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Preparation of Nanocapsules via Emulsifier-Free Miniemulsion Polymerization

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Nanocapsules containing hexadecane or paraffin as core materials and polystyrene as a shell were produced in a new method through emulsifier-free miniemulsion polymerization using 2,2′ azobis (2-amidinopropane) dihydrochloride (V-50) as a cationic ionizable water-soluble initiator. The effect of some parameters such as hexadecane or paraffin amounts and polymerization duration on morphology and thermal properties of resulting nanocapsule particles was studied. Transmission electron microscopy (TEM) showed that the products had latex particles having a size range of about 200–700 nanometer and both nanocapsules with core–shell morphology and solid particles. The phase change temperature and phase transition heat of the produced nanocapsules were determined by differential scanning calorimetric (DSC) analyses. Thermogravimetric analysis (TGA) was also used to prove the capsulation and to determine the amount of hexadecane or paraffin in the nanocapsules.
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Document Type: Research Article

Publication date: 2009-07-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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