Silica Reinforced Organic–Inorganic Hybrid Polyurethane Nanocomposites From Sustainable Resource
✍ Scribed by Deewan Akram; Shahzada Ahmad; Eram Sharmin; Sharif Ahmad
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 488 KB
- Volume
- 211
- Category
- Article
- ISSN
- 1022-1352
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✦ Synopsis
Abstract
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.
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