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مقاله Improvement of Microencapsulated PCMs Charachteristic by Variation of Effective Curing Parameters فایل ورد (word) دارای 4 صفحه می باشد و دارای تنظیمات در microsoft word می باشد و آماده پرینت یا چاپ است

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بخشی از متن مقاله Improvement of Microencapsulated PCMs Charachteristic by Variation of Effective Curing Parameters فایل ورد (word) :

سال انتشار: 1391
محل انتشار: چهاردهمین کنگره ملی مهندسی شیمی ایران
تعداد صفحات: 4
نویسنده(ها):
Zeinab Alinejad – Polymer Science Department, Iran Polymer & Petrochemical Institute, Tehran, Iran
Abbas Rezaee Shirin-Abadi – Polymer Laboratory, Chemistry Department, School of Science, University of Tehran, Tehran, Iran
Fahimeh Khakzad – Polymer Science Department, Iran Polymer & Petrochemical Institute, Tehran, Iran
Maryam Ghasemi –

چکیده:

Microcapsules containing n-hexadecane (HD) as the core and melamine-formaldehyde (MF) prepolymer as the shell material were prepared via in-situ polymerization and some effective curing parameters such as pH, temperature and hardener type were invesigated as the affecting factors on the characteristics of the resulting microcapsules. The morphology and thermal properties of the microcapsules were studied using scanning electron microscopy (SEM) and differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA),respectively.The surface morphology of microcapsules showed that the prepared microcapsules at low temperature and high pH were mechanically unstable. From the DSC analysis, it was concluded that for all samples, encapsulation efficiencies of about 90-100% were obtained. It was shown by TGA that the sapmples prepared at 60 °C and pH of 5 had higher thermal stability

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