ryansiva
Ryan Siva   Sydney, New South Wales, Australia
 
 
The syntehtic polymer polthylene can be manufactured in two forms. One form, called HDPE ( high density polyethlene ) , has long lenear chains of CH2 groups with an average molecular weight of 3, 000,000. Another form, calleed LDPE ( low density polyethelene ), has branched chains and average molecular weight of 1000000. Explain why the melting point of HDPE ( 135 C) is higher than them elting point of LDPE ( 80 C )
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Cubert 28 Jul, 2019 @ 11:47pm 
Well, it's quite obvious, isn't it? HDPE has long, linear chains (given), while LDP has shorter chains. The relationship between hydrocarbon length and boiling point is directly related to surface area, which is influenced by Van der Waals or intermolecular forces. As the chain is increased in length, the surface area increases (for obvious reasons) and so does the amount and strength of the Van der Waals. So HDPE, being the hydrocarbon with longer chains, will have more intermolecular forces and therefore a higher boiling point.
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