Cellulose acetate has very high film permeability among all the polymers of the order of 5000 gm/100 m2. Which of the following polymers has the maximum film elongation (of the order of 100%) ?
Correct answer: D. Polythene
- A. Water impermeable cellophane
- B. Teflon
- C. Cellulose acetate
- D. Polythene
Explanation
Polythene films can stretch to roughly 100% elongation because the flexible polymer chains uncoil and orient under tension. Cellulose acetate and Teflon films are generally much less extensible, while water-impermeable cellophane is brittle.
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