title: Preparation and characterization of novel optically active poly(vinyl alcohol-co-vinyl ester) in nonaqueous medium using L-phenylalanine as a chiral material.
abstract: In this investigation, poly(vinyl alcohol) was chemically modified by the introduction of different amounts of N-phthaloyl-L-phenylalanine. The modification was carried out by the reaction of PVA hydroxyl groups with (2S)-3-phenyl-2-phthalimidylpropanoyl chloride using N,N-dimethyl acetamide/lithium chloride as a reaction media. The novel copolymers obtained were characterized by spectroscopic techniques, elemental analysis, X-ray diffraction and thermal methods. Optical rotation and viscosities were also measured. The degree of esterification was determined by (1)H-NMR. The influence of reagent molar ratio on the degree of modification was also evaluated. The vinyl(3-phenyl-2-phthalimidopropanoate) content in the copolymer was attained up to 52%. Thermal stability of the copolymers was checked by thermogravimetric analysis and differential thermogravimetric analysis. All copolymers displayed improved thermal stability compared to the parent polymer.
authors.affiliation: Organic Polymer Chemistry Research Laboratory, Department of Chemistry, Isfahan University of Technology, 84156-83111, Esfahān, Islamic Republic of Iran. mallak@cc.iut.ac.ir
authors.forename: Shadpour
authors.initials: S
authors.lastname: Mallakpour
authors.forename: Abdolvahid
authors.initials: A
authors.lastname: Barati
mesh_terms: D015394:Molecular Structure; D010649:Phenylalanine / Q000737:chemistry*; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry; D011142:Polyvinyl Alcohol / Q000737:chemistry*; D014753:Vinyl Compounds / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D011108:Polymers; D014753:Vinyl Compounds; C100195:vinyl ether; D010649:Phenylalanine; D011142:Polyvinyl Alcohol