三苯基磷对PTG材料照相性能的影响

本文研究了三苯基磷(PPh₃)对以AgSt为银源的亲水型PTG材料照相性能的影响:PTG材料的感光度随PPh₃用量不同而变化,PPh₃用量相对较少时,感光度随PPh₃用量增加而提高;PPh₃用量增加到一定程度,感光度达到极大值;进一步增加PPh₃用量,感光度反而随PPh₃用量增加而下降.据分析结果推测,在PPh₃用量较少时,PPh₃的作用主要是打开AgSt二聚体的八元环而生成一种中间配合物,该中间体对热显影有促进作用;在PPh₃用量较多时,PPh₃的作用主要是与AgSt作用生成稳定的四元环配合物,该配合物对热显影有抑制作用.PPh₃的引入也会影响光敏元中潜影的形成效率,有利于提高感光度.

Effect of Ph3P on Photographic Properties of PTG Materials

The effect of triphenylphosphine(PPh3) on the photographic characters of water-base PTG materials based on silver stearate as silver sources was studied.The results showed that the sensitivity of the PTG materials elevated with increasing the PPh3 amount at a relatively low PPh3 content;and the sensitivity reached a maximal value with increasing the PPh3 amount till about 10%;when continuing to increase the PPh3 amount,however,the sensitivity decreased with increasing the PPh3 content.The analysis results supposed that the eight-membered ring of AgSt dimer was destroyed by the addition of small amount of PPh3,and a new intermediate compound formed which accelerated the thermal development;A four-member-ring complex composed of PPh3 and AgSt was supposed to have formed when large amount of PPh3 was used,and the four-member-ring complex inhibited the thermal development.The introduction of PPh3 into PTG materials could also influence the efficiency of latent image formation for light sensitive element,which contributed to improve the sensitivity.