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).
Publisher
National Academy of Sciences of Ukraine (Co. LTD Ukrinformnauka) (Publications)
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