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Characterization of konjac glucomannan–quaternized poly(4‐vinyl‐ N ‐butyl) pyridine blend films and their preservation effect
Author(s) -
Liu Changhua,
Xiao Chaobo
Publication year - 2004
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.20646
Subject(s) - thermogravimetric analysis , materials science , glucomannan , ultimate tensile strength , differential scanning calorimetry , thermal stability , scanning electron microscope , aqueous solution , polymer chemistry , polymer , chemical engineering , nuclear chemistry , composite material , chemistry , organic chemistry , biochemistry , physics , engineering , thermodynamics
Novel polymer blends were prepared from a mixture of 2 wt % konjac glucomannan and 4 wt % quaternized poly(4‐vinyl‐ N ‐butyl) pyridine (QPVP) in aqueous solution and dried at room temperature for 72 h. Their structure and properties were studied by infrared, wide‐angle X‐ray diffraction, scanning electron microscopy, thermogravimetric analysis, and differential scanning calorimetry. Thermal stability in the dry state was reduced with increasing content of QPVP. Compared with QPVP film, the tensile strength of the films was improved in the dry state. The maximum value of 12.74% tensile break elongation was reached when the content of QPVP was 30%. Structural analysis indicated that clear phase separation was observed when the content of QPVP was only 50%. Results from the filmcoating preservation experiments with lychee showed that this blend film had water‐holding ability. The fruit weight loss rate and rot rate both decreased in various degrees. The potential uses of these novel polymer films could be as preservative films. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 1868–1875, 2004