Discussion
Assertion (A): Processing conditions affect the colour of a pigmented plastic.
Reason (R): Dispersion of the pigment changes with shear and temperature during processing.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. The colour of a pigmented plastic depends on how finely and evenly the pigment is dispersed, and dispersion is achieved by shear and heat during compounding and moulding. Change the screw speed, the temperature or the residence time and the same formulation gives a different colour.
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