Green and selective polycondensation methods toward linear sorbitol-based polyesters: enzymatic versus organic and metal-based catalysis

L. Gustini, C. Lavilla, W.T.J. Janssen, A. Martinez de Ilarduya, S. Muñoz-Guerra, C.E. Koning

Research output: Contribution to journalArticleAcademicpeer-review

15 Citations (Scopus)
16 Downloads (Pure)

Abstract

Renewable polyesters derived from a sugar alcohol (i.e., sorbitol) were synthesized by solvent-free polycondensation. The aim was to prepare linear polyesters with pendant hydroxyl groups along the polymer backbone. The performance of the sustainable biocatalyst SPRIN liposorb CALB [an immobilized form of Candida antarctica lipase B (CALB); SPRIN technologies] and the organo-base catalyst 1,5,7-triazabicyclo[4,4,0]dec-5-ene (TBD) were compared with two metal-based catalysts: dibutyl tin oxide (DBTO) and scandium trifluoromethanesulfonate [also known as scandium triflate, Sc(OTf)3]. For the four catalytic systems, the efficiency and selectivity for the incorporation of sorbitol were studied, mainly using 13C and 31P NMR spectroscopies, whereas side reactions, such as ether formation and dehydration of sorbitol, were evaluated using MALDI-TOF-MS. Especially the biocatalyst SPRIN liposorb CALB succeeded in incorporating sorbitol in a selective way without side reactions, leading to close-to-linear polyesters. By using a renewable hydroxyl-reactive curing agent based on l-lysine, transparent and glossy poly(ester urethane) networks were successfully synthesized offering a tangible example of bio-based coatings.

Original languageEnglish
Pages (from-to)2250-2260
Number of pages11
JournalChemSusChem
Volume9
Issue number16
DOIs
Publication statusPublished - 2016

Keywords

  • biocatalysis
  • carbohydrates
  • polymerization
  • renewable resources
  • sustainable chemistry

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