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Structure and Mechanical Properties of Polyurethane/Silica Hybrid Coatings
Author(s) -
Chen Yongchun,
Zhou Shuxue,
Yang Haihua,
Wu Limin
Publication year - 2005
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.200500169
Subject(s) - materials science , polyurethane , agglomerate , hybrid material , composite material , in situ , surface energy , phase (matter) , nanotechnology , chemistry , organic chemistry , physics , meteorology
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.