Structure and properties of damping chlorinated butyl rubber composites with hyperbranched polyester grafted hindered phenol

The damping performance of chlorinated butyl rubber (CIIR) cannot satisfy the rigorous requirements of damping and vibration reduction. Hindered phenol can endow rubber composites with good damping performance, but these small molecules may migrate from rubber matrices. Here, a novel type of damping agent based on the hyperbranched polyester grafted hindered phenol (AG-HP102) was prepared by grafting hindered phenol (AG) with hydroxyl terminated hyperbranched polyester (HP102). It was then incorporated into chlorinated butyl rubber (CIIR) to prepare damping rubber composites. The test results showed that tan δ max of CIIR/AG-HP102 (7 phr) was 1.40, which was 32.1% higher than that of pure CIIR, 1.05. In addition, the glass transition temperature ( T g ) was increased from − 26.0 to − 16 ℃. The mechanical property tests showed that the tensile strength and elongation at break of the CIIR/AG-HP102 (7 phr) composite reached 8.21 MPa and 1192%, respectively, which was 290.9% and 39.5% higher than those of pure CIIR, 2.11 MPa and 858%. These experiment results can offer some useful information for the design and fabrication of high-performance polymeric damping materials.