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Synthesis and characterization of dextrin derivatives by heterogeneous esterification.
- Source :
- Journal of Polymer Research; Mar2018, Vol. 25 Issue 3, p0-0, 1p
- Publication Year :
- 2018
-
Abstract
- A series of fully-acylated dextrin esters (DS = 3) with varying side-chain lengths (C2-12) were synthesized by heterogeneous esterification using trifluoroacetic anhydride/carboxylic acid. The influence of side-chain lengths on structure and properties of dextrin esters were investigated by structural, thermal, mechanical and hydrophobic analysis. The thermal stability of dextrin was enhanced by esterification, presenting ca. 40-60 °C higher decomposition temperatures than that of neat-dextrin. The transition temperatures of melting and crystallization were not observed for all dextrin esters because they were amorphous polymers. The glass transition temperature (T<subscript>g</subscript>) was not observed in dextrin but was observed in dextrin esters. As increasing side-chain length, T<subscript>g</subscript>s of dextrin esters decreased ranged from 162.2 °C (C2) to 49.2 °C (C12). Colorless and transparent dextrin ester films were prepared to measure the film properties. Tensile strength of dextrin ester films tended to decrease with increasing side-chain lengths, whereas the elongation at break increased. And, dextrin ester films showed significantly increased hydrophobicity with a contact angle of up to 102° (C12). [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10229760
- Volume :
- 25
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- Journal of Polymer Research
- Publication Type :
- Academic Journal
- Accession number :
- 128379626
- Full Text :
- https://doi.org/10.1007/s10965-017-1333-1