Hafiz Usman Khalid

6 Questions 13 Answers 0 Followers

Questions related from Hafiz Usman Khalid

Why is there an electrochemical noise in Nyquist plot?

I got some dispersed data points during my EIS analysis. Can someone point out any specific reason for that? If there any referenced article related to it, kindly share. Because I have seen...

08 May 2021 5,721 4 View

Why is there a step transition between 80-100 deg C?

Can someone tell me whats the step transition before the final melting point of HDPE is telling us? Probably it's due to some additive, pigment, or some crystal formed during processing. I am...

08 May 2021 5,429 3 View

What is the reason of weight gain in TGA curve of a HDPE polymer sample ?

HDPE samples were aged at higher temperatures in the presence of water and CO2 than the TGA test was performed in Nitrogen? Weight gain is seen in the curve? What could be the possible reason for...

17 January 2021 5,843 2 View

What's the difference between dielectric loss and tangent loss ?

The real part of permittivity is dielectric constant ( ε՛ ) and a negative one is dielectric loss ( ε՛՛ ), while in some research articles they use tan δ as a dielectric loss. So which one do we...

13 January 2021 6,532 2 View

Can we relate Impedance to any dielectric property of polymer ?

I get the impedance values (real and imaginary parts) from the EIS technique. Can we correlate to it any dielectric property (dielectric loss, dielectric strength, or dielectric constant) using an...

14 December 2020 4,754 8 View

Glass transition temperature of Polyethylene ?

There are different values for Tg of PE in the literature. The values are (-78, -110, -125 deg C). Are these correct. As I ran a DSC for my HDPE sample (1mm and 3mm) and got this curve. As per my...

10 December 2020 2,961 11 View