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Glass Transition

glass transition molecular weight polymers

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#1 Kmfood

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Posted 08 April 2019 - 03:05 PM

Hello everyone, 

 

So I just wanted a little more clarity on glass transitions temperatures, specifically what would cause a glass transition temperature of one polymer to be greater than another polymer. I understand that the higher a polymers molecular weight is the greater the Tg value is, but I was wondering if there were any other reasons for the glass transition to be greater?



#2 latexman

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Posted 08 April 2019 - 03:20 PM   Best Answer

Branching causes entanglement which affects Tg.  Different groups in the polymer backbone are stiffer than others (intermolecular forces).  Cross-linking affects Tg greatly.  Plasticizers lower Tg.  There may be others.






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