Preparation and Properties of Water Repellent Polystyrene-TiO2 Coatings

Sundarajan, T and Abirami, S and Manohar, P and Aruna, ST (2012) Preparation and Properties of Water Repellent Polystyrene-TiO2 Coatings. Transactions of the Indian Ceramic society, 71 (1). pp. 25-30. ISSN 0371-750X

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Recently, there has been a great demand for hydrophobic (contact angle >90o) and super-hydrophobic surfaces (contact angle >150o) in industry for a variety of applications due to their easy to clean nature. In the present study efforts have been made to prepare hydrophobic polymer nanocomposite coatings containing titania nanoparticles. Titanium dioxide (TiO2) powders have been prepared by hydrothermal and co-precipitation methods and have been characterized by X-ray diffractometry, field emission scanning electron microcopy (FESEM) and Raman spectroscopy. The Raman and XRD studies confirm the presence of anatase titania for the hydrothermal synthesized and commercial titania powders. Titania derived from precipitation technique contains 68% rutile titania. Polymer based nanocomposite coatings have been prepared using polystyrene (PS) as the matrix and titania nanopowders as the dispersed phase. The obtained coatings have been characterized for contact angle and microstructure. Of the three sources of TiO2 used hydrothermal TiO2 gives higher contact angle values. Heating the THF-PS-TiO2 solution to a temperature of 50o-60oC helps in increasing the water contact angle (WCA). The FESEM images of PS-TiO2 coatings reveal microstructure akin to the fibers produced by electro-spinning method. The X-ray mapping pattern of PS-TiO2 confirm the presence of carbon (polystyrene) and titanium elements. Even a small amount (0.03 g) of hydrothermal titania with 0.7 g of polystyrene gives a WCA as high as 149.77o which is close to the WCA of super hydrophobic range.

Item Type: Article
Uncontrolled Keywords: Hydrophobicity, Contact angle, Polystyrene, TiO2
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: Ms Indrani V
Date Deposited: 10 Oct 2012 07:59
Last Modified: 11 Oct 2012 05:18

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