Rubber(Elastomers)and Rubber Elasticity 房束2黄大学 Guangdong University of Technology >General properties of elastomers > The individual polymer chains of elastomers are held together by weak intermolecular bonding forces,which allow rapid chain slippage when a moderate pulling force is employed. Cross-links,which are introduced during yulcanization(a疏化)，permit rapid elongation of the principal sections,to a point where the chains Typical applied-force- are stretched to their elastic limit.Any additional elongation behavior of rubber elongation causes primary bond breakage.The cross-links,which are the boundaries for the principal sections,permitthe rubber to "remember"its originalshape,that is, the original orientation ofthe Sulphur bridges ee linking cis-1,4- Structure of thermo- particular chains. polyisoprene plastic elastomers 6 Rubber (Elastomers) and Rubber Elasticity ➢ General properties of elastomers ➢ The individual polymer chains of elastomers are held together by weak intermolecular bonding forces,which allow rapid chain slippage when a moderate pulling force is employed. ➢ Cross-links, which are introduced during vulcanization ( 硫 化 ), permit rapid elongation of the principal sections, to a point where the chains are stretched to their elastic limit. Any additional elongation causes primary bondbreakage. The cross-links, which are the boundaries for the principal sections, permitthe rubber to “remember” its originalshape, that is, the original orientation ofthe particularchains. Typical applied-force￾elongation behavior of rubber Sulphur bridges linking cis-1,4- polyisoprene Structure of thermo￾plastic elastomers 6