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Structure and properties of polyurethane–silica nanocomposites

✍ Scribed by Zoran S. Petrović; Ivan Javni; Alan Waddon; György Bánhegyi

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
634 KB
Volume
76
Category
Article
ISSN
0021-8995

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✦ Synopsis

Nanocomposites with different concentrations of nanofiller were prepared by adding nanosilica filler to the single-phase polyurethane matrix. A control series was prepared with the same concentrations of micron-size silica. The nanosilica filler was amorphous, giving composites with the polyurethane that were transparent at all concentrations. The nanocomposites displayed higher strength and elongation at break but lower density, modulus, and hardness than the corresponding micron-size silicafilled polyurethanes. Although the nanosilica showed a stronger interaction with the matrix, there were no dramatic differences in the dielectric behavior between the two series of composites.

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Structure and Mechanical Properties of Polyurethane/Silica Hybrid Coatings
✍ Yongchun Chen; Shuxue Zhou; Haihua Yang; Limin Wu 📂 Article 📅 2005 🏛 John Wiley and Sons 🌐 English ⚖ 242 KB

## Abstract **Summary:** Polyurethane/silica hybrid coatings were prepared via in situ (IS) or blending (BL) method using different acidic silica sols. The effects of preparation methods, silica types, and content on the structure and mechanical properties of the hybrid coatings were investigated.