Damping properties of chlorinated polyethylene‐based hybrids: Effect of organic additives

In this article, the damping properties of organic hybrids consisting of chlorinated polyethylene (CPE), N,N‐dicyclohexyl‐2‐benzothia‐zolylsufenamide (DZ), and 4,4′‐thio‐bis(3‐methyl‐6‐tert‐butylphenol) (BPSR) have been investigated by dynamic mechanical analysis (DMA). It is found that DZ and BPSR seem to have a synergistic effect on the damping improvement of CPE/DZ/BPSR hybrids. For CPE/DZ/BPSR three‐component hybrids, when BPSR content is below 20 wt %, the values of damping peak maximum are just the same, while the damping peak position shifts to a higher temperature at a higher BPSR concentration. When BPSR content is fixed at 10 wt %, the damping peak maximum increases with increasing DZ/CPE ratio, while there is little shift in the peak position within the ratio range of 0.75–1.25. The decrease in damping peak maximum against annealing can be attributed to the phase separation resulting from the crystallization of hybrids components. Such a crystalline phase, which has been formed during annealing, contains not only pure DZ crystallites but also some CPE–DZ or CPE–DZ–BPSR eutectic crystals. Furthermore, the damping stability of the hybrids can be improved excellently by adding a small amount of BPSR or changing hot‐pressing temperature. These may imply that a series of high‐performance damping materials possessing both high damping peak maximum and controllable damping peak position can be achieved.