Search results for query: *

Hi all, I have been given two polymer samples and the only difference between the two is one contains food colouring and one does not. My understanding is that the food colouring would colour the sample and that is all! The sample without food colouring quickly dissolves in THF but the sample...

Hi all, I have ran some samples on the DMA and at a frequency of 1Hz I get a really noisy signal, why is this? Is it something to do with resonance? Thanks in advance for your help!

Hello What type of things could cause hysteresis in DSC Scans?

Yes, I did mean 50C per min! Thank you very much for your responses - having no good text book on the subject and no one in the lab to ask I find it difficult to find information! What other things could cause the peaks to shift? I'm also finding it difficult to find information on what is...

Hi, I've ran a polymer same on the DSC at 5 different temperature and the intensity and position of the peak has changed as a function of heating rate. I.E The melting point peak is at a higher temperature and more intense at a heating rate of 50C than at 30C or 20C. I've read this is due to...

Hi all, My understanding of the storage modulus is it gradually drops off as the sample is heated due to increasing molecular motions within the material, the main chain movements being seen at the glass transition temperature. I just ran a polyurethane sample and there is a peak in the storage...

So the Loss Modulus is a measure of a materails ability to dissipate heat, but what is happening in the material as it goes through the Tg transition? The graph I have shows the loss modulus increasing to a peak around -30C and then dropping back down. Is the energy "lost" to internal motions...

Hi all, I've just been handed a data summary from a DMA test. I'm trying to find help interpreting a "loss modulus" curve. I know that the Tg can be taken from the peak in the Loss Modulus but I want to understand what is happening in the material to cause this peak? Thanks in advance for...

Is it possible to determine a value for Young's modulus from a material's storage modulus? I have ran a number of tests using DMA in compression mode and have the data but I'm not should which point I should take as Young's modulus. Would it be the point of inflection of the curve for a plot...