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Advances in Materials Science and Engineering
Volume 2015, Article ID 715879, 9 pages
Research Article

Preparation and Properties of OMMT/PU Composites

1Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin 150080, China
2College of Material Science & Engineering, Harbin University of Science and Technology, Xiangfang District, Harbin, Heilongjiang 150040, China

Received 14 August 2014; Revised 2 November 2014; Accepted 7 December 2014

Academic Editor: Kwangho Kim

Copyright © 2015 Chen Yufei et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Prepolymer of polyurethane (PU) was prepared by toluene diisocyanate (TDI) and polyether diol through polymerization, organically modified montmorillonite (OMMT) gained by montmorillonite (MMT) that was modified by octadecyl trimethyl ammonium chloride (OTAC), and the OMMT was used as intercalator; alcohol-based OMMT/PU adhesive was synthesized. The micromorphology of OMMT/PU adhesives was observed by XRD, SEM, and AFM, and the shear strength, elongation at break, peel strength, and water resistance were tested and the relationship between structure and properties of the adhesives was observed and analyzed. XRD suggested that OMMT has been completely peeled in the polyurethane matrix and the spacing of layers has increased. SEM and AFM indicated that the OMMT dispersed evenly in the PU matrix and had a good transition with PU matrix, and the interface effects between two phases were strong. The results of the mechanical properties showed that OMMT could significantly help to improve properties of OMMT/PU adhesive, and the shearing strength, fracture tensile strength, and peel strength of 4 wt% OMMT/PU adhesive were 7.24 MPa, 2.14 MPa, and 451.2 N/m, respectively; the water absorption quantity was 2.82%. Compared with the unmodified PU, the shearing strength, tensile strength, and elongation at break of 4 wt% OMMT/PU adhesive were increased by 36.75%, 134.90%, and 76.80%, respectively. The peel strength decreased by 30.76%, and the water absorption decreased by 17.54%, in the meanwhile.