تفاصيل الوثيقة

نوع الوثيقة : مقال في مجلة دورية 
عنوان الوثيقة :
Photochromic properties of (E)-dicyclopropylmethylene-(2,5-dimethyl-3- furylethylidene)-succinic anhydride doped in polystyrene thin films
Photochromic properties of (E)-dicyclopropylmethylene-(2,5-dimethyl-3- furylethylidene)-succinic anhydride doped in polystyrene thin films
 
الموضوع : كيمياء 
لغة الوثيقة : الانجليزية 
المستخلص : Fulgide 1-E doped in polystyrene polymer films was heated at various annealing temperatures. Upon irradiation with UV light (366 nm), fulgide 1-E undergoes a conrotatory ring closure to the pink colored closed form 1-C. The later color was switched back to the original color when the films were irradiated with white light. The kinetics of photocoloration and photobleaching processes were followed spectrophotometrically by monitoring the absorbance of the ring closed product 1-C at its λmax of 525 nm. The first-order plots of photocoloration reaction shows two distinct linear lines. The slopes of which corresponding to the first-order rate constants k 1 and k2, where k1 is the rate constant at initial reaction times and k2 is that at late reaction times. These results suggest the plausible presence of two conformers of the ring opened form 1-E which reacts in sequence. On the other hand, photobleaching reaction shows a simple first-order reaction rate. It was found that for photocoloration reaction, the rate constant at initial reaction times is slower than that at late reaction times. Similarly, the photocoloration reaction is slower than the photobleaching reaction and both reactions increases with increasing the annealing temperatures. It was found that there was almost complete loss of photochemical fatigue resistance of fulgide 1 doped in polystyrene polymer film irrespective of the annealing temperature. © 2008 World Scientific Publishing Company. 
ردمد : 0256-7679 
اسم الدورية : Chinese Journal of Polymer Science (English Edition), Volume 26, Issue 4, July 2008, Pages 433-441 
المجلد : 26 
العدد : 4 
سنة النشر : 2008 هـ
2008 م 
عدد الصفحات : 8 
نوع المقالة : مقالة علمية 
تاريخ الاضافة على الموقع : Thursday, October 15, 2009 

الباحثون

اسم الباحث (عربي)اسم الباحث (انجليزي)نوع الباحثالمرتبة العلميةالبريد الالكتروني
Bahajaj, A.ABahajaj, A.Aباحثدكتوراه 
عبدالله محمد أحمد عسيريAbdullah Mohamed Asiriباحثدكتوراهaasiri2@kau.edu.sa

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