Abstract
Light and small-angle X-ray scattering measurements were taken on cyclohexane and toluene solutions of a polystyrene (PS) polymacromonomer (PM) having side chains consisting of 19 styrene residues and an n-butyl group (butyl-PS PM) at each end. The second virial coefficient, A2, of the butyl-PS PM in cyclohexane was positive in the temperature range of 15.0–34.5 °C, differing from previous results for PS PMs with benzyl ends (benzyl-PS PM) whose A2 vanished at 34.5 °C. The mean-square radius of gyration, 〈S2〉, for the butyl-PS PM in cyclohexane at 34.5 °C was much larger than that for the benzyl-PS PM with the same side-chain length, indicating large effects of the side-chain ends on intramolecular interactions, whereas the difference in 〈S2〉 between these polymers in toluene at 15.0 °C was quite small. From these data, the stiffness parameter and the excluded-volume strength were determined with the aid of theories for the wormlike chain model. The effects of the side-chain ends on these parameters are discussed according to recently developed theories.
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Acknowledgements
We thank Professor Takenao Yoshizaki of Kyoto University for valuable discussions. Small-angle X-ray scattering measurements were taken at beam line BL40B2 of the SPring-8 synchrotron facility with the approval of the Japan Synchrotron Radiation Research Institute (Proposal No. 2010A1388). This research was financially supported by a Grant-in-Aid (22550111) from the Ministry of Education, Culture, Sports and Technology, Japan.
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Kanda, H., Nakamura, Y. Effects of side-chain ends on the stiffness and excluded-volume parameters of polymacromonomers. Polym J 44, 252–256 (2012). https://doi.org/10.1038/pj.2011.132
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DOI: https://doi.org/10.1038/pj.2011.132
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