The photodegradation of poly(1,3‐phenylene isophthalamide) films in air

Carlsson, D. J.; Gan, Lu; Parnell, R. D.; Wiles, D. M.

doi:10.1002/pol.1973.130111104

Cited by 18 publications

(9 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…absorption changes above 330 nm (Fig. la), so that yields of these products can also be calculated from their overlapping spectra (E,,, 5.70 x lo3 and E,,, 2.5 x lo3 for 2-aminobenzophenone and E,,, 4.48 x lo3 and E,,, 1.71 x lo4 M-'cm-' for Caminobenzophenone in ethanol). These U.V.…”

Section: Resultsmentioning

confidence: 99%

The Photolyses of Fully Aromatic Amides

Carlsson¹,

Gan²,

Wiles³

1975

Can. J. Chem.

Self Cite

View full text Add to dashboard Cite

The 254 nm photolyses of ethanol solutions of four fully aromatic amides were followed by liquid chromatography and u.v. spectroscopy, and quantum yields for the major products calculated. The photolysis of benzanilide was examined in detail at various wavelengths and in several solvents, both in the presence and absence of oxygen. Quantum yields for 2- and 4-aminobenzophenones and products from free radical precursors decreased with increasing solvent polarity and with increasing incident wavelength of irradiation. Oxygen had no affect on aminobenzophenone formation but produced benzoic acid from free radical fragments which escaped the solvent cage. The results are tentatively interpreted in terms of an energy dependent radiationless conversion to a reactive 1π*-carbonyl which then cleaves the N—C bond to give caged free radicals, rather than by a concerted, nonradical rearrangement.

show abstract

Section: Resultsmentioning

confidence: 99%

The Photolyses of Fully Aromatic Amides

Carlsson¹,

Gan²,

Wiles³

1975

Can. J. Chem.

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, even though they show favorable thermal properties [7][8][9][10][11][12][13][14], they exhibit very low resistance to sunlight exposure [15][16][17][18][19][20][21]. Accordingly, based on our former research work, a kind of new method was herein put forward to improve the sunlight resistant property of high performance fibers.…”

Section: Introductionmentioning

confidence: 99%

Improving the photo-stability of high performance aramid fibers by sol-gel treatment

Liu

2008

Fibers Polym

View full text Add to dashboard Cite

Although high performance fibers possess higher thermal resistant properties, they show very low sunlight stability. In this paper, a new sol-gel treatment method was used to enhance their light-resistant properties. Their mechanical property retention ratios (tenacity, extension, modulus) of fibers treated with titanium hydrosol were higher than those of the original Kevlar ® 129, PBO, and Kermel ® fibers after light irradiation. Moreover, Kermel ® fiber showed the highest improvement among the three kinds of fibers.

show abstract

“…8–10 We primarily observed photodegradation and photooxidative degradation of heterochains, leading to lower mechanical strength. Polyaramides have also interesting photosensitive properties 11, 12 with chain cleavage and formation of oxidized groups.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics of surface self‐developing structure formation on polyamide films under ultraviolet irradiation

Rebouillat¹,

Lavielle²,

Wilmet³

2002

J of Applied Polymer Sci

View full text Add to dashboard Cite

Polyamide terpolymer films can be obtained by the evaporation of a solvent-terpolymer-photoinitiator mixture on a glass plate. Through ultraviolet (UV) irradiation, self-developing properties are observed. The nuclear magnetic resonance (NMR) study of the photochemical reaction involved in such a process permits us to propose a mechanism with a diffusion of solvent in the irradiated areas. The thermodynamics of irreversible process have been applied to the analysis of such a system behavior, and an analysis of the stability of the system resulting from its residual solvent content has been made.

show abstract

The photodegradation of poly(1,3‐phenylene isophthalamide) films in air

Cited by 18 publications

References 5 publications

The Photolyses of Fully Aromatic Amides

The Photolyses of Fully Aromatic Amides

Improving the photo-stability of high performance aramid fibers by sol-gel treatment

Thermodynamics of surface self‐developing structure formation on polyamide films under ultraviolet irradiation

Contact Info

Product

Resources

About