Damping mechanism and different modes of molecular motion through the glass transition of chlorinated butyl rubber and petroleum resin blends

To further investigate the effect of petroleum resin on damping mechanism and different modes of motion of chlorinated butyl rubber (CIIR), two kinds of petroleum resins with different molecular structures, aliphatic C5 resin and aromatic C9 resin, were incorporated into CIIR. The experimental results showed that the aliphatic C5 resin exhibited a better miscibility with CIIR, compared with aromatic C9 resin. With increase in the content of the C5 resin, the α process and the α′ process of CIIR moved to the higher temperature but to different extents, and the effective damping temperature range was broadened remarkably. The CIIR/C9 resin blends showed two loss peaks, which corresponded to the CIIR matrix and the C9 resin dispersed phase, respectively. The C9 resin neither moved different relaxation modes of CIIR to room temperature nor enhanced the value of the loss damping peak. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40464.