Abstract
A pair of diblock copolymers, poly(isoprene-block-2-vinylpyridine) (IP) and poly(styrene-block-(4-tert-butoxystyrene)) (StB) were successfully prepared by controlled anionic polymerizations. StB diblock copolymer was treated with HCl and hence poly(4-tert-butoxystyrene) can be converted into poly(4-hydroxylstyrene) (H) by an acid hydrolysis reaction, where conversion yield was 98%, so that poly(styrene-block-4-hydroxystyrene) (SH) was produced quantitatively. I/P and S/H volume ratios were both designed to be 9/1. From the comparison of IR spectra of three IP/SH blends with composition ratio of 25/75, 50/50 and 75/25 at the bulk film state, the formation of hydrogen bonding between a hydroxyl group on H and a nitrogen atom on P was confirmed, whose magnitude reaches to a maximum when IP/SH blend ratio is about 50/50 by weight. From morphological observation using transmission electron microscopy (TEM), macrophase-separated structure was observed for IP/StB=50/50 blend, while simple lamellar microphase-separated structure was observed for IP/SH=50/50 blend due to hydrogen bonding interaction.
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Asari, T., Matsuo, S., Takano, A. et al. Preparation and Characterization of Diblock Copolymers of the AB and CD Types and their Self-Assembled Structure by Hydrogen Bonding Interaction. Polym J 38, 258–263 (2006). https://doi.org/10.1295/polymj.38.258
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DOI: https://doi.org/10.1295/polymj.38.258
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