What is the reason to disappear the Tg and the crystallization pick from the second heating run when the cooling rate below 10C/min ?

My polymer is PLA and I follow the following steps (DSC 25): first heating " rate 10 C/min- fixed at 200 C for 5 min"--> remove the thermal history cooling " rate 5 C/min - fixed for 2 min...

19 November 2018 3,806 3 View