n A rule of thumb stating that the ratio of polymer’s glass-transition temperature to its melting temperature (Tg/Tm), both in Kelvin, usually lies between 0.5 and 0.7. For symmetrical polymers, such as polyethylene, it is close to 0.5; for unsymmetrical ones, such as polystyrene and polyisoprene, it is near 0.7.
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Gooch, J.W. (2011). Boyer-Beaman Rule. In: Gooch, J.W. (eds) Encyclopedic Dictionary of Polymers. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-6247-8_1539
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