Which of the following polymers have the lowest coefficient of thermal expansion?
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A.
Network polymers
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B.
Thermoplastic polymers
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C.
Linear polymers
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D.
Branched polymers
Correct Answer:
A. Network polymers
Explanation:
Network polymers typically exhibit the lowest coefficient of thermal expansion among the various polymer types. This is because they possess a three-dimensional network of strong covalent bonds that cross-link the molecular chains, significantly restricting their mobility and vibration when heated. In contrast, linear, branched, and thermoplastic polymers rely more on weaker secondary intermolecular forces, which allow for greater chain movement and higher expansion rates as temperature increases. Stronger internal bonding directly correlates to greater dimensional stability and a lower expansion coefficient.
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