DOI: 10.17586/2226-1494-2018-18-1-65-71


INTERNAL STRUCTURE STUDY OF POLYURETHANE-POLYUREA BY NUCLEAR MAGNETIC RESONANCE METHOD

S. A. Ostanin , V. V. Zuev, M. V. Mokeev


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Article in Russian

For citation: Ostanin S.A., Zuev V.V., Mokeev M.V. Internal structure study of polyurethane-polyurea by nuclear magnetic resonance method. Scientific and Technical Journal of Information Technologies, Mechanics and Optics, 2018, vol. 18, no. 1, pp. 65–71 (in Russian). doi: 10.17586/2226-1494-2018-18-1-65-71

Abstract

 We study the effect of chemical composition, solubility parameter of the segments and their length on the size of the domains, interphase thickness of the interfacial layer and the degree of phase separation in polyurethane-polyurea synthesized from oligomeric diisocyanate, cuamine M and polyols based on polyethylene oxide, polypropylene oxide and polybutadiene. The measurements were performed by a variety of techniques with specific pulse sequence such as proton spin-diffusion solid-state nuclear magnetic resonance spectroscopy, nuclear magnetic resonance spectroscopy with cross-polarization. The measurements were carried out on Bruker Avance II 500 operating at proton frequency equal to 500.13 MHz. It was found that the properties of segmented polyurethane-polyurea depend directly on the degree of phase separation between the hard segments and the mobile matrix. The study of the transverse relaxation time of the samples showed that the molecular mobility in polyurethane is represented by four components. Understanding of the polymer formation process, components distribution by volume, and knowledge about predisposition to form certain connections can be used for creation of polymeric materials with the required characteristics important for the industry


Keywords: 1H spin-diffusion solid-state NMR, polyurethane, polyurea, domain size, interphase thickness, phase separation degree, block-copolymer, relaxation processes

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