Question

Poly(etherimide) is a strong, stiff and amorphous polymer with a T_g of 218 °C and no true T_m, showing a gradual softening till it melts at higher temperature. During machining, the polymer showed deformation. Select the most likely reason for the deformation.

		None of the given.
		The friction between the machine metal and plastic raises temperature and causes temperature to rise above Tg causing deformation.
		The polymer decomposes and degrades before softening.
		It is the wrong choice of polymer for machining at room temperature.

Answer 1

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