2021 (1) 3
https://doi.org/10.15407/polymerj.43.01.019
MISCIBILITY OF POLY(URETHANE-UREA) ELASTOMERS WITH CHLORINATED POLY(VINYL CHLORIDE)
T.L. MALYSHEVA,
Institute of Macromolecular Chemistry of the NAS of Ukraine, 48, Kharkivske shose, Kyiv, 02160, Ukraine
e-mail: malysheva_tat@ukr.net
ORCID: 0000-0002-3046-6819
A.L. TOLSTOV,
Institute of Macromolecular Chemistry of the NAS of Ukraine, 48, Kharkivske shose, Kyiv, 02160, Ukraine
e-mail: a.tolstov@ukr.net
ORCID: 0000-0001-6016-9308
Polym. J., 2021, 43, no. 1: 19-25.
Section: Structure and properties.
Language: Ukrainian.
Abstract:
Effect of a chemical structure of poly(ether-urethane-urea) (PUU) elastomers on a miscibility of their blends with chlorinated poly(vinyl chloride) (cPVC) has been studied by FTIR and DSC. The segmented PUU were synthesized by prepolymer approach in N,N-dimethylformamide (DMF) solution. PUU-1 was synthesized using poly(propylene glycol) (PPG) of Mn = 1000, mixture of 2,4- and 2,6-isomers of tolylenediisocyanate (TDI) in a ratio of 65:35 (by weight) and 4,4´-methylenedianiline as a chain extender at a molar ratio of 1:2:1. PUU-2 was prepared based on poly(tetramethylene glycol) (PTMG) of Mn = 1000, TDI and cyanoethylated ethylene diamine at a molar ratio of 2:3:1. The polymer-polymer blends were obtained via solution casting technique using DMF as a solvent. It was found a miscibility of the polymers enhances due to a formation of hydrogen or donor-acceptor bonding between polar NH urethane-urea or nitrile groups of hard PUU segments and chlorine of cPVC. According to DSC results the polymer-polymer systems stabilized by stronger donor-acceptor bonding are characterized by single glass transition temperature, Tg, a position of which is higher than that of the theoretical one, TFg, calculated in full composition range via Fox’s equation. When stabilization of polymer-polymer blend with 30 % (by weight) of cPVC performs by weaker hydrogen bonding we observed a formation of mixed phase and the composite is characterized by appearance of three relaxation transitions. Increasing cPVC content reduces a miscibility of the components and biphasic structure of the composites forms. Comparative analysis of experimental and theoretical (additive) tensile strength vs composition dependencies demonstrates an impact of donor-acceptor interface interactions on strength of the polymer composites obtained.
Keywords: poly(urethane-urea) elastomer, chlorinated poly(vinyl chloride), interfacial interactions, mechanical strength.
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Received 02.02.2021