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Characterisation of Blends Based on Hydroxyethylcellulose and Maleic Acid‐ alt ‐Methyl Vinyl Ether
Author(s) -
Khutoryanskaya Olga V.,
Khutoryanskiy Vitaliy V.,
Pethrick Richard A.
Publication year - 2005
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200500069
Subject(s) - materials science , maleic acid , polymer chemistry , miscibility , vinyl alcohol , chemical engineering , maleic anhydride , dielectric , differential scanning calorimetry , dynamic mechanical analysis , dielectric spectroscopy , ether , aqueous solution , vinyl ether , polymer , chemistry , composite material , organic chemistry , copolymer , physics , optoelectronics , electrode , electrochemistry , engineering , thermodynamics
Summary: Hydrophilic polymeric films based on blends of hydroxyethylcellulose and maleic acid‐ co ‐methyl vinyl ether were produced by casting from aqueous solutions. The physicochemical properties of the blends have been assessed using Fourier transform infrared spectroscopy, thermal gravimetric analysis, differential scanning calorimetry, dielectric spectroscopy, etc. The pristine films exhibit complete miscibility due to the formation of intermacromolecular hydrogen bonding. The thermal treatment of the blend films leads to cross‐linking via intermacromolecular esterification and anhydride formation. The cross‐linked materials are able to swell in water and their swelling degree can be easily controlled by temperature and thermal treatment time. The formation of the crosslinks is apparent in the dynamic properties of the blends as observed through the mechanical relaxation and dielectric relaxation spectra. The dielectric characteristics of the material are influenced by the effects of change in the local structure of the blend on the ionic conduction processes and the rate of dipolar relaxation. Separation of these processes is attempted using the dielectric modulus method. Significant deviations from a simple additive rule of mixing on the activation energy are observed consistent with hydrogen bonding and crosslinking of the matrix. This paper indicates a method for the creation of films with good mechanical and physical characteristics by exposing the blends to a relatively mild thermal treatment.Scheme of hydrogen bonding between hydroxyethylcellulose and maleic acid‐ co ‐methyl vinyl ether.