International Journal of Polymer Science / 2013 / Article / Tab 2

Research Article

Fourier Transform Infrared Spectral Analysis of Polyisoprene of a Different Microstructure

Table 2

The explanation of absorption peaks of FTIR spectrum of polyisoprene.

Wavenumber/cm−1AttributionWavenumber/cm−1Attribution

3080–C–H stretching vibration of carbon-carbon double bond in 1,2-unit
1150Stretching vibration of CC main chain in trans-1,4-unit
3070CH2 stretching vibration of –C=C– in 3,4-unit 1140Stretching vibration of CC main chain in cis-1,4-unit
3035CH stretching vibration of –C=C– in 1,4- or 1,2-unit 1044Stretching or wagging vibration of CH3C=C in trans-1,4-unit
2727Sympathetic vibration1036Stretching or wagging vibration of CH3C=C in cis-1,4-unit
1663C=C stretching vibration of 1,4-unit1003Stretching vibration of C–C in 3,4-unit
1644C=C stretching vibration of 3,4- or 1,2-unit910Out-of-plane bending vibration of CH2 in the –CH=CH2 (1,2-unit)
1413Bending vibration of C–H in the =CH2 group of 3,4- or 1,2-unit 888Out-of-plane bending vibration of CH2 in the –C=CH2 (3,4-unit)
1383Scissoring vibration of CH3 in trans-1,4-unit843Out-of-plane bending vibration of C–H in the –CH=CH– group of trans-1,4-unit
1375Scissoring vibration of CH3 in cis-1,4-, 3,4- and 1,2-units837Out-of-plane bending vibration of C–H in the –CH=CH– group of cis-1,4-unit
1325Scissoring vibration of CH3 or CH in trans-1,4-unit 600Torsion or twisting vibration of CCC group in trans-1,4-unit
1311Scissoring vibration of CH3 or CH in cis-1,4-unit

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