Browsing by Author "Uğur, Saziye"

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Citation Count: 4
Polymer/carbon nanotube composite film formation: A fluorescence study
(Wiley-Blackwell, 2014) Yargı, Önder; Uğur, Saziye; Pekcan, Önder
In this study the effect of multi-walled Carbon nanotube (MWNT) on film formation behavior of Polystrene (PS) latex film was investigated by using steady state fluorescence technique. Films were prepared by mixing of pyrene (P)-labeled PS latex with different amounts of MWNTs varying in the range between 0 and 20 wt%. After drying MWNT containing films were separately annealed above glass transition temperature (T-g) of PS ranging from 100 to 270 degrees C for 10 min. In order to monitor film formation behavior of PS/MWNT composites Scattered light (I-s) and fluorescence intensities (I-P) from P were measured after each annealing step to monitor the stages of film formation. At 0-20 wt% range of MWNT content films minimum film formation (T-o) void closure (T-v) and healing (T-h) temperatures were determined. Void closure and interdiffusion stages were modeled and related activation energies were determined. It was observed that while void closure activation energies increased backbone activation energies decreased as the percent of MWNT is increased in the composite films. POLYM. COMPOS. 35:817-826 2014. (c) 2013 Society of Plastics Engineers
Citation Count: 2
Study of Film Formation From PS Latex/TiO2 Nanocomposites
(Wiley-Blackwell, 2014) Uğur, Saziye; Sunay, M. Selin; Pekcan, Önder
In this work we investigated the film formation from polystyrene (PS) latex/TiO2 nanocomposites using the steady state fluorescence (SSF) and UV-vis (UVV) techniques depending on PS particle size and TiO2 content. The structural properties of films were characterized by scanning electron microscope (SEM). The films were prepared from pyrene (P)-labeled PS particles (SmPS: 203 nm