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Structure and Mechanical Properties of Polyurethane/Silica Hybrid Coatings

✍ Scribed by Yongchun Chen; Shuxue Zhou; Haihua Yang; Limin Wu

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
242 KB
Volume
290
Category
Article
ISSN
1438-7492

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✦ Synopsis

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. It was found that there existed two types of silica phases in the hybrid coatings: silica‐rich agglomerate and primary silica‐rich phase, whose size and compactness depended upon the silica types and the preparation methods. Introducing silica could result in obvious changes in surface free energy, atomic composition, and mechanical properties of the hybrid coatings.

Typical SEM image of the fractured surface of hybrids obtained by the in situ method.

magnified imageTypical SEM image of the fractured surface of hybrids obtained by the in situ method.

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