Volume 6 - No. 2

تولید و مشخصه¬یابی میکروکپسول¬های حاوی رزین اپوکسی 828 جهت استفاده در پوشش¬های ¬¬خودترمیم¬شونده

طاهره ابراهیمی صدرآبادی, سعیدرضا اله کرم و ناصر توحیدی

تاريخ ثبت اوليه: // ، تاريخ دريافت نسخه اصلاح شده: // ، تاريخ پذيرش قطعي: //

چكيده     در یک دهه گذشته تحقیقات گسترده¬ای در زمینه¬ پوشش¬های خودترمیم¬شونده صورت گرفته است. در مقاله حاضر به تولید و مشخصه¬یابی میکروکپسول¬های حاوی رزین اپوکسی (به عنوان ماده ترمیم¬کننده) پرداخته شده است. ماده تشکیل¬دهنده پوسته میکروکپسول¬ها اوره- فرمالدهید است که با استفاده از روش پلیمریزاسیون درجا تولید شده است. این کپسول¬ها جهت استفاده در پوشش¬های خودترمیم¬شونده حاوی میکروکپسول ساخته شده¬اند. بررسی خواص مختلف میکروکپسول¬های تولیدی با استفاده از ابزارهای مختلفی نظیر میکروسکوپ الکترونی روبشی (SEM)، طیف‌سنجی تبدیل فوریه مادون قرمز (FTIR)، آنالیز توزین حرارتی (TGA) و گرماسنجی افتراقی (DSC) صورت گرفت. نتایج به¬دست آمده حاکی از تولید موفقیت¬آمیز این میکروکپسول¬ها است. قطر میکروکپسول¬های تولیدی به طور متوسط 100 میکرون است و دارای سطح خارجی مملو از نانوذرات اوره- فرمالدهید می¬باشد که به چسبندگی بیشتر این میکروکپسول¬ها به زمینه دلخواه کمک می¬نماید. میکروکپسول¬های تولیدی دارای پایداری شیمیایی و حرارتی مناسب جهت کاربردهای مختلف در زمینه پوشش¬های خودترمیم¬شونده هستند.

كلمات كليدي    میکروکپسول، اپوکسی، خودترمیم¬شونده، پوشش هوشمند.

Synthesis and Characterization of Microcapsules Containing Epoxy Resin (Epon 828) for Self-healing Coatings

Tahere Ebrahimi Sadrabadi, Saeid reza Allah karam and Naser Towhidi

Abstract    In the field of coatings, extensive laboratory research has been conducted in the last decade. In the present work, effectiveness of epoxy resin filled microcapsules was investigated for future using in healing of cracks generated in coatings. Microcapsules were prepared by in situ polymerization of urea?formaldehyde resin to form shell over epoxy resin droplets. The optimal process parameters for synthesizing the microcapsules were selected. The as-synthesized microcapsules were studied by various characterizations techniques, including scanning electron microscope (SEM), Fourier transform-infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The results indicate that microcapsules containing epoxy resins can be synthesized successfully. The average size is around 100 m. The rough outer surface of microcapsule is composed of agglomerated urea?formaldehyde nanoparticles. The microcapsules basically exhibit good storage stability at room temperature, and they are chemically stable before the heating temperature is up to approximately 250 C.

Keywords    Microcapsule, Epoxy, Self-healing, Smart coating.



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