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Silica Reinforced Organic–Inorganic Hybrid Polyurethane Nanocomposites From Sustainable Resource
Author(s) -
Akram Deewan,
Ahmad Shahzada,
Sharmin Eram,
Ahmad Sharif
Publication year - 2010
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200900404
Subject(s) - polyurethane , polyol , thermogravimetric analysis , nanocomposite , materials science , polymer , chemical engineering , thermal stability , fumed silica , isocyanate , fourier transform infrared spectroscopy , polymer chemistry , composite material , engineering
Polyol/nanosilica organic–inorganic hybrids (Si/Lpol) were prepared through facile sol–gel chemistry. Tetraethoxyorthosilane (TEOS) and linseed polyol (Lpol) obtained by hydroxylation of linseed oil were used as inorganic and organic precursors, respectively. Si/Lpol was further treated with toluene‐2,4‐diisocyanate (TDI) to obtain silica embedded polyurethane (Si/LPU). The structure of the organic–inorganic hybrid was confirmed by FTIR, 1 H NMR, and 13 C NMR spectral analysis. The polyol/nanosilica network shows strong interaction with the remnant polyol backbone through hydrogen bonding, which also has bearing on T g of polymers. Morphological studies of Si/LPU show the formation of uniform, spherical silica nanoparticles of 2–30 nm size embedded in the polymer matrix. Si/LPU was further reinforced with 2 and 5 wt.‐% fumed silica (FS‐Si/LPUs); their morphology revealed a carpet layer formation on top of Si/LPU. Thermogravimetric analysis showed improved thermal stability of Si/LPU and FS‐Si/LPUs. The polymers exhibit mild to moderate antibacterial behavior against E. coli and S. aureus , respectively, and will pave way in plethora of biological and chemical applications as coating materials.