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Abstract

The thermal reactivity of a set of different blocked perfluoropolyether (PFPE) containing polyisocyanates and one monocomponent polyurethane containing a PFPE diol was investigated by Fourier transform infrared (FT-IR) spectroscopy. With the former series of products the deblocking kinetics at 90 °C and 120 °C were investigated with time-dependent spectral data, showing the highest thermal deblocking activity for 3,5 dimethylpyrazole blocking agent. The crosslinking reaction of the PFPE diol with ketoxime blocked isocyanurate at 150 °C was monitored by infrared (IR) spectroscopy and two-dimensional (2D) correlation analysis; the results suggested a prevailing direct condensation mechanism and the formation of urea byproducts in the later stages of reaction. Both synchronous and asynchronous spectra were considered and discussed, pointing out the time relation of the chemical functions during the crosslinking experiment.

Keywords

Crosslinking mechanism Polyurethane Infrared spectroscopy

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References

Ortel

, Polyurethane Handbook (Hanser, Munich, 1985), p. 83.

Wicks

D. W.

and Wicks

Z. W

, Prof. Org. Coat. 36, 148 (1999).

Peterson

, Liebig's Ann. Chem. 562, 205 (1945).

Muhlebach

, J. Polym. Sci. A 32, 753 (1994).

Carlson

G. M.

Neag

C. M.

Kuo

and Provder

, “Cure Kinetics characterization of blocked isocyanate coatings by FT-IR and thermal-mechanical analysis”, in Advances in Urethane Science and Technology, Frisch

K. C.

and Klempner

, Eds. (Technomic, Lancaster, PA, 1984), p. 47.

Turri

Scicchitano

Marchetti

Sanguineti

and Radice

, “Structure-Property Relationships in Coatings Based on Perfluoropolyether Macromers”, in Fluoropolymers 2: Properties, Hougham

Cassidy

P. E.

Johns

and Davidson

, Eds. (Kluwer Academic, New York, 1999), p. 145.

Noda

Dowrey

A. E.

and Marcott

, “Two-Dimensional Infrared (2D IR) Spectroscopy”, in Modern Polymer Spectroscopy, Zerbi

Ed. (John Wiley and Sons, New York, 1999), pp. 1–32.

Gianotti

Levi

and Turri

, J. Appl. Polym. Sci. 51, 973 (1994).

Turri

Radice

Canteri

Speranza

and Anderle

, Surf. Interface Anal. 29, 873 (2000).

10.

Pacansky

Miller

Hatton

Liu

and Scheiner

, J. Am. Chem. Soc. 113, 329 (1991).

11.

Thames

S. F.

and Boyer

P. C

, J. Coat. Technol. 62, 51 (1990).

12.

Noda

, Bull. Am. Phys. Soc. 31, 520 (1986).

13.

Noda

, Appl. Spectrosc. 47, 1329 (1993).

14.

Palmer

R. A.

Chao

J. L.

Dittmar

R. M.

Gregoriou

V. G.

and Plunkett

, Appl. Spectrosc. 47, 1297 (1993).

15.

Nakano

Shimada

Saitoa

and Noda

, Appl. Spectrosc. 47, 1337 (1993).

16.

Ozaki

Liu

and Noda

, Macromolecules 30, 2391 (1997).

17.

Ebihara

Takahashi

and Noda

, Appl. Spectrosc. 47, 1343 (1993).

18.

and Siesler

H. W

, J. Mol. Struct. 521, 37 (2000).

19.

Noda

Dowrey

A. E.

and Marcott

, Appl. Spectrosc. 47, 1317 (1993).

Fourier Transform Infrared Studies on Deblocking and Crosslinking Mechanisms of Some Fluorine Containing Monocomponent Polyurethanes

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