Use of Non‐isothermal DSC in Comparative Studies of Tin(II) Systems for the Ring‐Opening Polymerization of D‐lactide


Understanding the kinetics and mechanisms of polymerization, particularly the role of a catalyst or initiator used, allows for the manipulation and control of the fabrication of new materials by the most convenient, straightforward routes. The kinetics of the bulk ring-opening polymerization (ROP) of d-lactide, a useful monomer employed to control the properties of poly(l-lactide), have been studied herein to identify a relatively quick (1 h), controlled, yet convenient route to moderately high molecular weight poly(d-lactide). Tin(II) octoate (Sn(Oct) 2), Sn(Oct) 2/n-butanol (nBuOH) and liquid tin(II) butoxide (Sn(OnBu) 2) as initiating systems were investigated by non-isothermal differential scanning calorimetry (DSC). Isoconversional methods were employed to determine the activation energy (E a) for each reaction. The results showed that liquid Sn(OnBu) 2 was a more efficient initiator than the commonly reported initiating systems of Sn(Oct) 2 and Sn(Oct) 2/nBuOH in terms of producing higher polymerization rates and polymer molecular weights. High-molecular-weight poly(d-lactide) (1.8 × 10 5 Da) with moderate dispersity (Р= 1.3) was obtained using 0.1 mol% liquid Sn(OnBu) 2 as the initiator at 120 °C. This work describes the applications of non-isothermal DSC and isoconversional methods in comparing the effectiveness of different initiators in the bulk ROP of d-lactide for the first time.

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Divisions: College of Engineering & Physical Sciences > Aston Institute of Materials Research (AIMR)
College of Engineering & Physical Sciences > Aston Institute of Urban Technology and the Environment (ASTUTE)
College of Engineering & Physical Sciences
College of Engineering & Physical Sciences > School of Infrastructure and Sustainable Engineering > Chemical Engineering & Applied Chemistry
College of Engineering & Physical Sciences > Energy and Bioproducts Research Institute (EBRI)
College of Engineering & Physical Sciences > Aston Polymer Research Group
College of Engineering & Physical Sciences > Engineering for Health
College of Engineering & Physical Sciences > Aston Advanced Materials
Additional Information: Copyright © 2023 Society of Chemical Industry. This is the peer reviewed version of the following article: Phetsuk, S. et al (2023), Use of Non-isothermal DSC in Comparative Studies of Tin(II) Systems for the Ring-Opening Polymerization of D-lactide. Polym Int. Accepted Author Manuscript. Which has been published in final form at This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited. Funding Information: SP wishes to thank the Research Professional Development Project under the Science Achievement Scholarship of Thailand (SAST) for the provision of a PhD scholarship and also the Graduate School, Chiang Mai University. This research work was partially supported by the Center of Excellence in Materials Science and Technology, Chiang Mai University and the European Union's Horizon 2020 research and innovation program under Marie Sklodowska‐Curie grant agreement no. 871650 (MEDIPOL).
Uncontrolled Keywords: d-lactide,liquid tin(II) butoxide,non-isothermal DSC,ring-opening polymerization,Organic Chemistry,Polymers and Plastics,Materials Chemistry
Publication ISSN: 1097-0126
Last Modified: 18 Jul 2024 07:23
Date Deposited: 08 Mar 2023 13:55
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Related URLs: https://onlinel ... 10.1002/pi.6517 (Publisher URL)
http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2023-10
Published Online Date: 2023-02-25
Accepted Date: 2023-02-13
Authors: Phetsuk, Sawarot
Molloy, Robert
Topham, Paul D. (ORCID Profile 0000-0003-4152-6976)
Tighe, Brian J. (ORCID Profile 0000-0001-9601-8501)
Meepowpan, Puttinan
Limwanich, Wanich
Punyodom, Winita



Version: Accepted Version

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