Moisture-curing kinetics of isocyanate prepolymer adhesives

Benjamin S. Lepene; Timothy E. Long; Andrew Meyer; David E. Kranbuehl

doi:10.1080/00218460210934

Moisture-curing kinetics of isocyanate prepolymer adhesives

Benjamin S. Lepene, Timothy E. Long, Andrew Meyer, David E. Kranbuehl

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

4 Scopus citations

Abstract

The reaction between isocyanate-terminated prepolymers and atmospheric moisture produces urea linkages and results in a hydrogen-bonded network of linear high molecular weight polymers with adhesive properties. This study describes the synthesis of isocyanate-terminated prepolymers and investigates the use of in situ infrared spectroscopy as a technique for monitoring the chemistry of the polymerization reaction kinetics. In situ FTIR was successfully used as a means to monitor the residual isocyanate levels and the extent of the polymerization reaction. Frequency dependent dielectric sensing (FDEMS) using a thin, planar sensor has been used to monitor the reaction kinetics by monitoring changes in the mobility of ions in the reacting medium. A direct correlation of the extent of prepolymer cure was found using the normalized FTIR isocyanate absorbance spectrum and FDEMS imaginary permittivity at 500 Hz for the duration of the cure cycle. The results of this investigation demonstrate that FDEMS is an effective online method to monitor the extent of moisture cure in the bulk as well as in a coating or adhesive bondline.

Original language	English (US)
Pages (from-to)	297-312
Number of pages	16
Journal	Journal of Adhesion
Volume	78
Issue number	4
DOIs	https://doi.org/10.1080/00218460210934
State	Published - 2002
Externally published	Yes

Keywords

Cure monitoring
Frequency dependent dielectric sensing (FDEMS)
Isocyanate
Moisture cure adhesives

ASJC Scopus subject areas

Chemistry(all)
Mechanics of Materials
Surfaces and Interfaces
Surfaces, Coatings and Films
Materials Chemistry

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10.1080/00218460210934

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title = "Moisture-curing kinetics of isocyanate prepolymer adhesives",

abstract = "The reaction between isocyanate-terminated prepolymers and atmospheric moisture produces urea linkages and results in a hydrogen-bonded network of linear high molecular weight polymers with adhesive properties. This study describes the synthesis of isocyanate-terminated prepolymers and investigates the use of in situ infrared spectroscopy as a technique for monitoring the chemistry of the polymerization reaction kinetics. In situ FTIR was successfully used as a means to monitor the residual isocyanate levels and the extent of the polymerization reaction. Frequency dependent dielectric sensing (FDEMS) using a thin, planar sensor has been used to monitor the reaction kinetics by monitoring changes in the mobility of ions in the reacting medium. A direct correlation of the extent of prepolymer cure was found using the normalized FTIR isocyanate absorbance spectrum and FDEMS imaginary permittivity at 500 Hz for the duration of the cure cycle. The results of this investigation demonstrate that FDEMS is an effective online method to monitor the extent of moisture cure in the bulk as well as in a coating or adhesive bondline.",

keywords = "Cure monitoring, Frequency dependent dielectric sensing (FDEMS), Isocyanate, Moisture cure adhesives",

author = "Lepene, {Benjamin S.} and Long, {Timothy E.} and Andrew Meyer and Kranbuehl, {David E.}",

note = "Funding Information: The authors would like to thank H. B. Fuller Company for funding and technical discussions related to this project, Dow Chemical for poly(propylene glycol) and MDI, and Air Products for the tin catalyst. The National Science Foundation CRIF (Division of Chemistry) program is gratefully acknowledged for providing funding for the in situ FTIR spectrometer, and the ACS Petroleum Research Fund as administered by the American Chemical Society for research funding.",

year = "2002",

doi = "10.1080/00218460210934",

language = "English (US)",

volume = "78",

pages = "297--312",

journal = "Journal of Adhesion",

issn = "0021-8464",

publisher = "Taylor and Francis Ltd.",

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TY - JOUR

T1 - Moisture-curing kinetics of isocyanate prepolymer adhesives

AU - Lepene, Benjamin S.

AU - Long, Timothy E.

AU - Meyer, Andrew

AU - Kranbuehl, David E.

N1 - Funding Information: The authors would like to thank H. B. Fuller Company for funding and technical discussions related to this project, Dow Chemical for poly(propylene glycol) and MDI, and Air Products for the tin catalyst. The National Science Foundation CRIF (Division of Chemistry) program is gratefully acknowledged for providing funding for the in situ FTIR spectrometer, and the ACS Petroleum Research Fund as administered by the American Chemical Society for research funding.

PY - 2002

Y1 - 2002

N2 - The reaction between isocyanate-terminated prepolymers and atmospheric moisture produces urea linkages and results in a hydrogen-bonded network of linear high molecular weight polymers with adhesive properties. This study describes the synthesis of isocyanate-terminated prepolymers and investigates the use of in situ infrared spectroscopy as a technique for monitoring the chemistry of the polymerization reaction kinetics. In situ FTIR was successfully used as a means to monitor the residual isocyanate levels and the extent of the polymerization reaction. Frequency dependent dielectric sensing (FDEMS) using a thin, planar sensor has been used to monitor the reaction kinetics by monitoring changes in the mobility of ions in the reacting medium. A direct correlation of the extent of prepolymer cure was found using the normalized FTIR isocyanate absorbance spectrum and FDEMS imaginary permittivity at 500 Hz for the duration of the cure cycle. The results of this investigation demonstrate that FDEMS is an effective online method to monitor the extent of moisture cure in the bulk as well as in a coating or adhesive bondline.

AB - The reaction between isocyanate-terminated prepolymers and atmospheric moisture produces urea linkages and results in a hydrogen-bonded network of linear high molecular weight polymers with adhesive properties. This study describes the synthesis of isocyanate-terminated prepolymers and investigates the use of in situ infrared spectroscopy as a technique for monitoring the chemistry of the polymerization reaction kinetics. In situ FTIR was successfully used as a means to monitor the residual isocyanate levels and the extent of the polymerization reaction. Frequency dependent dielectric sensing (FDEMS) using a thin, planar sensor has been used to monitor the reaction kinetics by monitoring changes in the mobility of ions in the reacting medium. A direct correlation of the extent of prepolymer cure was found using the normalized FTIR isocyanate absorbance spectrum and FDEMS imaginary permittivity at 500 Hz for the duration of the cure cycle. The results of this investigation demonstrate that FDEMS is an effective online method to monitor the extent of moisture cure in the bulk as well as in a coating or adhesive bondline.

KW - Cure monitoring

KW - Frequency dependent dielectric sensing (FDEMS)

KW - Isocyanate

KW - Moisture cure adhesives

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Moisture-curing kinetics of isocyanate prepolymer adhesives

Abstract

Keywords

ASJC Scopus subject areas

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