Polymers from fatty acids: Poly(ω-hydroxyl tetradecanoic acid) synthesis and physico-mechanical studies

Chen Liu, Fei Liu, Jiali Cai, Wenchun Xie, Timothy Edward Long, S. Richard Turner, Alan Lyons, Richard A. Gross

Research output: Contribution to journalArticle

78 Citations (Scopus)

Abstract

This Article describes the synthesis and physicomechanical properties of bioplastics prepared from methyl ω-hydroxytetradecanoic acid (Me-ω-OHC14), a new monomer available by a fermentation process using an engineered Candida tropicalis strain. Melt-condensation experiments were conducted using titanium tetraisopropoxide (Ti[OiPr] 4) as a catalyst in a two-stage polymerization (2 h at 200 °C under N 2, 4 h at 220 °C under 0.1 mmHg). Poly(ω-hydroxytetradecanoate), P(ω-OHC14), M w, determined by SEC-MALLS, increased from 53K to 110K as the Ti(OiPr) 4 concentration increased from 50 to 300 ppm. By varying the polymerization conditions (catalyst concentration, reaction time, second-stage reaction temperature) a series of P(ω-OHC14) samples were prepared with M w values from 53K to 140K. The synthesized polyesters with M w ranging from 53K to 140K were subjected to characterization by DSC, TGA, DMTA, and tensile testing. Influences of P(ω-OHC14) molecular weight, melting point, and enthalpies of melting/crystallization on material tensile properties were explored. Cold-drawing tensile tests at room temperature for P(ω-OHC14) with M w 53K-78K showed a brittle-to-ductile transition. In contrast, P(ω-OHC14) with M w 53K undergoes brittle fracture. Increasing P(ω-OHC14) M w above 78K resulted in a strain-hardening phenomena and tough properties with elongation at break ∼700% and true tensile strength of ∼50 MPa. Comparisons between high density polyethylene and P(ω-OHC14) mechanical and thermal properties as a function of their respective molecular weights are discussed.

Original languageEnglish
Pages (from-to)3291-3298
Number of pages8
JournalBiomacromolecules
Volume12
Issue number9
DOIs
Publication statusPublished - 2011 Sep 12
Externally publishedYes

ASJC Scopus subject areas

  • Bioengineering
  • Biomaterials
  • Polymers and Plastics
  • Materials Chemistry

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