Effect of annealing at temperature around glass transition temperature on molecular orientation and shrinkage of ethylene–vinyl alcohol copolymers
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説明
The effect of annealing on the molecular arrangement of ethylene–vinyl alcohol copolymers (EVA) was studied by optical methods. Drawn samples were annealed at temperatures near the glass transition temperature Tg in two cases; the first case allowed thermal shrinkage and the second case did not. For annealing below Tg, the hydroxyl groups were rearranged only to the stable position. Thermal shrinkage occurred by annealing at temperatures between Tg and Tg + 20–30 K. In the case of annealing at temperatures above Tg + 30 K, thermal shrinkage and crystallization occurred. The crystallization by annealing made the drawn sample difficult to shrink.
収録刊行物
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- Journal of Applied Polymer Science
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Journal of Applied Polymer Science 24 2277-2287, 1979-12-01
Wiley