Polymer-supported metal catalysts for the heterogeneous polymerisation of lactones

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

A series of metal complexes were immobilised onto an inert poly(styrene) (PS) support and utilised in the solvent free ring-opening polymerisation (ROP) of various lactones. PS-LHZnOAc, PS-LHSnOct and PS-LClSnOct were identified as the most successful heterogeneous catalysts for the ROP of l-lactide. Investigations by in situ ATR-FT-IR revealed conversions reaching ca. 90% in 6, 2.3 hours and 55 minutes, respectively, with excellent molecular weight control and dispersities (M 1.15-1.17). Catalyst loadings as low as 15 ppm metal and TOF values of up to 810 h-1 could also be achieved. Higher molecular weights could be targeted (ca. 35 kDa) whilst maintaining low dispersities in comparison to the industrial standard. Catalyst reuse was also possible, with up to 7 reuse cycles, albeit accompanied by a progressive reduction in conversion. Energy-Dispersive X-ray (EDX) spectroscopy and Inductively Coupled Plasma-Optical Emission Spectrometry (ICP-OES) showed low metal content in the unpurified polymer (as low as 335 ppm, similar to what is found in polymer purified by classical methods), suggesting these systems as promising reusable catalysts for the industrial production of metal-free renewable polymers.

Original languageEnglish
Pages (from-to)5894-5904
Number of pages11
JournalPolymer Chemistry
Volume10
Issue number43
Early online date22 Oct 2019
DOIs
Publication statusPublished - 21 Nov 2019

ASJC Scopus subject areas

  • Bioengineering
  • Biochemistry
  • Polymers and Plastics
  • Organic Chemistry

Fingerprint Dive into the research topics of 'Polymer-supported metal catalysts for the heterogeneous polymerisation of lactones'. Together they form a unique fingerprint.

Cite this