Optimum core-shell ratio in microcapsules containing a reactive solution
- سال انتشار: 1395
- محل انتشار: دوازدهمین سمینار بین المللی علوم و تکنولوژی پلیمر
- کد COI اختصاصی: ISPST12_438
- زبان مقاله: انگلیسی
- تعداد مشاهده: 362
نویسندگان
Iran Polymer and Petrochemical Institute , Tehran- Iran
Iran Polymer and Petrochemical Institute , Tehran- Iran
Iran Polymer and Petrochemical Institute , Tehran- Iran
چکیده
The urea-formaldehyde microcapsules containing a peroxide solution were synthesized through oil-in-water emulsion. The optimum core-shell ratio was investigated by optical microscopy and scanning electron microscopy. Optimum core-shell ratio leads to a more efficient releasing and subsequently more healing ability. Five distinct core-shell ratios of 60/40, 70/30, 80/20, 90/10 and 95/5 were synthesized. It was suggested that the core-shell ratio of 90/10 produced the most spherical microcapsules without shell wrinkles. Microcapsules less than the above-mentioned core-shell ratio suffered from a thick layer of porous UF on the surface which results in agglomeration of microcapsules and consequently less stability. The attempt to synthesize microcapsules with core-shell ratio of 95/5 led to very unstable microcapsules with such a thin UF shell that released after filtration. The optimum core-shell content was chosen by optical microscopy and scanning electron microscopy and the core content of 90 percent was confirmed by thermo gravimetric analysis (TGA )کلیدواژه ها
Microencapsulation- oil-in-water emulsion- reactive solution- core-shell ratio- core contentاطلاعات بیشتر در مورد COI
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