethylmethacrylate semi-IPNs

О.О. Brovko, L.М. Sergeeva

Institute of Macromolecular Chemistry of NAS of Ukraine

48, Kharkivs’ke shose, Kyiv, 02160, Ukraine

Polym. J., 2016, 38, no. 4: 279-287.

Section: Structure and properties.

Language: Ukrainian.

Abstract:

Phase morphology and damping and mechanical properties of sequential polyurethane butadiene – polymethylmethacrylate semi-IPNs were studied. Two types of semi IPNs: semi-1-IPNs based on linear polymethylmethacrylate and cross-linked polyurethane butadiene synthesized from hydroxyl-containing butadiene rubber, diisocyanate, and trimethylolpropane; and semi-2-IPNs based on linear polyurethane butadiene and cross-linked copolymer of methylmethacrylate and triethylene glycol dimethacrylate were synthesized. Polyurethane component of both semi-IPNs was formed first in methylmethacrylate or in blend of methylmethacrylate and triethylene glycol dimethacrylate. After the structuring of polyurethane component by using ultraviolet irradiation of wave length l=365 nm and 2, 2-dimethoxy-2-phenylacetophenone as an initiator the free-radical polymerization of methacrylic one was carried out. Viscoelastic behavior of IPNs synthesized was studied by dynamical mechanical analysis (DMA). Using the obtained DMA data their morphologies were estimated as well. Semi-IPNs studied were shown to be phase separated systems and their damping properties to depend to a large extent on both chemical structure of their initial components and formation in semi-IPNs considerable by volume an interphase area. It was found that every of the semi-IPN components plays their own specific role: so, (methyl)methacrylate component provides appropriate level of internal friction that sets conditions for good damping properties in the broad range of temperatures (or frequencies) and urethane butadiene one does desirable mechanical properties in particular tensile strength and expands negative temperature range of mechanical loss. Using the thermomodulate differential scanning calorimetry data and Fox’s equation the component rations within IPNs interphase areas were calculated.

Key words: Semi-IPNs, phase morphology, damping and mechanical properties.

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