Table of Content

20 August 1985, Volume 3 Issue 3

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STUDY ON THE COVERING POWER OF POSITIVE AND NEGATIVE IMAGES IN DIFFUSION TRANSFER PROCESS

CHEN PING, YU SHU-FANG, SHENG LI-QIN, ZHENG DE-SHUI

1985, 3(3):  1-5.  DOI: 10.7517/j.issn.1674-0475.1985.03.1

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In this paper the covering power of the positive and negative images was determined. It was found that the covering power of the positive image is 3-10 times higher than that of the negative. It was found that the more the silver deposited, the lower the covering power will be on the same positive. And the covering power is seen to depend greatly on the density. With increasing density, the covering power diminishes exponentially. The experimental results showed that any change of the physical development nuclei or nuclei carriers (different kinds of hydrophilic silica) in the positive receiving layer will affect the covering power of the final image, and that the smaller the particle size of deposited silver, the higher the covering power.

1985, 3(3):  5-5.  DOI: 10.7517/j.issn.1674-0475.1985.03.5

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A POLYETHER-AROMATIC AZO POLYMERIC DYE

CHEN LIU-SHENG, DU JIN-HUAN, WANG YAN-QIAO

1985, 3(3):  6-12.  DOI: 10.7517/j.issn.1674-0475.1985.03.6

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Poly (p-N, N-dimethylamino azobenzol glycidyl ether), a polyether-aromatic azo polymeric dye, was synthesized from p-N, N-dimethylamino aniline (Ⅰ) following the reactions as given: The characterization of the intermediate (Ⅱ), monomer (Ⅲ) and polymer dye (Ⅳ) were performed by elemental analysis, IR, ¹³C NMR, VIS-spectroscopy, laser light scattering and DSC. The polymer dye studied in this paper is soluble in stronger polar solvents (such as DMF) with M_w = 2.2×10⁴ and soft point 90-95℃. The photosensitive image recording materials, which were made from the polymer dye with vinylidene chloride/methyl acrylate copolymers, were shown to have the image-forming behaviour under UV-irradiation. It is of particular interest that the polymer dyes can be fixed more strongly in the photosensitive layer.

COMPUTER SIMULATION OF GRANULARITY MEASUREMENT FOR PATTERNED SILVER HALIDE LAYERS Ⅱ. THE EFFECT OF CIRCULAR SAMPLING APERTURE

XIA PEI-JDE, LIU YU-CHEN

1985, 3(3):  13-19.  DOI: 10.7517/j.issn.1674-0475.1985.03.13

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A model of computer simulation measurement of the granularities with circular sampling aperture is used for studying the granularities of the image layers which are obtained from the corresponding patterned silver halide layers. The results show that a variation in circular sampling aperture size may cause much less fluctuation of the granularity values measured, i.e. which may be more steady, than that in square sampling aperture size. In addition, it is also shown that all patterned layers have the same variation trend versus density.

A STUDY ON THE DIELECTRIC SPECTRA OF DOPED OCTAHEDRAL SILVER BROMIDE EMULSIONS ——EFFECT OF Cd²⁺ AND Br^- IONS

CHENG HU-MIN

1985, 3(3):  20-26.  DOI: 10.7517/j.issn.1674-0475.1985.03.20

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The dielectric spectra of the monodisperse octahedral silver bromide emulsions added CdBr₂ and KBr at various concentrations were studied. It was found that the dielectric absorption peak of the octahedral AgBr emulsions shifted markedly toward lowerfrequencies with the increase of CdBr₂ doped in 0-2×10^-2 mol/mol AgBr range. The Cd²⁺ amount that can incorporate into the lattice on the surface of AgBr crystal depends on both Cd²⁺ and Br^- concentrations in emulsions.Most of the doped Cd²⁺ ions can be removed by washing with water. After washing, the dielectric absorption peak of the sample shifted back to higher frequency. The reversibility of Cd²⁺ doping indicated that the Cd²⁺ ions might be on the surface of AgBr crystal. The reversible change of log f_max showed that the interface polarization effect in the heterogeneous dielectric was affected mainly by the composition and structure of the surface region of the grains in the dispersive phase if the continuous phase was fixed.

THERMAL CHARACTERIZATION OF PHOTOPOLYMERIZABLE RESIN CONTAINING POLY (VINYL ALCOHOL)

LIANG KUI-MING, YE LI-MKI, YE TING-EN, LI MAN-FU

1985, 3(3):  27-31.  DOI: 10.7517/j.issn.1674-0475.1985.03.27

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This paper shows that the differential scanning calorimetry (DSC) is a very useful tool for the characterization of properties (e.g. photosenskivity and storage stability) of photopolymerizable resin containing poly (vinyl alcohol). Pour systems of the photopolymerizable resins (S₁, S₂, S₃, S₄) were studied with DSC. Results reveal that the order of photosensitivity for the above gfiving samples is as follows: S₄>S₃>S₁>S₂. The addition of maleic anhydride (MAn) speeds up the photopolymerization, but makes storage stability worse. However, when MAn is esterified by hydroxy-ethyl methacryla-te and then added to the system, both photosensitivity and storage stability are improved.

SOLVENT EFFECT TO CYANINE DYES

TANG YING-WU, CAO WEI, SONG XIN-QI, LIU WEN-YUAN, ZHANG FU-SHI

1985, 3(3):  32-38.  DOI: 10.7517/j.issn.1674-0475.1985.03.32

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The absorption spectra of 16, cyanine dyes in 18 solvents of various refractive index and polarity have been investigated in this work. It was found that the positive sol-vatochromism of the M-band of the molecules was not only dependent upon the refractive index n of the solvent used, but also on the dielectric constant ε. In correlating the band shift (in cm^-1) with the function f(n,ε) = (n²-1/2n²+1) + α(ε-1/ε+2) better linearity has been obtained. The parameter a in this function has a value less than unity, its sign was determined by the sign of solvatochromism of the system studied. In water containing bi-liquid system, the negative solvatochromism of the dimeri-zed dye molecules was also in good linearity with solvent molecules, the dimerized dye molecules can be treated as an isolated optical element.

A STUDY ON PHOTOISOMERIZATION OF ISOSAFROLE

CAO YI, WU WEI, MING YANG-FU, ZHANG BAO-WBN

1985, 3(3):  39-43.  DOI: 10.7517/j.issn.1674-0475.1985.03.39

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Photoisomerization of isosafrole has been studied. Direct irradiation or triplet sen-sitization results in cis-trans isomerization and the stationary states become richer in cis-isosafrole. When 9,10-dicyanoanthraeene, 9-cyanoanthracene and chloranil are used as sensitizer, electron transfer photoisomerization takes place and the stationary states become richer in the trans-isomer. The reactants and products are identified by GC-MS, IR and NMR. A tentative mechanism for the photoisomerization is proposed.

1985, 3(3):  43-43.  DOI: 10.7517/j.issn.1674-0475.1985.03.43

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MAGNETIC FIELD EFFECT ON PHOTOCHEMISTRY PHOTOLYSIS OF ARYL SULFONES ABSORBED ON SILICA GEL SURFACE

TONG ZHEN-HE

1985, 3(3):  44-49.  DOI: 10.7517/j.issn.1674-0475.1985.03.44

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The photochemistry of aryl sulfones absorbed on the surface of silica gel has been investigated. It is observed that silica surface provides a cage environment which restricts the translational motion of the radical pair produced by photolysis of sulfones. A weak exteral magnetic field (-150G) may remarkably change the product distribution. The mechanism of the magnetic field effect on radical pair reactions is discussed.

1985, 3(3):  49-49.  DOI: 10.7517/j.issn.1674-0475.1985.03.49

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A STUDY ON THE PHOTOSENSITIVE CHARACTERISTICS OF DIAZIDO-COMPOUNDS

HUANG JUN-LIAN, YU TONG-YIN

1985, 3(3):  50-56.  DOI: 10.7517/j.issn.1674-0475.1985.03.50

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The photosensitive characteristics of five diazido-compounds were studied. By irradiating the toluene solution of these diazido-compounds with high pressure mercury lamp, it is found that within a certain time interval, there are two isosbestic points in the UV spectra of conjugated diazido-compounds. This is time interval of first order kinetics of photolysis. By means of isolation and identification of photodecomposed products of diazido-compounds, the biphotonic mechanism of photolysis is confirmed. Their quantum efficiencies were determined through monochromatic lights which are corresponding to the absorption peaks in the UV spectra.

1985, 3(3):  57-57.  DOI: 10.7517/j.issn.1674-0475.1985.03.59

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1985, 3(3):  57-57.  DOI: 10.7517/j.issn.1674-0475.1985.03.57

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1985, 3(3):  58-64.  DOI: 10.7517/j.issn.1674-0475.1985.03.58

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