NQR study of the structure and structural transitions of chloroprene rubbers |
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| Authors: | T.A. Babushkina L.N. Gvozdeva G.K. Semin |
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| Affiliation: | Institute of Organo-Element Compounds, Academy of Sciences of the USSR, Vavilova 28, MoscowU.S.S.R. |
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| Abstract: | The microstructures of some chloroprene rubbers, chloroprene-styrene copolymer and chloroprene-dichlorobutadiene copolymer, have been examined by nuclear quadrupole resonance (NQR). Molecular motions in the chloroprene rubber “nairit NP” have also been studied by NQR. It is shown that above 150 K the temperature-dependence of NQR frequencies differs for oriented and non-oriented samples. Molecular motions during unfreezing processes in the temperature range of polymer brittleness are manifested in NQR spectra by decrease of the frequency temperature coefficient. |
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