✍ Scribed by Jianping Deng; Jianmin Wang; Weiguo Zhao; Zhigang Zhang; Wantai Yang
No coin nor oath required. For personal study only.
This paper deals with synthesis and characterization of a novel poly(N‐propargylamide) containing cinnamamide groups (poly(1)) in its side chains. Monomer 1, CHCCH~2~NHCOCHCH(C~6~H~5~), was synthesized and polymerized with a rhodium catalyst, (nbd)Rh^+^B^−^(C~6~H~5~)~4~ (nbd = 2,5‐norbornadiene). Effects of some factors on polymerization of monomer 1 such as solvent, temperature, and the ratio of monomer/catalyst were investigated in detail; polymers with moderate number‐average molecular weights ($\overline M _{\rm n}$) and low index of polydispersity ($\overline M _{\rm w} /\overline M _{\rm n}$) were obtained. To improve the polymers' solubility and to elucidate whether poly(1) could form helical conformation, another N‐propargylamide monomer 2, CHCCH~2~NHCOCH(CH~2~CH~3~)~2~, was employed to accomplish copolymerization with monomer 1. Copolymerization with monomer 2 improved obviously the solubility of the (co)polymers; the copolymers with certain monomer ratios could form helices under the examined conditions according to the related UV‐vis spectra.
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