A hard twist: A helical poly(phenylacetylene) with L- or D-alanine pendants with a long alkyl chain showed an unprecedented change in the main-chain stiffness accompanied by inversion of the helical sense of the polymer, resulting from the “on and off” fashion of the intramolecular hydrogen-bonding networks in polar and nonpolar solvents.
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Okoshi et al. (2006) studied this question.
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