Sreenath Pappuru

4 Questions 46 Answers 0 Followers

Questions related from Sreenath Pappuru

TGA two step degradation?

Hi, In my nearly alternate copolymer which has epoxide and anhydride as co monomers, I am observing two step degradation. First step occurring approximately between 100 and 300 oC followed by the...

24 October 2016 5,256 10 View

In proton NMR 400Mz but Carbon NMR 100 Mz what is the reason?

It can be explained only from Gyromagnetic values or any other reason?Please suggest?? Thank you in Advance!

27 June 2016 4,692 6 View

Difference between Normal 13C NMR and Inverse-Gated (IG) 13C NMR spectrum?

I am characterizing one complicated 13C NMR, which has more CH-, CH2-, and CH3- signals in the aliphatic region. I heard Inverse-Gated (IG) 13C NMR will give good information regarding this case....

10 June 2016 4,590 8 View

Why two Tg (glass transition temperature) in DSC (differential scanning calorimetry)?

I prepared co-polymer from propylene oxide and L-Lactide with Mn = 33.21Kg/mol and PDI = 1.44. When I recorded DSC (10o C/min) I am getting two Tg transitions (-17 oC and 8 oC). What could be the...

08 June 2016 8,413 10 View