Synthesis and Preparation of Carboxylic-Acid-Type Waterborne Polyurethane Modified with Nano-Cellulose Whiskers

doi:10.19491/j.issn.1001-9278.2019.02.014

Abstract

Abstract: The vegetable oil-based waterborne polyurethane (WPU) was synthesized by using castor oil, 2-2-bis(hydroxymethyl)propionic acid and isophorone diisocyanate polyurethane as raw materials (IPDI) and then was mixed with nano-cellulose whiskers (CNC) by acid hydrolysis under ultrasonication. The coating films of WPU/CNC composite were prepared through strong hydrogen bonding between the CNC filler and WPU matrix. The microstructure, morphology and properties of the coating films were investigated by Fourier-transform infrared spectroscopy, scanning electron microscopy, particle-size analysis, thermogravimetric analysis, differential scanning calorimetry and mechanical measurements. The results indicated that the coating films achieved good dispersibility and excellent performance when 0.25 wt% of CNC was added. The tensile strength of the composites was improved from 17.56 MPa to 27.96 MPa. Moreover, the thermal stability of coating films, the decomposition temperature of hard segment and the glass transition temperature of soft segment were also improved.

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