Measurement of glass transition temperature(T_g) change was carried out using the MD simulation.First,MD dynamics was performed to find the relationship between computed solubility parameters and repeating unit of trans-1,4-polysoprene.It is reasonable that choosing 20 repeating units of the polymer to calculate the glass trasition temperature for Guatta-Percha.Then,MD simulation was performed to calculate the relationship between specific volume and temperature of trans-1,4-polysoprene.Results show that th...