[HAG]

I have to calculate the cristallinity of a polyethylene/starch blend. I used a DSC to measure the amount of heat that was emitted during crystallization. In order to calculate the crystallibity of my blend, I have to divide this amount of heat by the amount of heat emitted by the crystallization of 100% polyethylene, is this correct? If so, how can I find/calculate the heat emitted during crystallization of 100% polyethylene?


Sorry but my English isn't perfect

[ARGOS++]

Dear HAG;

Maybe that these are already of some help to you?:
           http://www.engr.utk.edu/mse/pages/Textiles/Polymer%20Crystallinity.htm
           http://www.tainstruments.co.jp/application/pdf/Thermal_Library/Applications_Briefs/TA123.PDF

Otherwise search the Net for: "polymer crystallinity DSC"

Good Luck!
                    ARGOS⁺⁺

[HAG]

Thanks!

I'm starting to get it! I will have to divide the heat given during crystallization by 293g/J (other sources give the same amount). To make sure, I added an attachment of a DSC of one of my materials. The heat during crystallization is 38,7 g/J.

=> 38,7/293 = 0,13 => 13%


Purple is the first heating, black cooling, green second heating

[ARGOS++]

Dear HAG;

the heat given during crystallization by 293g/J .  The heat during crystallization is 38,7 g/J.

I believe you mean: 38.7 J/g! - and also 293 J/g!
Then the results seems to make sense.

Good Luck!
                    ARGOS⁺⁺

[HAG]

Ok, thanks for the *delete me*

[ARGOS++]

Dear HAG;

You 're welcome!   ─   Soon again.

Good Luck!
                    ARGOS⁺⁺