| Synthesis and characterization of branched polymers from lipase-catalyzed trimethylolpropane copolymerizations. | |
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MedLine Citation:
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PMID: 17477567 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Lipase-catalyzed terpolymerizations were performed with the monomers trimethylolpropane (B3), 1,8-octanediol (B2), and adipic acid (A2). Polymerizations were performed in bulk, at 70 degrees C, for 42 h, using immobilized lipase B from Candida antartica (Novozyme-435) as a catalyst. To determine the substitution pattern of trimethylolpropane (TMP) in copolymers, model compounds with variable degrees of acetylation were synthesized. Inverse-gated 13C NMR spectra were recorded to first determine the chemical shift positions for mono-, di-, and trisubstituted TMP units and, subsequently, to determine substitution of TMP units along chains. Variation of TMP in the monomer feed gave copolymers with degrees of branching (DB) from 20% to 67%. In one example, a hyperbranched copolyester with 53 mol % TMP adipate units was formed in 80% yield, with Mw 14 100 (relative to polystyrene standards), Mw/Mn 5.3, and DB 36%. Thermal and crystalline properties of the copolyesters were studied by thermogravimetric analysis and differential scanning calorimetry. |
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Authors:
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Ankur S Kulshrestha; Wei Gao; Hongyong Fu; Richard A Gross |
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Publication Detail:
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Type: Journal Article Date: 2007-05-04 |
Journal Detail:
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Title: Biomacromolecules Volume: 8 ISSN: 1525-7797 ISO Abbreviation: Biomacromolecules Publication Date: 2007 Jun |
Date Detail:
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Created Date: 2007-06-11 Completed Date: 2007-08-09 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 100892849 Medline TA: Biomacromolecules Country: United States |
Other Details:
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Languages: eng Pagination: 1794-801 Citation Subset: IM |
Affiliation:
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National Science Foundation Industry/University Cooperative Research Center for Biocatalysis and Bioprocessing of Macromolecules, Department of Chemical and Biological Sciences, Polytechnic University, Six Metrotech Center, Brooklyn, New York 11201, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Calorimetry, Differential Scanning Candida Catalysis Hot Temperature Lipase / chemistry* Macromolecular Substances Magnetic Resonance Spectroscopy Models, Chemical Molecular Weight Polymers / chemical synthesis*, chemistry* Propylene Glycols / chemistry* Temperature Thermogravimetry Time Factors |
| Chemical | |
Reg. No./Substance:
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0/Macromolecular Substances; 0/Polymers; 0/Propylene Glycols; 77-99-6/trimethylolpropane; EC 3.1.1.-/Novozyme 435; EC 3.1.1.3/Lipase |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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