Weakened bonds in polymer degradation intermediates as probable sites of macromolecular scission

A. Shyichuk; D. Melnyk; P. Cysewski

Published : 2022-09-01

Vol. 49 No. 6 (2004)

Weakened bonds in polymer degradation intermediates as probable sites of macromolecular scission

A. Shyichuk D. Melnyk P. Cysewski

Abstract

Bond strengths in macroradicals and hydroperoxides of polypropylene and polystyrene have been estimated using quantrum chemical methods. Both secondary and tertiary polypropylene oxy macroradicals have been found to be clearly inclined to beta-scission of main chains. Bond strengths in the main chain of polystyrene alkyl macroradicals proved to be almost unchanged in comparison with initial macromolecule. Among oxygen-containing polystyrene intermediates the most degradable ones seem to be secondary oxy and secondary peroxy macroradicals.

Keywords

photooxidation ; macromolecular scission ; quantum chemical method ; polypropylene ; polystyrene fotoutlenianie ; pękanie makrocząsteczek ; metoda kwantowo-chemiczna ; polipropylen ; polistyren

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Shyichuk, A., Melnyk, D., & Cysewski, P. (2022). Weakened bonds in polymer degradation intermediates as probable sites of macromolecular scission. Polimery, 49(6), 449–452. Retrieved from https://polimery.ichp.vot.pl/index.php/p/article/view/1772

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Remove 1. Allen N.S, Edge M. “Fundamentals of Polymer Degradation and Stabilization”, Elsevier Applied Science 1992,

2. Rabek J. F: “Polymer Photodegradation. Mechanisms and Experimental Methods", Chapman & Hall 1995.

3. Gugumus F: Polym. Degrad, Stab, 2001, 74, 327

4. Lipiński W., Ogonowski J., Uhniat M. Polimery 2002, 47, 713.

5. Sobków D., Czaja K.: Polimery 2003, 48, 627

6. Stevenson W,, White J. R: J. Mater. Sci. 2003,37, 1091

7. Navarro R., Torre L,, Kenny J. M. Jiménez A. Polym. Degrad. Stab. 2003, 82, 279.

8. Shyichuk A., Melnyk D., White J. Re J. Polym, Sci. Polym. Chem. 2003, 41, 1070.

9. Reed A. E,, Curtiss L, A. Weinhold F: Chem. Rev. 1988, 88, 899.

10. HyperChem(TM)Professional 6. 1, Hypercube, Inc. Gainesville 2001

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A. Shyichuk polimery@ichp.pl

Affiliation
University of Technology and Agriculture, Faculty of Chemical Technology and Engineering, ul. Seminaryjna 3, 85-326 Bydgoszcz,

D. Melnyk

Affiliation
PreCarpathian University, Bio-Organic Chemistry Department, Ivano-Frankivsk, 76025 Ukraine

P. Cysewski

Affiliation
Ludwig Rydygier Medical University of Bydgoszcz, ul. Kurpińskiego 5, 85-950 Bydgoszcz