Skip to main content
User Image

ضيف الله بن محمد بن ضيف الله الضعيان

Associate Professor

مقرر لجنة الخطط ومصادر التعلم - مقرر لجنة معادلة المقررات - مقرر لجنة التوعية بالكلية - عضو لجنة الخطط بالكلية - عضو اللجنة العليا بالقسم

كلية العلوم
2أ 148 م5
publication
Journal Article
2021

Investigation of the dynamics of the various relaxation processes in SEBS block copolymer possessing low styrene fraction

Mohammadya, Sayed Z. . 2021

We constructed entire master curve exhibiting all probable relaxation processes in styrene ethylene butylene styrene, SEBS, block copolymer from isothermal shear compliance measurements. Measurements have been performed in steps depending on the velocity of the process investigated in the temperature region −60 to 160 °C. The frequency domain used is from 0.03 to 30 Hz. We applied the principle of time–temperature superposition, while taking in consideration the mismatch between activation responses of the two phases as a function of temperature. The styrene content in the sample is 13% by weight imposing another difficulty in investigating the polystyrene component. The resultant master curve was resolved into the contributing relaxation processes. The dynamics of the ethylene butylene, EB, and polystyrene, PS, relaxation processes are treated in the frame of the meander model of polymers in comparison to those observed in particular homopolymers.

Volume Number
Issue 4
Issue Number
Volume 25
Magazine \ Newspaper
Journal of Saudi Chemical Society
Pages
1-7
more of publication
publications

We have demonstrated a facile hydrothermal approach to synthesize a novel typeof mesoporous TiO2material with highly controllable structure. By regulating thesynthetic conditions, the mesoporous…

by Kun Lan,, Dongyuan Zhao, Wei Zhang, Zaiwang Zhao, Ahmed Elzatahry,, Yongyao Xia, Dhaifallah Al-Dhayan, Xingmiao Zhang, Ruicong Wang, Yao Liu
2018
publications

N-doped mesoporous carbon materials are greatly useful in adsorption, catalysis and energy storage. Controlled synthesis of such materials with both high nitrogen content and desired pore…

by Wei Teng, Dongyuan Zhao, Yang Liu, Wei Li, Daifallah Al-Dahyan, Yonghui Deng, Ahmed Elzatahry, Zhengren Wang, Jinxiu Wang, Hongwei Zhu
2018
publications

We constructed entire master curve exhibiting all probable relaxation processes in styrene ethylene butylene styrene…

by Sayed Z. Mohammadya, Daifallah M. Aldhayan
2021