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1. Which one of the following has the lowest Tg? H H нн нн м dooсн) H CH3 H H CI. (b) Polymethyl methacrylate (PMMA) (d) Poly
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Answer #1

Solution:

1) Polypropylene

Polypropylene has lowest glass transition temperature (Tg) around -20 °C to 0°C due to its softness.

Other polymers has higher glass transition temperature due to their hardness.

2) Polystyrene

It has highest glass temperature of 95 °C. These polymers are hard and hence has higher Tg value.

Other polymers are softer than polystyrene.

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