Sage Journals: Discover world-class research

Abstract

The photodegradation of unprotected bright nylon-6 fiber by exposure to daylight and in the fadeometer has been studied. The degradation has been found to be caused by random scission of the polymer chain. Although the degrada tion produces appreciable changes in the tensile strength and viscosity average molecular weight of the nylon-6 fiber, the polymer chain itself is not attacked appreciably as substantiated by infrared measurements. A possible mechanism for the photodegradative breakdown of nylon-6 fiber so far as the formation of nonvolatile water-soluble products is concerned is postulated and substantiated by identifying the degradative products obtained. The efficacy of a selected uv absorber in reducing the photodegradation of nylon-6 fiber has also been studied.

Keywords

Bright nylon-6 fiber (polyamide)protected unprotected uv absorber (2 2'-dihydroxy-4 4'-dimethoxy benzophenone). Photodegradation fadeometer temperate region tropical atmosphere controlled conditions of exposure irradiation. Mechanism of degradation random scission of the polymer chain pyrolysis peptide group pyrrole. Tensile strength viscosity m-cresol intrinsic viscosity Mark-Houwink's equation molecular weight water solubles pH Ehrlich reac tion uv spectra ir spectra.

Get full access to this article

View all access options for this article.

References

Achhamer, B.G. , Kline, G.M. , and Reinhart , F.W. , Mechanism of the Degradation of Polyamides, J. Res. Nat. Bur. Stand . 46, 391-421 (1951).

Algera, A. , Boasson, E.H. , and Kamerbeek, B. , The Photooxidation of Nylon-6 and 66, Rec. Trar. Chim . 81, 624-634 (1962).

Anslow, G.A. and Nassar, S.C. , Absorption of Ultra-violet Energy by the Peptide Linkage, J. Opt. Soc. Amer . 31, 118-123 (1941).

Anslow, G.A. and Lyman, E.R. , Spectrophotometric Study of Glutathione , J. Opt. Soc. Amer. 31, 114-117 (1941).

Atlas, S.M. , Cernia, E. , and Mark, H.F. , "Man-made Fibers Science and Technology," Vol. 2, New York, John Wiley & Sons , 1968.

Brandrup, J. and Immergut, E.H. , "Polymer Handbook," New York, John Wiley & Sons, 1968.

Bubser, W. , Studies of the Reaction Mechanism Occurring in the Photodegradation of Polyamide Fibers. I: Changes in Polyamide Fibers Caused by Exposure to Light, Z. Ges. Textil Ind, 65, 108-111 (1963).

Ciuta, I.Z. and Solomon, O.F. , Determination de la Viscosité Intrinsique de Solutions de Polymers par Une Simple Détermination de la Viscosité, J. Appl. Polym. Sci. 6, 683-686 (1962).

Field, J.E. , Gehman, S.D. , and Woodford, D.E. , Applications of Infra-Red Methods in the Structural Examination of Synthetic Rubber, J. Appl. Phys. 17, 386-392 (1946).

10.

Flory, P.J. and Schaefgen, J.R. , Synthesis of Multi-chain Polymers and Investigation of their Viscosities, J. Amer. Chem. Soc . 70, 2709-2718 (1948 ).

11.

Grassie, N. and Melville, H.W. , Thermal Degradation of Polyvinyl Compounds. II: The Degradation of Benzoyl P.eroxide Catalyzed Polymethyl Methacrylate , Proc. Roy. Soc. A199, 14-23 (1949).

12.

Klotz, I.M. , Ultra-violet Absorption Spectroscopy, J. Chem. Educ. 22, 328-335 (1945).

13.

Kroes, G.H. , Photooxidation of Nylon-6 and 66. Rec. Trav. Chim. 82, 979-987 (1963).

14.

Lerch, E. and Marek, B. , Photodegradation and Yellowing of Polyamides J. Soc. Dyers and Colour. 81, 481-487 (1965).

15.

Major, H.M. and Sharples, A. , Determination of Constants in the Intrinsic Viscosity—Molecular Weight Equation, J. Polym. Sci . 27, 433-440 (1958).

16.

Mochel, W.E. and Sharkey, W.H. , Mechanism of the Photooxidation of Amides , J. Amer. Chem. Soc. 81, 3000-3005 (1959).

17.

Moore, R.F. , The Photochemical Degradation of Polyamides and Related Model N-Alkylamides, Polymer 4, 493-513 (1963).

18.

Moses, B.C. , Stephenson, C.V. , and Wilcox, W.S. , Ultraviolet Irradiation of Plastics. I: Degradation of Physical Properties, J. Polym. Sci . 55, 451-464 (1961).

19.

Rice, F.O. and Rice, K. , "The Aliphatic Free Radicals," Maryland, John Hopkins University Press, 1935.

Photodegradation of Nylon-6

Abstract

Keywords

Get full access to this article

References