GATE 2020 (XE-F) Polymer Science & Engineering Solution (Part-II) 

are pandey jiii

Hi Sachin, you are correct that n is the number of C-C bond but the structure you are using to determine number of C-C bond is not correct. The structure of polymer chain is C-C-C-C-C-C-C-C......... Cn. Now if you just take 3 monomer unit containing 6 C atoms, C-C-C-C-C-C, you can see there is 5 C-C bond instead of 3, so for a small chain number of bond will be (2n-1) for very long chain, we can just consider, number of bond = 2n. I hope it help.

Most welcome 😊

Thanks for watching.

There is a typo in the slide.... the radius value will be 2x10^-3 m. The answer is correct.

Question 19 is from rheology.

I think final selection depends on both score and interview so someone appearing in polymer science will give better interview for polymer branch then students from any other branch. Also by choosing to appear in polymer science indicate that you are much more interested in pursuing this field rather than a last minute thought or forced to chose because not getting admission in the other field. In general, I will say everything has some merits and some demerits either at early stage or later stage so it is better to pursue what you like and don't worry about other things.

@@PolymerWorld thankyou so much. I'll definitely keep this in mind

Here is a list of books that will help you to prepare for GATE Principles of polymerization by ODIAN Plastics Materials and Processing by A. B. Strong Polymer Science and Technology by Robert O. Ebewele Introduction to Polymer Science and Chemistry: for Numerical based questions by Manas Chandra

@@PolymerWorld thankyou so much ...it shall help me a lot .♥️

@@PolymerWorld thank you so much ma'am for your all time mentoring...!!!🙏

For polymers like Nylon 66 whose repeat units consist of two monomeric units, the molecular weight of the repeat units must be half of the molecular weight of the repeat units. It is more of an experimental fact than a theoretical calculation. If you want to learn more please consult books like Principle of Polymerization by Odian, Polymer Science and Technology by Robert O. Ebewele.

If there are three monomer then what will happen

Why n is multiply by 2 in ques 16

You can consult Polymer Science and Technology by Robert O. Ebewele. It doesn't cover complete GATE syllabus but covers many of the GATE topics.

You can consult Polymer Science and Technology by Robert O. Ebewele. It doesn't cover complete GATE syllabus but covers many of the GATE topics.