A Library of Well-Defined and Water-Soluble Poly(alkyl phosphonate)s with Adjustable Hydrolysis

Thomas Wolf, Tobias Steinbach, Frederik R. Wurm*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

55 Citations (Scopus)

Abstract

Poly(alkyl ethylene phosphonate)s with different alkyl side chains exhibit significant differences in their degradation behavior. Three novel 2-alkyl-2-oxo-1,3,2-dioxaphospholanes, cyclic monomers for the ring-opening polymerization (ROP) toward poly(alkyl alkylene phosphonate)s, were synthesized by robust two- or three-step protocols in reasonable yields and high purity. The polymerization was promoted by the organocatalysts 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) and 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) and proceeded with high control over molecular weight and narrow molecular weight distributions (A 1.2) up to full conversion. These polymers with methyl, ethyl, and isopropyl side chains are perfectly soluble in water (up to 25 mg mL-1) without a temperature-dependent phase separation. They showed no toxicity against HeLa cells after 24 h of incubation at any tested concentration. Polymers with butyl side chains exhibit decreased solubility and concentration-dependent cloud point temperatures and show toxicity against HeLa cells at concentrations above 25 mL-1. The polymers showed no acetylcholinesterase inhibition. All polymers exhibited significantly different degradation times under both neutral as well as basic conditions (variation of the alkyl side chain allowed stabilities from 8 h up to 6 days).

Original languageEnglish
Pages (from-to)3853-3863
Number of pages11
JournalMacromolecules
Volume48
Issue number12
DOIs
Publication statusPublished - 23 Jun 2015
Externally publishedYes

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