کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1265700 1496873 2016 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Ultrasound enhances lipase-catalyzed synthesis of poly (ethylene glutarate)
ترجمه فارسی عنوان
سونوگرافی باعث افزایش سنتز لیپاز کاتالیز شده از پلی (گلوتاتین اتیلن) می شود
کلمات کلیدی
سونوگرافی؛ لیپاز؛ سنتز آزاد بدون حلال؛ پلی (گلوتاتات اتیلن)؛ جنبش
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی (عمومی)
چکیده انگلیسی


• Faster kinetics was found on ultrasound based polyesterification.
• Vacuum was found essential to enhance the polyesterification.
• Ultrasound yield a higher DPn in a 72 h reaction time.

The present work explores the best conditions for the enzymatic synthesis of poly (ethylene glutarate) for the first time. The start-up materials are the liquids; diethyl glutarate and ethylene glycol diacetate, without the need of addition of extra solvent. The reactions are catalyzed by lipase B from Candida antarctica immobilized on glycidyl methacrylate-ter-divinylbenzene-ter-ethylene glycol dimethacrylate at 40 °C during 18 h in water bath with mechanical stirring or 1 h in ultrasonic bath followed by 6 h in vacuum in both the cases for evaporation of ethyl acetate. The application of ultrasound significantly intensified the polyesterification reaction with reduction of the processing time from 24 h to 7 h. The same degree of polymerization was obtained for the same enzyme loading in less time of reaction when using the ultrasound treatment. The degree of polymerization for long-term polyesterification was improved approximately 8-fold due to the presence of sonication during the reaction. The highest degree of polymerization achieved was 31, with a monomer conversion of 96.77%. The ultrasound treatment demonstrated to be an effective green approach to intensify the polyesterification reaction with enhanced initial kinetics and high degree of polymerization.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultrasonics Sonochemistry - Volume 31, July 2016, Pages 506–511
نویسندگان
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