How about doing MTech in applied chemistry (polymer science and technology) at Delhi Technological University with UG in BTech plastics tech
Yes, it will be good as DTU is one of the best colleges of Delhi.
Some students have explained about DTU's mtech here: https://www.quora.com/Is-DTU-Delhi-Technological-University-good-for-doing-M-Tech-in-Biomedical-Engineering
Hope this helps you!