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The glass transition temperature of a linear polymer with number average molecular weight MN =2300 was...

The glass transition temperature of a linear polymer with number average molecular weight MN =2300 was measured at 120°C. This increased to 155°C for the same linear polymer with MN =9000. A branched version of this polymer with MN =7200 was found to have a Tg=105°C. Calculate the average number of branches per molecule in this branched polymer.

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