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- W2030673695 abstract "Abstract There has been some controversy recently as to whether hevea and balata (or gutta-percha) macromolecules comprise 100 per cent 1,4 units, or whether they are predominantly cis and trans structures, respectively, with minor amounts of isopropenyl or 3,4 units. Binder contends, on the basis of a small absorption peak at 11.25 µ in the infrared spectrum of each of these polymers, that the hevea and balata macromolecules contain 2.2 and 1.3 per cent 3,4 units, respectively. This has been disputed by Fraga who showed that there was no evidence for isopropenyl groups in the near infrared spectra; he therefore concluded that the natural polyisoprenes are essentially pure 1, 4-type polymers. Another interesting Question which has never been resolved is whether the 1,4 units in hevea (or balata) are exclusively cis (or trans) or whether these polymers contain a small amount of the opposite isomer as an impurity. Recent developments in high resolution n.m.r. work on polymers, and in particular, the application of n.m.r. to an analysis of butadiene—isoprene copolymer compositions, have prompted us to examine these questions with the aid of this tool. The present communication reports the results of an investigation of hevea and balata microstructure using a Varian high resolution 100 Mc. n.m.r. spectrometer as well as a Mnemotron Computer of Average Transients (C.A.T.) attached to a Varian A-60 spectrometer." @default.
- W2030673695 created "2016-06-24" @default.
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- W2030673695 date "1963-05-01" @default.
- W2030673695 modified "2023-09-28" @default.
- W2030673695 title "High Resolution Nuclear Magnetic Resonance Spectra of Various Polyisoprenes" @default.
- W2030673695 doi "https://doi.org/10.5254/1.3539559" @default.
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