Depth Profiling of Photooxidized Styrene-Isoprene Copolymers by Photoacoustic and Micro-Fourier Transform Infrared Spectroscopy

Abstract

Transmission micro-FT-IR (Fourier transform infrared) and photoacoustic (PAS) FT-IR analysis have been combined to determine the oxidation profiles of various photooxidized polyisoprene-polystyrene copolymers. It is shown that only the polyisoprene phase is oxidized. The front photooxidized layers (0–22 μm) are analyzed by PAS, while the bulk (11–150 μm) is characterized by cross-sectional analysis of microtomed layers. A good agreement between the two methods is found in the region where the analyzed layers overlap (11–22 μm). The extent of the oxidation was determined by monitoring the ratio between the intensity of the carbonyl absorbance at 1718 cm⁻¹ and the absorbance at 1600 cm⁻¹. The results given in this article show that PAS FT-IR can be a rapid and nondestructive technique of quantitative characterization of the surface degradation of aged polymers.

Keywords

FT-IR PAS Micro-FT-IR Depth profiling Photooxidation

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References

Lemaire

Arnaud

and Lacoste

, Acta Polym. 39, 27 (1988).

Cunliffe

A. V.

and Davis

, Polym. Deg. & Stab. 4, 17 (1982).

Gillen

K. T.

and Clough

R. L

, Am. Chem. Soc. Symp. Ser. 475, 457 (1991).

Jouan

and Gardette

J. L

, Polym. Commun. 28, 239 (1987).

Jouan

Adam

Fromageot

Gardette

J. L.

and Lemaire

, Polym. Deg. & Stab. 25, 247 (1989).

Gardette

J. L.

Gaumet

and Philippart

J. L

, J. Appl. Polym. Sci. 48, 1885 (1993).

Gardette

J. L.

and Philippart

J. L

, J. Photochem. Photobiol. A-Chem. 43, 221 (1988).

Schoolenberg

G. E.

and Vink

, Polymer 32, 432 (1991).

Marshall

N. S. Allen G. P.

Vassilou

Moore

L. M.

Kotecha

J. L.

and Gardette

J. L

, Polym. Deg. & Stab. 20, 315 (1988).

10.

McClelland

Jones

R. W.

Bajic

S. J.

and Power

J. F

, Mikochim. Acta [Suppl.] 14, 613 (1997).

11.

Jiang

Palmer

R. A.

Barr

N. E.

and Morosoff

, Appl. Spectrosc. 51, 1238 (1997).

12.

Rosencwaig

and Gersho

, J. Appl. Phys. 47, 64 (1976).

13.

Urban

M. W.

, J. Coat. Technol. 59, 29 (1987).

14.

Dittmar

R. M.

Palmer

R. A.

Carter

R. O.

III , Appl. Spectrosc. Rev. 29, 171 (1994).

15.

Dolby

P. A.

and McIntyre

, Polymer 32, 4, 586 (1991).

16.

Delprat

and Gardette

J. L

, Polymer 34, 933 (1993).

17.

Nguyen

T. T.

, J. Appl. Polym. Sci. 38, 765 (1989).

18.

Qingde

Junjun

Guiwen

and Maosen

, J. Mol. Struct. 403, 231 (1997).

19.

Gonon

and Gardette

J. L

, paper submitted to Polymer.

20.

Adam

Lacoste

and Lemaire

, Polym. Deg. & Stab. 32, 51 (1991).

21.

Lemaire

Arnaud

and Gardette

J. L

, Rev. Gen. Caoutch. Plast. 87, 613 (1981).

22.

Palmer

R. A.

Jiang

E. Y.

and Chao

J. L

, Mikrochim. Acta [Supp.] 14, 591 (1997).

23.

Griffiths

P. R.

and De Haseth

J. A

, Fourier Transform Infrared Spectroscopy (John Wiley and Sons, New York, 1986), Vol. 83, Chap. 9, p. 323.