| Polymers from Fatty Acids: Poly(ω-hydroxyl tetradecanoic acid) Synthesis and Physico-Mechanical Studies. | |
| | |
MedLine Citation:
|
PMID: 21793591 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
|
This paper describes the synthesis and physico-mechanical 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 catalyst in a two stage polymerization (2 h at 200 oC under N2, 4 h at 220 oC under 0.1 mmHg). Poly(ω-hydroxytetradecanoate), P(ω-OHC14), Mw, determined by SEC-MALLS, increased from 53K to 110K as the Ti(OiPr)4 concentration increased from 50 to 300 ppm. By variation of polymerization conditions (catalyst concentration, reaction time, 2nd stage reaction temperature) a series of P(ω-OHC14) samples were prepared with Mw values from 53K to 140K. The synthesized polyesters with Mw 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 Mw 53K to 78K showed a brittle-to-ductile transition. In contrast, P(ω-OHC14) with Mw 53K undergoes brittle fracture. Increasing P(ω-OHC14) Mw above 78K resulted in a strain-hardening phenomena and tough properties with elongation at break about 700% and true tensile strength about 50 MPa. Comparisons between HDPE and P(ω-OHC14) mechanical and thermal properties as a function of their respective molecular weights are discussed. |
| | |
Authors:
|
Chen Liu; Fei Liu; Jiali Cai; Wenchun Xie; Timothy E Long; S Richard Turner; Alan M Lyons; Richard A Gross |
Publication Detail:
|
Type: JOURNAL ARTICLE Date: 2011-7-28 |
Journal Detail:
|
Title: Biomacromolecules Volume: - ISSN: 1526-4602 ISO Abbreviation: - Publication Date: 2011 Jul |
Date Detail:
|
Created Date: 2011-7-28 Completed Date: - Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 100892849 Medline TA: Biomacromolecules Country: - |
Other Details:
|
Languages: ENG Pagination: - Citation Subset: - |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Isoenergetic microarrays to study the structure and interactions of DsrA and OxyS RNAs in two- and t...
Next Document: Hydrogenation of Azides over Copper Nanoparticles Surface Using Ammonium Formate in water.