Mid Infrared Spectroscopy Study on Structure of Natural Rubber Polyisoprene Isomers
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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