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Publication Cover
Journal of Macromolecular Science, Part A
Pure and Applied Chemistry
Volume 51, 2014 - Issue 4
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Original Articles

Ring Opening Polymerization of Lactide in a Monomode Microwave using Stannous Octoate and Dibutyltin Dimethoxide Catalysts

Pankil Singla School of Chemistry and Biochemistry, Thapar University, Patiala-147004, Punjab, India
,
Rajeev Mehta Department of Chemical Engineering, Thapar University, Patiala-147004, Punjab, India
,
Dusan Berek Polymer Institute of the Slovak Academy of Sciences, 84541, Bratislava, Slovakia
&
Siddh N. Upadhyay DAE-Raja Ramanna Emeritus Fellow, Department of Chemical Engineering and Technology, Indian Institute of Technology (Banaras Hindu University) Varanasi, Varanasi, 221005, UP, India
Pages 350-361 | Received 01 Oct 2013, Accepted 01 Nov 2013, Published online: 05 Mar 2014
 
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Abstract

The ring-opening polymerization of L-lactide to poly(lactic acid), PLA was carried out under N2 atmosphere and microwave irradiation using stannous octoate (SnOct2) and dibutyltin dimethoxide (DBTM) as initiators. The polymerization rate was much faster than that obtained with conventional heating. The polymer was characterized by Heteronuclear Single Quantum Coherence Spectroscopy (1H and 13C-HSQC NMR), Fourier Transform Infrared Spectroscopy (FTIR) and Size Exclusion Chromatography (SEC). The poly(styrene)-equivalent weight-average molar mass (M w ) obtained with SnOct2 was 1.02 × 105 g mol−1, while in the case of DBTM, it was only 4.0 × 104 g mol−1 and the corresponding polydispersities varied from 1.2 to 2.4 and 1.6 to 1.8, respectively. A significant degradation of PLA in chloroform solvent was observed for the first time.

Acknowledgment

The experimental assistance of Ms E. Macová is acknowledged.

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