Question

Branching in the polymerization process tends to increase the level of crystallinity in a polymer.   True  ...

Branching in the polymerization process tends to increase the level of crystallinity in a polymer.   True   or   False.

The Heat Deflection Temperature (HDT) of a glassy or amorphous polymer is usually found far below (i.e., > 50 C below) the glass transition temperature.   False or   True.   

Engineering   Chemical-Engineering   
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Answer #1

1) True: Branching makes the polymers more crystalline. This is because the polymers are not allowed to freely move when there is lot of branching. This results in a highly restricted and ordered structure: the characteristics of crystalline materials

2) True: the HDT for a glassy or amorphous material is usually very low tha glass transition temperature. If the HDT is of the order of the glass transition temperature, then the material is not thermally stable. Since at Tg, the polymer will start to melt and flow leading to failure in the thermal application

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