International Journal of Polymer Science / 2013 / Article / Tab 3

Research Article

Fourier Transform Infrared Spectral Analysis of Polyisoprene of a Different Microstructure

Table 3

The change of peaks of FTIR spectra according to the microstructure contents of polyisoprene.

Explanationpeak valueSpectrum ASpectrum BSpectrum CNote

Microstructure content
 3,4-unit%524673,4-unit% increase by progressively
 1,2-unit%523151,2-unit% increase by degrees
 1,4-unit%9053181,4-unit% decrease by degrees
Dissymmetry stretching vibration of –CH32962.1252964.0532965.982Blue shift of peak (the value is 2978 cm−1 in trans-1,4-unit)
C=C stretching vibration1644.9821644.0181643.054Red shift of peak
Scissoring vibration of CH31376.9251374.9971374.033Red shift of peak (the value is 1383 cm−1 in trans-1,4-unit)
Out-of-plane bending vibration of CH2 in the –C=CH2 (3,4-unit)889.023888.059887.095Red shift of peak
Out-of-plane bending vibration of C–H in the –CH=CH– group of 1,4-unit836.955840.812848.849
(flat top)
blue shift of peak

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