I am a DSC instrument user and trainer. I highly recommend this video, if you are about to use DSC for polymer studies. Neglect the video quality! believe me, it is worth it! Thank you for sharing this video!
I've been working with dsc for few years.. you got all the points there. It could saved me years of learning by experience if I get to watch this video earlier. Thank u.
I'm a little confused at around the 6 minute mark. Why would a polymer crystallize as you are heating it up? Don't thinks become more and more amorphous/fluid-like as you heat them up?
Thanks, but the crystallisation peak example was not very clear... Could you give an example? You said it goes from an amorphous to a semi-crystalling material with increasing temperature... Does this mean that when heat is applied to starch in its semi-crystalline structure, we will have an EXOthermic reaction??
Respected sir I have a DSC thermogram of maltose monohydrate having one endothermic peak just below the melting point. Can please explain what this peak indicate?
Let me ask, can i transform my result dsc in heat flow (W/g) and temperature to calculated about enthalphy of %cristanility? i have a problem because in my result i dont know about a mass change, please help me thank you
Question here: How come that the signal is recorded in units of energy per mass per degree per second [J/m°Cs=W/m°C] and we integrate that with respect to temperature [°C] we somehow end up with just energy per mass [J/m]?
This is very helpful. I come across with this video because I have some doubts. Would be possible to contact you to ask you some staffs? Thanks a lot in advance
very helpful vídeo. but what to do when we need to only use the first run? Due to acess the actual TG of a composite (to realise the degree of cure of a process) and in the first run we have a thermogram where is difficult to find the TG.
There are a couple of possible issues that I can think of, and probably several more that are not. If the degree of cure is too low, your Tg may be below your minimum temperature of the scan. If you have a high fiber/filler volume fraction, the Tg transition can appear pretty weak and you may need to play with your vertical scale. Finally, significant residual cure may obscure the Tg. It isn’t always nice and separated from the Tg like I show in the sketches. If you had a reference scan of a fully cured system and a completely uncured system, you could compare to those. TA instruments has a bunch of helpful tech and application notes on their website and if memory serves, one is on measuring degree of cure in the DSC. Hope one of those helps… Dr Robert E. Jones Professor Department of Mechanical Engineering (956) 665-5019 robert.jones@UTRGV.edu Brownsville • Edinburg • Harlingen
Hi there, yes TA tech tips are very helpful. If you have problems seeing a Tg, you can increase the heating rate, according to ASTM this may help. Also, you can use modulated DSC to separate the reversible heat flow associated with Tg.
I really appreciate your time, thank you. I think that in my case, it can be related with the high fiber volume of samples. Also, most of the times I cannot get a clean tansition, as there are several effects affecting the graph. There is no smooth line.. production department not always understands when we can not give them a temperature value as we can not read TG.
Hello. Dr Jones. Is there any data base about materials linked with their calorimetry? Currently, I am working to idenfify unknowledge materials using DSC techniques. Thank you in advance
Hi, you can can check the polymer handbook, which is a comprehensive database that gives information on mechanical properties, thermal properties, electrical properties, and chemical properties.
He was saying that the temperature of the glass transition increases if it is harder to move the molecules, because there is more energy needed for the transition. If the transition is at a lower temperature that means there is less energy needed for the transition.
I am a DSC instrument user and trainer. I highly recommend this video, if you are about to use DSC for polymer studies. Neglect the video quality! believe me, it is worth it!
Thank you for sharing this video!
Can i have more source to interpret the DSC data.
Thank you
This video is the reason I could quickly and easily understand DSC for my masters project, only lasting for 3 months. Saved my thesis, to be honest!
Excellent discussion on TGA and DSC fundamentals. Thanks a lot to Robert Jones !!!
I've been working with dsc for few years.. you got all the points there. It could saved me years of learning by experience if I get to watch this video earlier. Thank u.
Can I have more sources to interpret DSC data
This is very much helpful in learning DSC... This is really awesome video for beginners.
Great video! Regardless of the 3 frames per second framerate
Wow, probably one of the most useful lectures i've come cross. Thank you very much!
Hello can explain
Thank you so much ! That was like 2 hrs worth of 20 mins :D
My notes has become ever full and brimming with information. I think anyone watching this should do so while taking notes.
Such a nice lecture, it clears many doubts which were in my mind.
Very good video and make me get better understanding of DSC
Excellent and amazing teaching style...Thanks sir
very insightful.....!! Thank you
I'm a little confused at around the 6 minute mark. Why would a polymer crystallize as you are heating it up? Don't thinks become more and more amorphous/fluid-like as you heat them up?
Thank you, you covered the basic and important points for beginners.....
I etched this videos many times. Every time I learned domeo
Excellent explanation. Really helpful. 💯 ❤️
Hi Robert I have got very strange type of curves for Cashewnut shell phenolic resin. I could not find out curing temperature.
Thanks, but the crystallisation peak example was not very clear... Could you give an example?
You said it goes from an amorphous to a semi-crystalling material with increasing temperature... Does this mean that when heat is applied to starch in its semi-crystalline structure, we will have an EXOthermic reaction??
Respected sir
I have a DSC thermogram of maltose monohydrate having one
endothermic peak just below the melting point. Can please explain what this peak indicate?
Very informative!! Many thanks for such a valuable presentation.
why is the quality so good?
Would you please explain the differences between DTG and DTA?
Best teacher
Very good video. Thanks for the explanation Dr. Jones.
Sis kebap structure, what a creative term :) Great video, thanks a lot.
great video! super simple and clear!
Let me ask, can i transform my result dsc in heat flow (W/g) and temperature to calculated about enthalphy of %cristanility? i have a problem because in my result i dont know about a mass change, please help me thank you
Question here:
How come that the signal is recorded in units of energy per mass per degree per second [J/m°Cs=W/m°C] and we integrate that with respect to temperature [°C] we somehow end up with just energy per mass [J/m]?
Thanks a lot, it's a really helpful video
Thanks a lot for this…🤩
Is it heat release of the sample or net heat supply to the sample in the y-axis ?
this video was perfect! helped so much
This is very helpful. I come across with this video because I have some doubts. Would be possible to contact you to ask you some staffs? Thanks a lot in advance
Yes you can contact us at melearn.utrgv@gmail.com.
Thank you for the clear explanation.. Helped a lot
please can you explain the TGA analysis especially the weight loss of samples
very helpful vídeo. but what to do when we need to only use the first run? Due to acess the actual TG of a composite (to realise the degree of cure of a process) and in the first run we have a thermogram where is difficult to find the TG.
There are a couple of possible issues that I can think of, and probably several more that are not. If the degree of cure is too low, your Tg may be below your minimum temperature of the scan. If you have a high fiber/filler volume fraction, the Tg transition can appear pretty weak and you may need to play with your vertical scale. Finally, significant residual cure may obscure the Tg. It isn’t always nice and separated from the Tg like I show in the sketches. If you had a reference scan of a fully cured system and a completely uncured system, you could compare to those. TA instruments has a bunch of helpful tech and application notes on their website and if memory serves, one is on measuring degree of cure in the DSC.
Hope one of those helps…
Dr Robert E. Jones
Professor
Department of Mechanical Engineering
(956) 665-5019 robert.jones@UTRGV.edu
Brownsville • Edinburg • Harlingen
Hi there, yes TA tech tips are very helpful. If you have problems seeing a Tg, you can increase the heating rate, according to ASTM this may help.
Also, you can use modulated DSC to separate the reversible heat flow associated with Tg.
At our company we follow the ISO 11357. In this standard, heating rate defined is 20 K/min.
I really appreciate your time, thank you. I think that in my case, it can be related with the high fiber volume of samples. Also, most of the times I cannot get a clean tansition, as there are several effects affecting the graph. There is no smooth line.. production department not always understands when we can not give them a temperature value as we can not read TG.
Awesome Sir, it helped a lot
Hello. Dr Jones.
Is there any data base about materials linked with their calorimetry?
Currently, I am working to idenfify unknowledge materials using DSC techniques.
Thank you in advance
Hi, you can can check the polymer handbook, which is a comprehensive database that gives information on mechanical properties, thermal properties, electrical properties, and chemical properties.
Excellent video
03:22
Isnt that the other way around? Mobility of molecules increases with higher temp rather than decreases?
He was saying that the temperature of the glass transition increases if it is harder to move the molecules, because there is more energy needed for the transition. If the transition is at a lower temperature that means there is less energy needed for the transition.
Excellent tutorial! Thanks for your help
great video
thank you
Excellent
You helped a lot. Thanks
great presentation
amazing, thank you so much
//Can exothermic peak denote melting point?? please help
Good explanation
good video
amazing
thanks alot
Teacher you have a DSC in French!!
very nice
Jones Jason Clark Michael Thomas Jeffrey
Definitely not deep stone crypt... move along.