The structure of natural rubber polyisoprene isomers was studied using mid infrared(MIR)spectroscopy.The effect of temperature changes on the structure of natural rubber polyiso-prene isomers was investigated using temperature dependent deconvolution MIR spectroscopy.The re-sults showed that there were four types of polyisoprene isomers in natural rubber at a temperature of 293 K,including cis-1,4-,trans-1,4-,1,2-,and 3,4-configurations.Within the range of 293 K to 393 K,with the increase of testing temperature,the absorption wave numbers and strengths correspond-ing to the four isomers of natural rubber polyisoprenehave changed to a certain extent.The transfor-mation of the trans-1,4-configuration of some natural rubber polyisoprene to cis-1,4-configuration was a key step in the structural change of the entire isomer.
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