Preparation and characterization of hyperbranched polymer modified montmorillonite/chlorinated butyl rubber damping composites

In this work, Na+-montmorillonite (MMT) was modified by hyperbranched polymer (HBP) and grafted with hindered phenol to improve the damping and other properties of the chlorinated butyl rubber (CIIR) composites. The hyperbranched polymer-modified montmorillonite (HBP-OMMT) was prepared by organic montmorillonite (OMMT) that was obtained from the cation exchange reaction between MMT and silane quaternary ammonium salt. The main characterization methods were Fourier transform infrared spectroscopy, hydrogen nuclear magnetic resonance, X-ray diffraction, scanning electron microscopy, energy dispersive spectrometer, and thermogravimetric (TG) analysis. The basal spacings of MMT, OMMT, and HBP-OMMT were 1.47, 2.94, and 4.09 nm, respectively. The onset and center temperatures of decomposition (T-5% and T-max) of HBP-OMMT were improved from 301 and 369 degrees C to 332 and 398 degrees C, respectively. The CIIR damping composites were prepared by mechanical blending of HBPOMMT with pure CIIR. The tensile strength and elongation at break of the composites were improved from 5.4 MPa and 890% to 7.6 MPa and 1066%. From TG curves, T-5% and T-max were increased from 297.4 and 406.0 degrees C to 323.3 and 410.5 degrees C, respectively. The dynamic mechanical analysis results showed that tan delta rose from the original 1.20 to 1.44 with the addition of HBP-OMMT. (C) 2016 Wiley Periodicals, Inc.