Tin(II) n-Hexoxide as New Initiator for the Ring-Opening Polymerization of ε-Caprolactone: Isoconversional Kinetics Analysis by Non-Isothermal DSC

Boontharika Thapsukhon*, Wanich Limwanich, Puttinan Meepowpan and Winita Punyodom
* Author for corresponding; e-mail address: boontharika.th@up.ac.th
Volume: Vol.48 No.2 (March 2021)
Research Article
DOI:
Received: 17 September 2020, Revised: -, Accepted: 12 January 2021, Published: -

Citation: Thapsukhon B., Limwanich W., Meepowpan P. and Punyodom W., Tin(II) n-Hexoxide as New Initiator for the Ring-Opening Polymerization of ε-Caprolactone: Isoconversional Kinetics Analysis by Non-Isothermal DSC, Chiang Mai Journal of Science, 2021; 48(2): 276-291.

Abstract

The kinetics of ring-opening polymerization (ROP) of ε-caprolactone (ε-CL) initiated by 1.5 mol% of tin(II) n-hexoxide (Sn(OnHex)₂) and tin(II) octoate/n-hexanol (Sn(Oct)₂/n-HexOH) were effectively investigated by non-isothermal DSC technique. The DSC polymerization exotherms shifted to higher temperature range as heating rates increased. The polymerization rate increased with increasing heating rate for all initiating systems. The variation of activation energy (E_a) with monomer conversion was successfully investigated by Kissinger-Akahira-Sunose (KAS) isoconversional method. The values of E_a for the ROP of ε-CL with Sn(OnHex)₂ and Sn(Oct)₂/n-HexOH were 66.02±0.60 and 64.94±0.27 kJ/mol, respectively. From kinetics analysis, the reactivity of Sn(Oct)₂/n-HexOH was slightly higher than Sn(OnHex)₂ under identical condition. The catalytic performance of both initiating systems in the synthesis of poly(ε-caprolactone) (PCL) was investigated by bulk polymerization at temperatures of 140, 160 and 180 ^oC. The synthesized Sn(OnHex)₂ could produce higher number average molecular weight ( M_n ) at 140 and 160 ^oC than Sn(Oct)₂/n-HexOH. The %yield values of all synthesized PCLs were higher than 70.2%. The synthesized Sn(OnHex)₂ acted as effective initiator that could produce high molecular weight PCL in a short period of time.

Keywords: kinetics, DSC, ε-caprolactone, ring-opening polymerization, Tin(II) hexoxide

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