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Why does branched isomers have lower melting and boiling points than the straight chained molecules?

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  • Why does branched isomers have lower melting and boiling points than the straight chained molecules?


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Answer #1 | 23/07 2014 13:12
The melting point of a material is proportional to the strength of intermolecular bonding. In this case straight chained molecules such as a variety of thermoplastic polymers do not have cross link bonding, therefore the molecule chains will flow viscously with increasing temperature as molecules become thermally excited. The branched isomer will have cross linking bonds keeping the material in solid state, once a certain temperature is reached these bonds will break; however the temperature necessary for this is greater than the temperature required to melt a straight chained molecule due to aforementioned bonding present.
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Answer #2 | 23/07 2014 13:10
simple explaination; smaller surface area and fewer intermolecular interactions

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