Production and Characterization of Non-Isocyanate Polyurethane/SiO2 Films Through a Sol-Gel Process for Thermal Insulation Applications

Production and Characterization of Non-Isocyanate Polyurethane/SiO2 Films Through a Sol-Gel Process for Thermal Insulation Applications

The reaction of cyclic carbonates with amines is the most attractive among the synthesis methods for isocyanate-free polyurethane. Non-isocyanate polyurethane films with SiO2 NPs fabricated by a sol-gel process are reported, where cyclic carbonates (CC) were produced under mild conditions by CO2 ins...

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Bibliographic Details
Published in:Polymers Vol. 11; no. 10; p. 1596
Main Authors: Noriega, Natalia E., Carrillo, Amanda, Castillo, Santos J., Mota, María L.
Format: Journal Article
Language:English
Published: Basel MDPI AG 29-09-2019
MDPI
Subjects:
Amines
Carbonates
Energy consumption
Environmental effects
Ethanol
Fourier transforms
Insulation
Isocyanates
Morphology
Nanoparticles
NMR
Nuclear magnetic resonance
Particle size distribution
Polyamines
Polymers
Polyurethane resins
Polyvinyl alcohol
Production costs
Scanning electron microscopy
Silicon dioxide
Sol-gel processes
Spectrum analysis
Thermal insulation
Thermogravimetric analysis
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Summary:The reaction of cyclic carbonates with amines is the most attractive among the synthesis methods for isocyanate-free polyurethane. Non-isocyanate polyurethane films with SiO2 NPs fabricated by a sol-gel process are reported, where cyclic carbonates (CC) were produced under mild conditions by CO2 insertion in an epoxide complex in the presence of LiCl. A reaction of CC and polyamines was carried out in a low concentration polymer matrix of PVA. The materials were characterized by 1H-NMR, FTIR, UV-Vis, SEM, TGA, DTG, and a KD2 pro technique. polymer FTIR results are consistent with the literature, even with the use of a non-conventional methodology, where the found chemical interactions values were 3330, 2930 and 1637 cm−1. There are differences in the polymers’ morphologies due to the presence and absence of SiO2 NPs according to SEM, where the spherical morphology and homogenous particle size distribution of NPs around 100 nm. According to TGA results, all polymers showed their last stage decomposition after 300 °C and polymers with higher concentration of NPs showed even better stability. Due to the obtained results, the polymers have the potential to be used for thermal insulation without negative effect on the environment.
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ISSN:2073-4360
2073-4360
DOI:10.3390/polym11101596