Photoinitiated cationic polymerization; a study to the polymerization and molecular mobility of polyepoxide networks using phosphorescence spectroscopy

E.W. Meijer, R.J.M. Zwiers

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    Abstract

    The rate of network formation in the polymn. and crosslinking of 1-epoxyethyl-3,4-epoxycyclohexane, 1,4-butanediol diglycidyl ether, 3,4-epoxycyclohexylmethyl-3',4'-epoxy cyclohexane carboxylate, and cyclohexene oxide in the presence of di(4-tert-butylphenyl) iodonium hexafluoroarsenate photoinitiator was characterized by the increase in the intensity of fluorescence (lmax = 340 nm) and phosphorescence (lmax = 480) emissions. The half life of the triplet excited state was const. during polymn. which indicated that the increase in crosslink d. proceeded via an inhomogeneous pathway. The phosphorescence intensity and half life of all epoxy networks showed a discontinuity in their Arrhenius plots at .apprx.260 K due to the onset of quenching of the triplet excited state. The activation energy above the transition temp. was an indication of the increase in chain mobility with increasing temp. Dynamic thermomech. anal. of the networks established a correlation between the mech. properties and chain mobility.
    Original languageEnglish
    Title of host publicationCrosslinked epoxies : proceedings of the 9th discussion conference [of the 1986 Prague Meetings on Macromolecules], Prague, Czechoslovakia, July 14-17, 1986
    EditorsB. Sedlacek, J. Kahovec
    Place of PublicationBerlin
    PublisherWalter de Gruyter GmbH
    Pages27-40
    ISBN (Print)3-11-010824-0
    Publication statusPublished - 1987

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