الفهرس 
CHAPTER 1: INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 134 |  |  |
| | | from | 134 | | |
Abstract
1. Polymer electrolyte membranes (PEMs) for fuel cells, also termed as proton exchange membranes, have been successfully prepared by UV -radiation grafting of styrene onto PET films and consequent selective sulfonation by chlorosulfonic acid.
2. The PEMs displayed excellent thermal, mechanical and electrical properties.
maxImum ion-exchange capacity (lEe) and the proton conductivity of the PEM were measured to be O.7mmol g-l and 58 m Scm respectively.
4. The activation energy was calculated as 6 k jmor1 by Arrhenius plot which reveals that the vehicle mechanism is the predominant conduction mechanism in PETPSSa membranes.
5. PET membranes with D.G ranging from 8 to 166 % have shown free volume hole size (65- 96) A03.The obtained values are found to be lower.