"Evolution of structure and properties of natural rubber for vibration damping products during storage"

Abstract

The evolution of structure and properties of natural rubber (NR) for vibration damping products during storage was studied by long-term storage method and accelerated aging method. The results showed that the hardness, modulus at 100%, modulus at 300%, storage modulus and loss modulus of NR vulcanizates increased gradually with increase of aging temperature and aging time, and the overall change trend was similar to that of crosslinking density. The change rates of tensile strength and elongation at break decreased while the loss factor decreased rapidly and tended to be stable. The ratio of dynamic stiffness and static stiffness decreased first and then increased slowly. Hot air aging had little effect on the vibration reduction performance of NR vulcanizates.

Keywords

• natural rubber， air spring， thermal- oxidative aging， crosslinking density， hardness， dynamic mechanical property， ratio of dynamic stiffness and static stiffness，