title: One-pot synthesis of thermoplastic mixed paramylon esters using trifluoroacetic anhydride.
abstract: Mixed paramylon esters prepared from paramylon (a storage polysaccharide of Euglena), acetic acid, and a long-chain fatty acid by one-pot synthesis using trifluoroacetic anhydride as a promoter and solvent were shown to have thermoplasticity. Size exclusion chromatography indicated that the mixed paramylon esters had a weight average molecular weight of approximately 4.9-6.7×10(5). Thermal analysis showed that these esters were stable in terms of the glass transition temperature (>90°C) and 5% weight loss temperature (>320°C). The degree of substitution of the long alkyl chain group, a dominant factor determining thermoplasticity, was controlled by tuning the feed molar ratio of acetic acid and long-chain fatty acid to paramylon. These results implied that the one-pot synthesis is useful for preparing structurally-well defined thermoplastic mixed paramylon esters with high molecular weight.
authors.affiliation: Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 6th, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan. Electronic address: moto.shibakami@aist.go.jp.
authors.forename: Motonari
authors.initials: M
authors.lastname: Shibakami
authors.affiliation: Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 6th, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan.
authors.forename: Gen
authors.initials: G
authors.lastname: Tsubouchi
authors.affiliation: Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 5th, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.
authors.forename: Mitsugu
authors.initials: M
authors.lastname: Sohma
authors.affiliation: Department of Marine Biology and Environmental Science, Faculty of Agriculture, University of Miyazaki, 1-1 Gakuen Kibanadai-nishi, Miyazaki 889-2192, Japan.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Hayashi
mesh_terms: D000089:Acetic Anhydrides / Q000737:chemistry*; D000577:Amides / Q000737:chemistry; D002152:Calorimetry, Differential Scanning; D066241:Carbon-13 Magnetic Resonance Spectroscopy; D002625:Chemistry, Organic / Q000379:methods*; D004952:Esters / Q000138:chemical synthesis* / Q000737:chemistry; D005240:Feasibility Studies; D005463:Fluoroacetates / Q000737:chemistry*; D005936:Glucans / Q000138:chemical synthesis* / Q000737:chemistry; D018021:Lithium Chloride / Q000737:chemistry; D008970:Molecular Weight; D019814:Myristic Acid / Q000737:chemistry; D010969:Plastics / Q000138:chemical synthesis*; D058105:Polymerization; D013696:Temperature; D013818:Thermogravimetry
chemical_list: D000089:Acetic Anhydrides; D000577:Amides; D004952:Esters; D005463:Fluoroacetates; D005936:Glucans; D010969:Plastics; D019814:Myristic Acid; C003045:paramylon; C017958:trifluoroacetic anhydride; D018021:Lithium Chloride
keywords: Esterification; Euglena; One-pot synthesis; Paramylon; Thermoplastic