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


Paper Type 
 Contributed Paper
Title 
 Tin(II) n-Hexoxide as New Initiator for the Ring-Opening Polymerization of ε-Caprolactone: Isoconversional Kinetics Analysis by Non-Isothermal DSC
Author 
 Boontharika Thapsukhon*, Wanich Limwanich, Puttinan Meepowpan and Winita Punyodom
Email 
 boontharika.th@up.ac.th
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 (Ea) with monomer
conversion was successfully investigated by Kissinger-Akahira-Sunose (KAS) isoconversional method.
The values of Ea 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 ( Mn ) 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.
Start & End Page 
 276 - 291
Received Date 
 2020-09-17
Revised Date 
Accepted Date 
 2021-01-12
Full Text 
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Keyword 
 kinetics, DSC, ε-caprolactone, ring-opening polymerization, Tin(II) hexoxide
Volume 
 Vol.48 No.2 (March 2021)
DOI 
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.
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