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dc.contributor.authorNathaporn Cheechanaen_US
dc.contributor.authorWachara Benchaphanthaweeen_US
dc.contributor.authorNatthapol Akkravijitkulen_US
dc.contributor.authorPuracheth Rithchumponen_US
dc.contributor.authorThiti Junpiromen_US
dc.contributor.authorWanich Limwanichen_US
dc.contributor.authorWinita Punyodomen_US
dc.contributor.authorNawee Kungwanen_US
dc.contributor.authorChanisorn Ngaojampaen_US
dc.contributor.authorPraput Thavornyutikarnen_US
dc.contributor.authorPuttinan Meepowpanen_US
dc.description.abstractIn this work, we successfully synthesized high thermal sTable 1,n-bis(N-(N′-butylimidazolium)alkane bishexafluorophosphates (1,n-bis[Bim][PF6], n = 4, 6, 8, and 10) catalysts in 55–70% yields from imidazole which were applied as non-toxic DILs catalysts with 1-butanol as initiator for the bulk ROP of ε-caprolactone (CL) in the varied ratio of CL/nBuOH/1,4-bis[Bim][PF6] from 200/1.0/0.25–4.0 to 700/1.0/0.25–4.0 by mol%. The result found that the optimal ratio of CL/nBuOH/1,4-bis[Bim][PF6] 400/1.0/0.5 mol% at 120◦C for 72 h led to the polymerization conversions higher than 95%, with the molecular weight (Mw) of PCL 20,130 g mol−1 (Ð~1.80). The polymerization rate of CL increased with the decreasing linker chain length of ionic liquids. Moreover, the mechanistic study was investigated by DFT using B3LYP (6–31G(d,p)) as basis set. The most plausible mechanism included the stepwise and coordination insertion in which the alkoxide insertion step is the rate-determining step.en_US
dc.subjectMaterials Scienceen_US
dc.titleOrganocatalytic ring-opening polymerization of ε-caprolactone using bis(N-(N<sup>′</sup>-butylimidazolium)alkane dicationic ionic liquids as the metal-free catalysts: Polymer synthesis, kinetics and DFT mechanistic studyen_US
article.volume13en_US University of Technology Lannaen_US Mai Universityen_US
Appears in Collections:CMUL: Journal Articles

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