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Syntheses and characterization of various polyisobutylene-polystyrene copolymers

2. Refractive indices and UV-spectra of tri- and H-block copolymers

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Summary

The overall compositions of various polystyrene PSt polyisobutylene PIB block copolymers and blends of homopolymers have been investigated by a variety of techniques. While 1H NMR and IR spectroscopies gave reliable data, the UV/RI dual detector GPC method and static UV absorption method were found to be unsuitable for composition analysis of these block copolymers. The discrepancy in composition determination is due to strong hyperchromism exhibited by these novel block copolymers. The block copolymers showed significant absorption in the 280–350 nm range and their UV absorbances were much larger over the whole absorption region than those of blends of homopolymers with similar composition. In the absence of independent supporting data, e.g., NMR or IR spectroscopy, both the GPC method and UV spectroscopy yield unreliable high PSt content data. Hyperchromism of low molecular weight PSt-PIB block copolymers in solution may be due to a significant interpenetration of the PSt and PIB domains.

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Author notes

  1. Tian Ru Fang (Visiting Scientist)

    Present address: Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, The People's Republic of China

Authors and Affiliations

  1. Institute of Polymer Science, The University of Akron, 44325, Akron, OH, USA

    Tian Ru Fang (Visiting Scientist) & Joseph P. Kennedy

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  1. Tian Ru Fang
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  2. Joseph P. Kennedy
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Fang, T.R., Kennedy, J.P. Syntheses and characterization of various polyisobutylene-polystyrene copolymers. Polymer Bulletin 10, 90–97 (1983). https://doi.org/10.1007/BF00263244

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  • DOI: https://doi.org/10.1007/BF00263244

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