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Vol. 26 No. 23 (2014)

Copyright (c) 2014 Yong Huang1, Tao Zhou1, Junhong Liu2, Aimin Zhang1

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This work is licensed under a Creative Commons Attribution 4.0 International License.

Analysis on Structural Changes of Poly(vinyl acetate) by Two-Dimensional Correlation Infrared Spectroscopy

https://doi.org/10.14233/ajchem.2014.16731
Yong Huang1
1State Key Laboratory of Polymer Materials Engineering of China, Polymer Research Institute, Sichuan University, Chengdu 610065, P.R. China 2Sichuan Chemical and Technology School, Luzhou 646005, Sichuan Province, P.R. China *Corresponding authors: Fax: +86 28 85402465; Tel: +86 28 85405868; E-mail: zhoutaopoly@scu.edu.cn; amzhang215@vip.sina.com
Tao Zhou1
1State Key Laboratory of Polymer Materials Engineering of China, Polymer Research Institute, Sichuan University, Chengdu 610065, P.R. China 2Sichuan Chemical and Technology School, Luzhou 646005, Sichuan Province, P.R. China *Corresponding authors: Fax: +86 28 85402465; Tel: +86 28 85405868; E-mail: zhoutaopoly@scu.edu.cn; amzhang215@vip.sina.com
Junhong Liu2
1State Key Laboratory of Polymer Materials Engineering of China, Polymer Research Institute, Sichuan University, Chengdu 610065, P.R. China 2Sichuan Chemical and Technology School, Luzhou 646005, Sichuan Province, P.R. China *Corresponding authors: Fax: +86 28 85402465; Tel: +86 28 85405868; E-mail: zhoutaopoly@scu.edu.cn; amzhang215@vip.sina.com
Aimin Zhang1
1State Key Laboratory of Polymer Materials Engineering of China, Polymer Research Institute, Sichuan University, Chengdu 610065, P.R. China 2Sichuan Chemical and Technology School, Luzhou 646005, Sichuan Province, P.R. China *Corresponding authors: Fax: +86 28 85402465; Tel: +86 28 85405868; E-mail: zhoutaopoly@scu.edu.cn; amzhang215@vip.sina.com

Corresponding Author(s) : Yong Huang1

Asian Journal of Chemistry, Vol. 26 No. 23 (2014)

Abstract

Poly(vinyl acetate) (PVAc) was investigated using generalized two-dimensional infrared (2D IR) correlation spectroscopy and moving-window two-dimensional spectroscopy (MW2D) with temperature raising from 10 to 200 ºC. The glass transition of poly(vinyl acetate) determined by MW2D measurement is 52 ºC. Four types of C=O stretching modes in different phase were clearly detected by asynchronous spectrum as poly(vinyl acetate) transfers from solid phase to liquid phase. The bands at 1762 cm-1 arise from free bonded C=O groups in liquid phase and 1753 cm-1 attributes to the free or non-interaction C=O groups in solid phase. The bands at 1733 and 1724 cm-1 attribute to the C=O groups involved in the C=O and OH interactions in liquid phase and solid phase, respectively. The sequential order of bands changes is also discussed. In addition, seven bands are identified at 3020, 2990, 2980, 2972, 2957, 2903 and 2851 cm-1 by 2D correlation spectra. The bands at 2990, 2980 and 2972 cm-1 are assigned to CH2 groups. The bands at 2957, 2851 cm-1 and 2903 cm-1 attribute to O-CH3 (ester group) asymmetric stretching, symmetric stretching and CH asymmetric stretching vibrations, respectively. With the temperature increasing, CH3 or CH group responds firstly and then CH2 group, after that HC=CH group follows, which denotes the side chain takes place prior to major chain.

Keywords

Poly(vinyl acetate) Moving-window two-dimensional correlation infrared spectroscopy 2D IR correlation spectroscopy.
Huang1, Y., Zhou1, T., Liu2, J., & Zhang1, A. (2014). Analysis on Structural Changes of Poly(vinyl acetate) by Two-Dimensional Correlation Infrared Spectroscopy. Asian Journal of Chemistry, 26(23), 7915–7920. https://doi.org/10.14233/ajchem.2014.16731
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