Abstract
A series of novel polyurethanes containing cross-linked siloxane in the side chain (SPU) were successfully synthesized through a sol-gel process. The SPU was composed of 0%â20% N-(n-butyl)-3-aminopropyltriethoxysilane (HDI-T) modified hexamethylene diisocynate homopolymer. The effects of HDI-T content on both the structure and properties of SPU were investigated by Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), mechanical properties tests, gel content test, water contact angle measurement and water absorption test. FT-IR, XPS and XRD results confirmed the successful incorporation of HDI-T onto polyurethanes and the formation of SiâOâSi. The surface roughness and the Si content of SPU enhanced with the increase of HDI-T content. Both crystallization and melting temperature shifted to a lower point after the incorporation of HDI-T. The hydrophobicity, tensile strength, Youngâs modulus and pencil hardness overall increased with the increasing of HDI-T content, whereas the thermal stability and the elongation at break of SPU slightly decreased.
Highlights
Polyurethanes (PUs) are used in numerous applications such as coatings, adhesives, fibers, foams, rubbers, thermoplastic elastomers and composites [1,2,3,4,5,6,7]
A series of SPU hybrids and films were synthesized on the basis of the hexamethylene diisocyanate (HDI)-T and NBATPS
Stable hybrids and films were obtained by the addition of 0, 5, 10, 15 and 20 mol % HDI-T to SPU, respectively
Summary
Polyurethanes (PUs) are used in numerous applications such as coatings, adhesives, fibers, foams, rubbers, thermoplastic elastomers and composites [1,2,3,4,5,6,7] It is the flexibility in selection of monomers from a great variety of diisocyanates, polyester and chain extenders, as well as the ability to form different types of molecular architectures that provide PUs with many excellent properties such as toughness, abrasion resistance, mechanical properties and chemical resistance [8,9,10,11,12]. There is still a need to improve properties of PUs with the emphasis on their hydrophobicity and mechanical properties This can be achieved by varying the microstructures of PUs or incorporating inorganic fillers. Various PU/polysiloxane hybrids, PU/alkoxysilane hybrids, PU/acrylic hybrids, PU/epoxy resin hybrids, were prepared to offer
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