The Homopolymerization of Monoisocyanates

Shashoua, Victor E.

doi:10.1021/ja01521a072

Cited by 106 publications

(46 citation statements)

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“…Among anionic initiators for the polymerization of vinyl monomers, initiators such as sodium benzophenone ketyl, butyllithium, and alkali metal naphthalenide (M-Naph) have been reported. [8] Considering both reactivity of the monomers and solubility of the initiators, M-Naph in THF was found to be a good initiating system for the copolymerization of HIC with St at low temperature.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Well‐Defined Rod‐Coil‐Rod Polyhexylisocyanate‐block‐polystyrene‐block‐polyhexylisocyanate via One‐Pot Anionic Polymerization

Ahn

Lee

2003

Macromol. Rapid Commun.

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A rod‐coil‐rod block copolymer, polyhexylisocyanate‐block‐polystyrene‐block‐polyhexylisocyanate, of controlled molecular weight was synthesized quantitatively via living anionic polymerization using potassium naphthalenide in the presence of sodium tetraphenylborate. The use of K+ as the counterion for the polymerization of styrene, and Na+ (NaBPh4) for the polymerization of isocyanate leads to the formation of a well‐controlled novel triblock copolymer. magnified image

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Section: Resultsmentioning

confidence: 99%

Synthesis of Well‐Defined Rod‐Coil‐Rod Polyhexylisocyanate‐block‐polystyrene‐block‐polyhexylisocyanate via One‐Pot Anionic Polymerization

Ahn

Lee

2003

Macromol. Rapid Commun.

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“…Polyisocyanate is a synthetic polymer that has a rigid main chain based on the structure of 1 -nylon [275,276] . Although no asymmetric carbon center is contained in the main chain, polyisocyanate can be optically active since it possesses a dynamic helical conformation [277,278] .…”

Section: Polymerization Of Isocyanatesmentioning

confidence: 99%

Asymmetric Polymerization

Ito¹,

Nozaki²

2010

Catalytic Asymmetric Synthesis

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“…Hence they have been studied for application as chiral recognition materials, optical switches and liquid crystal materials [1][2][3][4][5] . Usually, the polymerizations of isocyanates were carried out by anionic initiators such as NaCN, sodium naphthalene , and lithium amide of piperidine at very low temperatures (−78-98℃) [6][7][8][9] . Novak et al established the coordination polymerization of alkyl isocyanates by organotitanium (Ⅵ) catalysts.…”

Section: Introductionmentioning

confidence: 99%

Room temperature polymerization of alkyl isocyanates catalyzed by rare earth Schiff base complexes

Yang

Shen

2009

Sci. China Ser. B-Chem.

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The polymerization of alkyl isocyanates catalyzed by rare earth chloride salen complexes/triisobutyl aluminum (Ln(H 2 salen) 2 Cl 3 ·2C 2 H 7 OH/Al(i-Bu) 3 ) at room temperature was investigated. The influences of ligand structure, catalyst composition, polymerization temperature, polymerization time, the concentration of catalyst and monomer, and the polymerization solvent on the polymerization of isocyanates were studied. It was found that under the polymerization conditions, examined La(H 2 salen A ) 2 Cl 3 ·2C 2 -H 7 OH/Al(i-Bu) 3 (H 2 salen A = N,N'-disalicylideneethylene diamine) is a fairly high efficient catalyst for the polymerization of n-hexyl isocyanate (n-HexNCO) to prepare high molecular weight poly(n-hexyl isocyanate) (PHNCO) with narrower molecular weight distribution at room temperature. PHNCO could be prepared with yield of 74.0%, number-average molecular weight (M n ) of 40.20×10 4 and MWD of 1.79 under the following optimum conditions: [Al]/[La] = 30 (molar ratio), [n-HexNCO]/[La] = 100 (molar ratio), [n-HexNCO] = 3.43 mol/L polymerization at 20℃ for 12 h in toluene.In the same polymerization conditions, poly (n-octyl isocyanate) (PONCO) with yield of 67.3%, and poly(n-butyl isocyanate) (PBNCO) with yield of 45.5%, could be prepared respectively. The kinetics of the polymerization of n-HexNCO was also investigated and found to be first-order with respect to both monomer and catalyst concentrations.rare earth catalyst, Schiff base complex, polymerization, alkyl isocyanate

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The Homopolymerization of Monoisocyanates

Cited by 106 publications

References 0 publications

Synthesis of Well‐Defined Rod‐Coil‐Rod Polyhexylisocyanate‐block‐polystyrene‐block‐polyhexylisocyanate via One‐Pot Anionic Polymerization

Synthesis of Well‐Defined Rod‐Coil‐Rod Polyhexylisocyanate‐block‐polystyrene‐block‐polyhexylisocyanate via One‐Pot Anionic Polymerization

Asymmetric Polymerization

Room temperature polymerization of alkyl isocyanates catalyzed by rare earth Schiff base complexes

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