ON THE FREE-RADICALS PRODUCED IN GAMMA-IRRADIATED POLYACRYLAMIDE

被引：6

作者：

REDDY, NSR ^{[1
]}

REDDY, YS ^{[1
]}

RAO, BS ^{[1
]}

机构：

[1] KAKATIYA UNIV,DEPT PHYS,WARANGAL 506009,ANDHRA PRADESH,INDIA

来源：

RADIATION EFFECTS AND DEFECTS IN SOLIDS | 1994年 / 129卷 / 3-4期

关键词：

FREE RADICALS; GAMMA-IRRADIATION; POLYACRYLAMIDE; ESR;

D O I：

10.1080/10420159408229026

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

Nature of free radicals produced on gamma-irradiation of polyacrylamide (PAAm) have been investigated by electron spin resonance (ESR) spectroscopy. The ESR spectrum observed for irradiated PAAm at room temperature (RT) is a triplet with hyperfine (hf) splittings of 24 G and intensity distribution of 1:3:1. Superposition of component triplet, together with a singlet originating from a different radical is found to be the best fit to the experimental spectrum as RT, as has been deduced from the total curve fitting method. The ESR spectrum of irradiated PAAm at liquid nitrogen temperature (LNT) is a sharp singlet. The spectra at RT and LNT are attributed to different interconvertible forms of the free radicals of the type approximately CH2-C(CONH2)-CH2 approximately. A mechanism for radiative degradation of PAAm is proposed.

引用

页码：273 / 278

页数：6

共 10 条

[1] NMR AND ESR STUDIES OF SOLID-STATE POLYMERIZATION OF VINYL MONOMERS .1. ACRYLAMIDE [J].

CHACHATY, C ;

FORCHION.A .

JOURNAL OF POLYMER SCIENCE PART A-1-POLYMER CHEMISTRY, 1972, 10 (07) :1905-&

[2] ESR STUDY OF INITIAL REACTION OF PHOTODEGRADATION OF NYLON-6 [J].

HEUVEL, HM ;

LIND, KCJB .

JOURNAL OF POLYMER SCIENCE PART A-2-POLYMER PHYSICS, 1970, 8 (03) :401-&

[3]

MURTHY MR, 1990, J POLYM SCI POL LETT, V28, P112

[4]

OGAWA S, 1960, J PHYS SOC JPN, V16, P1488

[5] ELECTRON-SPIN-RESONANCE STUDY OF THE REACTION OF GASES WITH THE FREE-RADICALS PRODUCED BY UV-RADIATION ON THE SURFACES OF ACRYLAMIDE AND SOME CRYSTALLINE MATERIALS .2. RESULTS OF H-2, SO2 AND CL-2 ADMISSION TO ACRYLAMIDE, PROPIONAMIDE, METHACRYLAMIDE AND POLYACRYLAMIDE [J].

RAMELOW, U ;

BAYSAL, B .

POLYMER, 1987, 28 (06) :961-968

[6]

RAMELOW US, 1979, J APPL POLYM SCI APP, V35, P329

[7] ELECTRON-SPIN-RESONANCE AND UV ABSORPTION OF IRRADIATED POLYVINYL-ALCOHOL) [J].

RAO, BS ;

MURTHY, MR .

JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, 1987, 25 (09) :1897-1902

[8]

SAO BS, 1989, J POLYM SCI POL LETT, V27, P1189

[9]

UEDA H, 1962, J POLYM SCI, V6, P251

[10]

UEDA H, 1962, J POLYM SCI, V8, P333

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