Block copolymers derived from azobiscyanopentanoic acid. V. Block copolymerization initiated with a polyethylene glycol containing scissile azo linkages in its main chain

Ueda, Atsushi; Nagai, Susumu

doi:10.1002/pola.1987.080251229

Cited by 10 publications

(2 citation statements)

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“…When 2‐pyrrolidone was polymerized with an initiator containing an azo group, the resulting polyamide 4 containing an azo group (azo‐PA4) was a radical producer and an initiator for the PA4‐ block ‐polyvinyl monomer (Scheme ). Over the last few decades, numerous investigations have been carried out on azo macromolecular initiators synthesized by polycondensation or polyaddition 12–22. Two types of synthetic pathways can be used to synthesize block copolymers: vinyl polymerization followed by ring‐opening polymerization and vice versa.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of an azo macromolecular initiator composed of polyamide 4 and its initiation activity for the radical polymerization of vinyl monomers

Kawasaki

Yamano

Takeda

et al. 2012

J of Applied Polymer Sci

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Polyamide 4 containing an azo group (azo-PA4) was synthesized by the ring-opening polymerization of 2-pyrrolidone when 4,4 0 -azobiscyanopentanoyl chloride was used as an initiator. It was possible to control the molecular weight (MW) of the azo-PA4s through the concentration of the initiator to some extent, and the highest weight-average MW obtained was 35 Â 10 3 . To assess the initiation activity of the azo-PA4 for radical polymerization, styrene (St) was used as a vinyl monomer. The azo-PA4 was found to initiate the radical polymerization of St to produce polymers. Analyses by FT-IR spectroscopy, 1 H-NMR, and differential scanning calorimetry after the homopolymers [polyamide 4 (PA4) and polystyrene (PSt)] were removed by Soxhlet extraction showed that the remaining polymer was PA4-block-PSt. Azo-PA4 was also found to have an initiation activity for other vinyl monomers (methyl methacrylate, vinyl acetate, etc.). V C 2012 Wiley Periodicals, Inc. J Appl Polym Sci 126: E425-E432, 2012

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Section: Introductionmentioning

confidence: 99%

Synthesis of an azo macromolecular initiator composed of polyamide 4 and its initiation activity for the radical polymerization of vinyl monomers

Kawasaki

Yamano

Takeda

et al. 2012

J of Applied Polymer Sci

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“…The use of polymeric initiators such as macroazoinitiators (MAI) carrying labile azo functional groups is a well‐known route to block copolymers via conventional radical polymerization. These block copolymers have the potential to exhibit a wide variety of new physical or chemical characteristics depending on the nature of the polymer segments chosen 1–7. The synthesis via MAI provides some advantages.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of polydimethylsiloxane‐block‐polystyrene‐block‐polydimethylsiloxane via polysiloxane‐based macroinitiator in supercritical CO₂

Akgün

Deniz

Baran

et al. 2004

Polymer International

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Polydimethylsiloxane-block-polystyrene-block-polydimethylsiloxane (PDMS-b-PS-b-PDMS)was synthesized by the radical polymerization of styrene using a polydimethylsiloxane-based macroazoinitiator (PDMS MAI) in supercritical CO 2 . PDMS MAI was synthesized by reacting hydroxyterminated PDMS and 4,4 -azobis(4-cyanopentanoyl chloride) (ACPC) having a thermodegradable azo-linkage at room temperature. The polymerization of styrene initiated by PDMS MAI was investigated in a batch system using supercritical CO 2 as the reaction medium. PDMS MAI was found to behave as a polyazoinitiator for radical block copolymerization of styrene, but not as a surfactant. The response surface methodology was used to design the experiments. The parameters used were pressure, temperature, PDMS MAI concentration and reaction time. These parameters were investigated at three levels (−1, 0 and 1). The dependent variable was taken as the polymerization yield of styrene. PDMS MAI and PDMS-b-PSb-PDMS copolymers obtained were characterized by proton nuclear magnetic resonance and infrared spectroscopy. The number-and weight-average molecular weights of block copolymers were determined by gel permeation chromatography.

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Synthesis of macroazoinitiator by direct polycondensation for block copolymerization of styrene and butadiene

Simon

Bajpai²

2001

J of Applied Polymer Sci

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Macroazoinitiator (MAI) was prepared from hydroxy-terminated polybutadiene (HTPB) and 4,4Ј-azobis-4-cyanopentanoic acid (ACPA) by direct polycondensation in the presence of 1-methyl-2-chloropyridinium iodide (MCPI) at room temperature. This MAI proved to be an effective initiator for thermal polymerization of styrene at 60°C. The resulting products were characterized by viscosity measurements and both IR and NMR spectral studies. The ratio of styrene and butadiene units was calculated from NMR spectral data and scanning electron micrography.

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Block copolymers derived from azobiscyanopentanoic acid. V. Block copolymerization initiated with a polyethylene glycol containing scissile azo linkages in its main chain

Cited by 10 publications

References 8 publications

Synthesis of an azo macromolecular initiator composed of polyamide 4 and its initiation activity for the radical polymerization of vinyl monomers

Synthesis of an azo macromolecular initiator composed of polyamide 4 and its initiation activity for the radical polymerization of vinyl monomers

Synthesis of polydimethylsiloxane‐block‐polystyrene‐block‐polydimethylsiloxane via polysiloxane‐based macroinitiator in supercritical CO₂

Synthesis of macroazoinitiator by direct polycondensation for block copolymerization of styrene and butadiene

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Block copolymers derived from azobiscyanopentanoic acid. V. Block copolymerization initiated with a polyethylene glycol containing scissile azo linkages in its main chain

Cited by 10 publications

References 8 publications

Synthesis of an azo macromolecular initiator composed of polyamide 4 and its initiation activity for the radical polymerization of vinyl monomers

Synthesis of an azo macromolecular initiator composed of polyamide 4 and its initiation activity for the radical polymerization of vinyl monomers

Synthesis of polydimethylsiloxane‐block‐polystyrene‐block‐polydimethylsiloxane via polysiloxane‐based macroinitiator in supercritical CO2

Synthesis of macroazoinitiator by direct polycondensation for block copolymerization of styrene and butadiene

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Synthesis of polydimethylsiloxane‐block‐polystyrene‐block‐polydimethylsiloxane via polysiloxane‐based macroinitiator in supercritical CO₂