Melt Derived Blocky Copolyesters: New Design Features for Polycondensation

Melt polycondensation was utilized to chain extend polytrimethylene terephthalate with 1,3-propanediol based fluorinated isophthalic oligomers, resulting in copolymers with retained microstructure. Our findings point toward the formation of a blocky type copolymer. In general, formation of block or...

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Bibliographic Details
Published inMacromolecules Vol. 45; no. 20; pp. 8245 - 8256
Main Authors Drysdale, Neville E, Brun, Yefim, McCord, Elizabeth F, Nederberg, Fredrik
Format Journal Article
LanguageEnglish
Published Washington, DC American Chemical Society 23.10.2012
Subjects
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Polycondensation
Preparation, kinetics, thermodynamics, mechanism and catalysts
Fluorine containing copolymer
Molecular structure
Segmented polymer
Alkyl terephthalate copolymer
Alkyl terephthalate polymer
Contact angle
Transesterification
Experimental study
Lateral group
Isophthalate copolymer
Ester copolymer
Multiblock copolymer
Preparation
Surface properties
Copolycondensation
Hydrophobic group
Microstructure
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Summary:Melt polycondensation was utilized to chain extend polytrimethylene terephthalate with 1,3-propanediol based fluorinated isophthalic oligomers, resulting in copolymers with retained microstructure. Our findings point toward the formation of a blocky type copolymer. In general, formation of block or segmented copolymers from melt derived polycondensation is a very challenging task due to the propensity for adverse randomization reactions. Supported by size exclusion chromatography, our copolymers are fully chain extended, with no presence of the initial components. Furthermore, thermal differential scanning calorimetry has confirmed that the melt characteristics of the starting components are retained. In addition, interaction polymer chromatography and sequence distribution analysis using 13C NMR supports a blocky backbone microstructure. Seemingly, intermolecular chain end condensation occurs, whereas transesterification is dormant. While these findings open up new doors for polymer/materials development, we are particularly interested in these structures as melt additives to address oil repellency of polyester blends. When used in blends these blocky additives show an improvement in oil repellency compared with random additives of identical molar composition, i.e., they are more fluorine efficient.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma3011075