1. Department of Chemical Engineering; King Fahd University of Petroleum Minerals; Dhahran 31261 Saudi Arabia
2. Department of Petroleum Engineering and Center of Petroleum & Minerals; King Fahd University of Petroleum and Minerals; Dhahran 31261 Saudi Arabia
3. Polymer Research Institute, State Key Laboratory of Polymer Materials Engineering; Sichuan University; Chengdu 610065 P. R. China