Alkyne Polymerization

Sanda, Fumio; Shiotsuki, Masashi; Masuda, Toshio

doi:10.1016/b978-0-444-53349-4.00088-1

Cited by 14 publications

(20 citation statements)

References 550 publications

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“…(in the case of asymmetric monomers (e.g., isoprene), 3,4-substructure is also possible) [11,12]. Stereoregular polymers of butadiene are depicted as follows: cis-1,4-, trans-1,4-, it-1,2-, and st-1,2-polymers (Fig.…”

Section: Dienes and Acetylenesmentioning

confidence: 98%

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Stereospecific Polymerization

Hirano

Kitaura

2014

Encyclopedia of Polymeric Nanomaterials

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Section: Dienes and Acetylenesmentioning

confidence: 98%

“…Rhodium complexes such as 13 and 14 ( Fig. 22) are effective for the polymerization of substituted acetylenes such as phenylacetylene to form cis-transoidal polymers [12]. …”

Section: Dienes and Acetylenesmentioning

confidence: 99%

Stereospecific Polymerization

Hirano

Kitaura

2014

Encyclopedia of Polymeric Nanomaterials

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“…According to wideangle X-ray scattering (WAXS) analyses, the yellow and red colored polymers have pseudohexagonal columnar crystal structures composed of stretched cis-transoidal and contracted cis-cisoidal helices, respectively. The Rh-catalyzed polymerization of 2-ethynylnaphthalene using ethanol or toluene as solvent affords yellow-and red-colored polymers (6), which possess broad absorptions at 445 and 510 nm, respectively. 19 The former polymer is composed of a stretched cis-transoidal helix, while the latter a contracted cis-cisoidal helix according to WAXS.…”

Section: Solvent-responsive Substituted Pasmentioning

confidence: 99%

“…On the other hand, substituted polyacetylenes (PAs) have been investigated with respect to various aspects such as precision synthesis, helical structures, and a variety of optoelectronic functions on the basis of their features as typical conjugated polymers. [5][6][7][8][9] Especially, poly(phenylacetylene)s (PPAs) have been studied in detail taking advantage of its generality and usefulness. Motivated by helical biomacromolecules, artificial helical polymers have also made remarkable progress during the last few decades.…”

Section: Introductionmentioning

confidence: 99%

Stimuli-Responsive Polyacetylenes and Dendronized Poly(phenylacetylene)s

Masuda

Zhang

2016

Polymer Reviews

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Combination of stimuli responsiveness with p-conjugated polymers possesses probabilities not only to provide these polymers with unique interesting properties but also to promote new functions including various optoelectronic properties, catalysis, ionic sensing, and chiral recognition. In the former part of this review, recent developments of stimuli-responsive polyacetylenes are surveyed, which act as receptors towards external stimuli such as solvent, temperature, pH, chiral compounds, metal cations, various anions, electricity, light, etc., to transduce to other signals or energies, which leads to a wide range of intriguing properties to mimic biological processes or applications to smart or intelligent materials. In the latter part, we introduce dendronized poly(phenylacetylene)s (PPAs) exhibiting interesting thermoresponsive and chiroptical properties. Thermoresponsiveness of these dendronized conjugated polymers shows synchronous influence on their helical and hydrated conformations.

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“…As a category of typical conjugated polymers, polyacetylene and its derivatives have been extensively studied because of their interesting physical and chemical properties. [2][3][4][5] Substituted polyacetylenes can form helical structures with a predominantly one-handed screw sense by the introduction of appropriate chiral substituents into the side chain or helix-sense-selective polymerization of achiral monomers. [6][7][8][9] Such polymers are of great interest for potential applications as functional materials in molecular recognition, 10 asymmetric catalysis, 11 and chemical sensors 12 based on their electronic and optical properties, which are derived from their conjugated main chain and secondary structures.…”

Section: Introductionmentioning

confidence: 99%

Helical poly(phenylacetylene)s containing schiff-base and amino groups: Synthesis, secondary structures, and responsiveness to benzoic acid

Gao

Zhao

Yue

et al. 2013

J. Polym. Sci. Part A: Polym. Chem.

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Novel acetylenic monomers containing Schiff-base and amino groups, (S)-N-(4-ethynylbenzylidene)-1-phenylethan-, and (R)-N-(4-ethynylbenzyl)-1-phenylethanamine (1e) were synthesized and polymerized with [(nbd)RhCl] 2 /Et 3 N catalyst to afford the corresponding polymers 2a-e with moderate molecular weights (M n 5 9000-60,000) in high yields (85-97%). All the polymers were soluble in common organic solvents including toluene, CHCl 3 , CH 2 Cl 2 , THF, and DMF. Large optical rotations and strong CD signals demonstrated that 2a, 2b, 2d, and 2e take helical structures with a predominantly one-handed screw sense. The effects of solvents and temperature revealed that these polymers took dynamic helical structure based on the steric effect of side groups. The CD patterns of 2d and 2e containing free amino moieties were completely inverted by the addition of benzoic acid. Upon further addition of NaOH, the CD pattern returned to the original one, indicating the reversible conformational change of these polymers according to pH.

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Alkyne Polymerization

Cited by 14 publications

References 550 publications

Stereospecific Polymerization

Stereospecific Polymerization

Stimuli-Responsive Polyacetylenes and Dendronized Poly(phenylacetylene)s

Helical poly(phenylacetylene)s containing schiff-base and amino groups: Synthesis, secondary structures, and responsiveness to benzoic acid

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