摘要
Eucommia ulmoides gum（EU gum）,known as gutta percha in Southeast Asia,is a natural polymer with double characteristics of rubber and plastic.In present paper,tanδ-T curve and hysteresis loss（HL） were chosen to characterize its damping property.The results indicated that its tanδvalue would increase with rising of temperature when T0℃and form another damping peak at 40-80℃besides T_g peak.This phenomenon resulted from meltage of crystals of EU gum could increase its damping property at ambient-high temperature.Its tanδvalue even exceeded those of conventional damping rubbers,such as nitrile-butadiene rubber（NBR） and chlorinated isobutene-isoprene rubber（CIIR）.
Eucommia ulmoides gum（EU gum）,known as gutta percha in Southeast Asia,is a natural polymer with double characteristics of rubber and plastic.In present paper,tanδ-T curve and hysteresis loss（HL） were chosen to characterize its damping property.The results indicated that its tanδvalue would increase with rising of temperature when T0℃and form another damping peak at 40-80℃besides T_g peak.This phenomenon resulted from meltage of crystals of EU gum could increase its damping property at ambient-high temperature.Its tanδvalue even exceeded those of conventional damping rubbers,such as nitrile-butadiene rubber（NBR） and chlorinated isobutene-isoprene rubber（CIIR）.
