Ionic conductivity of PVdF-co-HFP/LiClO4 in terms of free volume defects probed by positron annihilation lifetime spectroscopy

U Yahsi, H Deligöz, C Tav, K Ulutaş… - Radiation Effects and …, 2019 - Taylor & Francis
Polymers based on ionic conducting materials have important interest because of their
potential applications in polymer electrolytes and membranes for fuel cell application. PVdF …

[HTML][HTML] Relaxation time of polypropylene glycol and polypropylene glycol dimethylether-like polymers in terms of fluid-phase temperature and pressure dependent …

U Yahsi, B Coskun, A Yumak, K Boubaker… - European Polymer …, 2015 - Elsevier
We present a model explaining relaxation time of PPG (polypropylene glycol) and PPGM
(polypropylene glycol dimethylether) as representative compounds, with different molecular …

[HTML][HTML] Free-volume analysis of the structural and dielectric properties of PMMA/TeO2 composites via positron annihilation lifetime spectroscopy

S Kuzeci, E Ozcan, AU Kaya, R Bakar, C Tav… - Journal of Alloys and …, 2024 - Elsevier
PMMA (Poly methyl methacrylate) composites have promising potential for applications in
optics and dielectric energy storage. To investigate the effects of TeO 2 contents in PMMA in …

Effect of free volume on curcumin release from various polymer-based composite films analyzed using positron annihilation lifetime spectroscopy

JW Rhim, S Kuzeci, S Roy, N Akti, C Tav, U Yahsi - Materials, 2021 - mdpi.com
This work reports the effects of free volume on curcumin release in various polymer-based
composite films. Curcumin-reinforced biocomposite films were fabricated with natural …

On the ionic conductivity of polymer electrolytes in terms of hole fraction

U Yahsi, K Ulutas, C Tav… - Journal of Polymer Science …, 2008 - Wiley Online Library
A theoretical model to interpret the conductivity of ions through polymer electrolytes is
established in terms of the temperature and pressure‐dependent hole fraction computed …

[HTML][HTML] The effect of hole fraction on viscosity in atactic and syndiotactic polystyrenes

F Sahin-Dinc, A Sorrentino, C Tav, U Yahsi - International Journal of …, 2015 - Springer
The non-Newtonian viscosity behavior of atactic and syndiotactic polystyrenes (aPS and
sPS), at temperatures from 200^ ∘ C 200∘ C to 300^ ∘ C 300∘ C and pressures up to 30 …

On the non‐newtonian viscous behavior of polymer melts in terms of temperature and pressure‐dependent hole fraction

FS Dinc, T Sedlacek, C Tav… - Journal of Applied …, 2014 - Wiley Online Library
ABSTRACT A new theoretical non‐Newtonian viscosity model is developed by taking the
fractional series expansion of Eyring's shearing strain rate. A broad range of experimental …

Free volume vacancy behaviour and dynamic viscosity of diesel fuels with additives at elevated temperature and pressure: thermo-occupancy function

F Sahin-Dinc, C Schaschke… - International Journal of …, 2022 - inderscienceonline.com
The reported pressure-volume-temperature (PVT) data of five different diesel fuels at T=
297.95-373.06 K and P= 0.1-457.2 MPa were described by the Simha-Somcynsky (SS) …

Viscous behavior of PS, PP, and ABS in terms of temperature and pressure‐dependent hole fraction

G Akdeniz, U Yahsi, C Tav - Journal of applied polymer science, 2010 - Wiley Online Library
We have developed a zero‐shear viscous model in terms of temperature‐and pressure‐
dependent hole fraction computed from Simha‐Somcynsky Hole Theory. This model …

Hole fraction dependence on linear viscosity of PS, PP and ABS

F Sahin-Dinc - International Polymer Processing, 2015 - degruyter.com
A linear dependency of zero shear, constant shear-rate and constant shear-stress viscosities
with temperature and hole fraction (“thermo-occupancy” function) was derived for …