Switching from linear to cyclic δ-Polyvalerolactone synthesized via zeolitic imidazolate framework as a catalyst: A promising approach

Farah Naz, Bibimaryam Mousavi, Zhixiong Luo, Christia Jabbour, Philippe M. Heynderickx, Somboon Chaemchuen, Francis Verpoort

Research output: Contribution to journalArticlepeer-review

Abstract

A series of spray dried zeolitic imidazolate frameworks (ZIFs = ZIF-8, ZIF-67, and Zn/Co-ZIF) are used as a catalyst for the bulk ring-opening polymerization of δ-valerolactone without any co-catalyst to generate polyvalerolactone. Interestingly, using the same catalyst under the same reaction conditions could manipulate the structure of the product polymer, and thus its physical properties. Thus, using a dried substrate leads to the formation of the cyclic polymer while a linear polymer was formed on using the commercially available substrate. An activated monomer mechanism has been suggested where the propagating zinc alkoxide undergoes an intramolecular transesterification to release cyclic or linear polyvalerolactone. The ROP of δ-VL without drying shows that the polymeric zwitterions have little tendency to cyclize in the presence of moisture. At 140 °C, ZIF-8 shows a superior catalytic activity resulting in the production of cyclic polyvalerolactone having a high molecular weight as compared to ZIF-67 or Zn/Co-ZIF due to the presence of highly active sites. The catalyst could be recycled and reused without any significant loss of catalytic activity.

Original languageEnglish
Article numbere4890
JournalApplied Organometallic Chemistry
Volume33
Issue number5
DOIs
Publication statusPublished - 1 May 2019

Keywords

  • biodegradable polymer
  • heterogeneous catalyst
  • Polyvalerolactone
  • ring opening polymerization
  • Zeolitic imidiazolate framework

ASJC Scopus subject areas

  • Chemistry(all)
  • Inorganic Chemistry

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