2022 (1) 5
https://doi.org/10.15407/polymerj.44.01.061
STUDYING OF THE NANOSTRUCTURIZED POLY(URETHANE-UREA) – POLY(VINYL CHLORIDE) BLEND MODIFIED BY AEROSILS
T.L. Malysheva,
Institute of macromolecular Chemistry 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 NAS of Ukraine, 48, Kharkivske shose, Kyiv, 02160, Ukraine,
e-mail: atolstov032@gmail.com
ORCID: 0000-0001-6016-9308
Polym. J., 2022, 44, no. 1: 61-67.
Section: Structure and properties.
Language: Ukrainian.
Abstract:
An influence of surface adsorption-active centers of fine amorphous silica on physical hydrogen bonding (H-bonding) network in polyurethaneurea (PUU) and nanostructurized polymer blend (PUU/30PVC) was studied by FTIR spectroscopy. PUU was synthesized by prepolymer approach in N,N-dimethylformamide (DMF) solution using poly(propylene glycol) of Mn = 1000, 2,4-tolylene diisocyanate and 2,4-tolylene diamin as a chain extender at a molar ratio of 1:2:1. The compositions were obtained by solution-casting technique using DMF as a solvent. It was found introducing fine silica with hydroxylated surface into PUU matrix enhances segregation of hard urethane-urea segments in oligoether matrix. The maximum of strengthening of the filled composites was observed when silica A-300 content reaches 2–3 % (by weight). Oppositely, introducing silica AM-300 with silylated (by (CH3)2SiCl2) surface into PUU initiates degrading domain structure of elastomer due to interactions between polar groups of chemisorbed molecules of chlorine-containing modifier and proton-donor groups of rigid segments.
Modified surface of silica has minor destabilization effect on H-bonding network in nanostructurized polymer-polymer blend. As a result, for producing filled composites without weakening interface interactions and, respectively, reducing the strength and optimal filler content (silica AM-300 or A-300) should be selected as high as 1 % (by weight).
Keywords: poly(urethane-urea) elastomer, poly(vinyl chloride), polymer blend, aerosol, interfacial interactions, mechanical strength.
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