Mechanical and thermal properties of waterborne polyurethane films modified by CaCO₃@TiO₂ particles with UV absorption activity

Abstract

CaCO₃@TiO₂ particles were synthesized through a direct carbonation method, which can be used as the substitutes of TiO₂ in pigments and coatings. To improve the dispersion in waterborne polyurethane(WPU) suspensions, CaCO₃@TiO₂ particles were modified by stearic acid. SEM tests of the fractured surfaces of the composites films showed that the CaCO₃@TiO₂ particles were well embedded in the WPU matrix. And the mechanical properties, thermal stability and water resistance of the composites films were improved by the introduction of CaCO₃@TiO₂ particles.

Keywords

Waterborne polyurethane / CaCO₃@TiO₂ particles / In situ polymerization

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