I have to find the crystallization fraction from the DSC plot. It is calculated by At/A where A is area under exotherm (crystallization peak) from (Ti) Temp of initiation of crystallization to T
and A is total area of crystallization peak.
So which area should be considered and how can the fraction be obtained??
Hi Rishi... for such specific applications, the operating conditions of the DSC instrument play essential role. The heating rate is a major factor. The sample needs to be homogenated thoroughly before the run to make sure that the signal really represents the thermal behavior. At low heating rates the resolution of the peaks will be high and thus, the starting temperature of the change will be clearly resolved. The exact boundaries of the peak can be confirmed by running the cooling curve. As I may see, the temperature for the end of the peak should be higher than that given in your DSC curves. Please check the attachment.
thankyou so much Mahmood M. Barbooti sir :)
So i will consider only that one specific peak area.
Regards,
Rishi Naik
Dear Rishi Naik
The degree of crystallinity (Xc) for each material was also determined from the following equation
Xc(%)= ∆Hf /∆Hf* ×100
where ΔHf is the enthalpy of fusion of a sample and ΔHf * is the theoretical enthalpy of fusion for a 100% crystalline polymer.
When you calculate the area mentioned by Mahmood M. Barbooti , you should multiply the value to 1/(rate of heating) and also the weight of total sample to change its unit.
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