Synthesis and Characterization of Hyperbranched Polyurethanes Prepared from Blocked Isocyanate Monomers by Step-Growth Polymerization

Ralph Spindler; Jean M.J. Fréchet

doi:10.1021/ma00070a013

Synthesis and Characterization of Hyperbranched Polyurethanes Prepared from Blocked Isocyanate Monomers by Step-Growth Polymerization

Ralph Spindler, Jean M.J. Fréchet^*

^*Corresponding author for this work

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

174 Scopus citations

Abstract

The step-growth polymerization of the AB₂ blocked isocyanate monomr 3,5-bis((benzoxycarbonyl)imino)benzyl alcohol at a monomer concentration of 1 M results in the formation of a hyperbranched Polyurethane with M_w = 34 000. When the monomer concentration is increased to 2 M, a cross-linked polymer forms through the occurrence of a small amount of side reactions involving free isocyanate intermediates. Soluble polymers can be prepared, independent of the monomer concentration, when an end-capping alcohol is added at the start of the polymerization. The end-capping groups change the physical properties of the polymers such as T_g and solubility.

Original language	English (US)
Pages (from-to)	4809-4813
Number of pages	5
Journal	Macromolecules
Volume	26
Issue number	18
DOIs	https://doi.org/10.1021/ma00070a013
State	Published - 1993
Externally published	Yes

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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title = "Synthesis and Characterization of Hyperbranched Polyurethanes Prepared from Blocked Isocyanate Monomers by Step-Growth Polymerization",

abstract = "The step-growth polymerization of the AB2 blocked isocyanate monomr 3,5-bis((benzoxycarbonyl)imino)benzyl alcohol at a monomer concentration of 1 M results in the formation of a hyperbranched Polyurethane with Mw = 34 000. When the monomer concentration is increased to 2 M, a cross-linked polymer forms through the occurrence of a small amount of side reactions involving free isocyanate intermediates. Soluble polymers can be prepared, independent of the monomer concentration, when an end-capping alcohol is added at the start of the polymerization. The end-capping groups change the physical properties of the polymers such as Tg and solubility.",

author = "Ralph Spindler and Fr{\'e}chet, {Jean M.J.}",

year = "1993",

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T1 - Synthesis and Characterization of Hyperbranched Polyurethanes Prepared from Blocked Isocyanate Monomers by Step-Growth Polymerization

AU - Spindler, Ralph

AU - Fréchet, Jean M.J.

PY - 1993

Y1 - 1993

N2 - The step-growth polymerization of the AB2 blocked isocyanate monomr 3,5-bis((benzoxycarbonyl)imino)benzyl alcohol at a monomer concentration of 1 M results in the formation of a hyperbranched Polyurethane with Mw = 34 000. When the monomer concentration is increased to 2 M, a cross-linked polymer forms through the occurrence of a small amount of side reactions involving free isocyanate intermediates. Soluble polymers can be prepared, independent of the monomer concentration, when an end-capping alcohol is added at the start of the polymerization. The end-capping groups change the physical properties of the polymers such as Tg and solubility.

AB - The step-growth polymerization of the AB2 blocked isocyanate monomr 3,5-bis((benzoxycarbonyl)imino)benzyl alcohol at a monomer concentration of 1 M results in the formation of a hyperbranched Polyurethane with Mw = 34 000. When the monomer concentration is increased to 2 M, a cross-linked polymer forms through the occurrence of a small amount of side reactions involving free isocyanate intermediates. Soluble polymers can be prepared, independent of the monomer concentration, when an end-capping alcohol is added at the start of the polymerization. The end-capping groups change the physical properties of the polymers such as Tg and solubility.

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U2 - 10.1021/ma00070a013

DO - 10.1021/ma00070a013

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JF - Macromolecules

IS - 18

ER -

Synthesis and Characterization of Hyperbranched Polyurethanes Prepared from Blocked Isocyanate Monomers by Step-Growth Polymerization

Abstract

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