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Characterization of the Crosslinking Kinetics of a Thin Polymeric Layer by Real‐Time Dielectric Relaxation Spectroscopy
Author(s) -
Schönhals Andreas,
Fritz Andreas,
Pfeiffer Karl
Publication year - 2001
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 - 10.1002/1521-3935(20011101)202:16<3228::aid-macp3228>3.0.co;2-q
Subject(s) - activation energy , dielectric , relaxation (psychology) , prepolymer , glass transition , polymer chemistry , dielectric spectroscopy , spectroscopy , kinetics , chemistry , analytical chemistry (journal) , materials science , polymer , organic chemistry , psychology , social psychology , physics , optoelectronics , electrode , electrochemistry , quantum mechanics , polyurethane
Abstract The crosslinking kinetic of a thin polymeric layer based on a prepolymer of a phthalic aciddiallylester was studied by real‐time dielectric spectroscopy in the frequency range from 10 –1 to 10 5 Hz. With increasing reaction time the real part of the dielectric function ε ′ decreases. The time dependence of ε ′ can be described by a stretched exponential function with a stretching exponent of 0.5. This means that the influence of the chemical reaction on ε ′ cannot be described by a first order kinetic. From the temperature dependence of the characteristic time constant an activation energy of 71 kJ/mol could be estimated for the reaction. From the dielectric loss data the change of the relaxation rate of the dynamic glass transition f pα with the reaction time is obtained. After a temperature dependent induction period f pα decreases very strongly. No plateau value which corresponds to a glass transition in the crosslinked system is obtained for long reaction times.