Anionic polymerization of n-hexyl isocyanate with monofuctional initiators. Synthesis of well-defined diblock copolymers with styrene and isoprene

Georgia Zorba; Aggelos Vazaios; Marinos Pitsikalis; Nikos Hadjichristidis

doi:10.1002/pola.20831

Anionic polymerization of n-hexyl isocyanate with monofuctional initiators. Synthesis of well-defined diblock copolymers with styrene and isoprene

Georgia Zorba, Aggelos Vazaios, Marinos Pitsikalis, Nikos Hadjichristidis^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

Abstract

Several monofunctional initiators, such as s-BuLi, 1,1-diphenyl-4- methylpentyl lithium (DPMPL), benzyl potassium (BzK), triphenylmethyl sodium (trityl sodium, TrNa) and benzyl sodium (BzNa) were tested and evaluated for the polymerization of n-hexyl isocyanate (HIC) in THF at -98°C. The polymerizations were conducted either without or with additives, such as LiBPh₄, NaBPh₄, and crown ether 18C6. The products were characterized by size exclusion chromatography (SEC), membrane osmometry (MO), and ^IH NMR spectroscopy. The best results regarding polymerization yield, molecular weight distribution, and agreement between the stoichiometric and the experimentally observed molecular weight were obtained by the initiating system BzNa/NaBPh₄ in a molar ratio 1/10. By using BzNa/NaBPh ₄ system, well-defined block copolymers of HIC with styrene or isoprene were synthesized for the first time.

Original language	English (US)
Pages (from-to)	3533-3542
Number of pages	10
Journal	Journal of Polymer Science, Part A: Polymer Chemistry
Volume	43
Issue number	16
DOIs	https://doi.org/10.1002/pola.20831
State	Published - Aug 15 2005
Externally published	Yes

Keywords

Anionic polymerization
Benzyl sodium
Block copolymers
Gel permeation chromatography
Light scattering
Polyisocyanates

ASJC Scopus subject areas

Materials Chemistry
Polymers and Plastics
Organic Chemistry

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title = "Anionic polymerization of n-hexyl isocyanate with monofuctional initiators. Synthesis of well-defined diblock copolymers with styrene and isoprene",

abstract = "Several monofunctional initiators, such as s-BuLi, 1,1-diphenyl-4- methylpentyl lithium (DPMPL), benzyl potassium (BzK), triphenylmethyl sodium (trityl sodium, TrNa) and benzyl sodium (BzNa) were tested and evaluated for the polymerization of n-hexyl isocyanate (HIC) in THF at -98°C. The polymerizations were conducted either without or with additives, such as LiBPh4, NaBPh4, and crown ether 18C6. The products were characterized by size exclusion chromatography (SEC), membrane osmometry (MO), and IH NMR spectroscopy. The best results regarding polymerization yield, molecular weight distribution, and agreement between the stoichiometric and the experimentally observed molecular weight were obtained by the initiating system BzNa/NaBPh4 in a molar ratio 1/10. By using BzNa/NaBPh 4 system, well-defined block copolymers of HIC with styrene or isoprene were synthesized for the first time.",

keywords = "Anionic polymerization, Benzyl sodium, Block copolymers, Gel permeation chromatography, Light scattering, Polyisocyanates",

author = "Georgia Zorba and Aggelos Vazaios and Marinos Pitsikalis and Nikos Hadjichristidis",

year = "2005",

month = aug,

day = "15",

doi = "10.1002/pola.20831",

language = "English (US)",

volume = "43",

pages = "3533--3542",

journal = "Journal of Polymer Science, Part A: Polymer Chemistry",

issn = "0887-624X",

publisher = "Wiley",

number = "16",

}

Anionic polymerization of n-hexyl isocyanate with monofuctional initiators. Synthesis of well-defined diblock copolymers with styrene and isoprene. / Zorba, Georgia; Vazaios, Aggelos; Pitsikalis, Marinos et al.
In: Journal of Polymer Science, Part A: Polymer Chemistry, Vol. 43, No. 16, 15.08.2005, p. 3533-3542.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Anionic polymerization of n-hexyl isocyanate with monofuctional initiators. Synthesis of well-defined diblock copolymers with styrene and isoprene

AU - Zorba, Georgia

AU - Vazaios, Aggelos

AU - Pitsikalis, Marinos

AU - Hadjichristidis, Nikos

PY - 2005/8/15

Y1 - 2005/8/15

N2 - Several monofunctional initiators, such as s-BuLi, 1,1-diphenyl-4- methylpentyl lithium (DPMPL), benzyl potassium (BzK), triphenylmethyl sodium (trityl sodium, TrNa) and benzyl sodium (BzNa) were tested and evaluated for the polymerization of n-hexyl isocyanate (HIC) in THF at -98°C. The polymerizations were conducted either without or with additives, such as LiBPh4, NaBPh4, and crown ether 18C6. The products were characterized by size exclusion chromatography (SEC), membrane osmometry (MO), and IH NMR spectroscopy. The best results regarding polymerization yield, molecular weight distribution, and agreement between the stoichiometric and the experimentally observed molecular weight were obtained by the initiating system BzNa/NaBPh4 in a molar ratio 1/10. By using BzNa/NaBPh 4 system, well-defined block copolymers of HIC with styrene or isoprene were synthesized for the first time.

AB - Several monofunctional initiators, such as s-BuLi, 1,1-diphenyl-4- methylpentyl lithium (DPMPL), benzyl potassium (BzK), triphenylmethyl sodium (trityl sodium, TrNa) and benzyl sodium (BzNa) were tested and evaluated for the polymerization of n-hexyl isocyanate (HIC) in THF at -98°C. The polymerizations were conducted either without or with additives, such as LiBPh4, NaBPh4, and crown ether 18C6. The products were characterized by size exclusion chromatography (SEC), membrane osmometry (MO), and IH NMR spectroscopy. The best results regarding polymerization yield, molecular weight distribution, and agreement between the stoichiometric and the experimentally observed molecular weight were obtained by the initiating system BzNa/NaBPh4 in a molar ratio 1/10. By using BzNa/NaBPh 4 system, well-defined block copolymers of HIC with styrene or isoprene were synthesized for the first time.

KW - Anionic polymerization

KW - Benzyl sodium

KW - Block copolymers

KW - Gel permeation chromatography

KW - Light scattering

KW - Polyisocyanates

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DO - 10.1002/pola.20831

M3 - Article

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Anionic polymerization of n-hexyl isocyanate with monofuctional initiators. Synthesis of well-defined diblock copolymers with styrene and isoprene

Abstract

Keywords

ASJC Scopus subject areas

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