Abstract
Polynorbornene (PNB) or cyclo olefin copolymer (COC) can undergo conformational conversion into the more stable T(T)G conformer from T(T)T and G(T)G. The conversion constitutes the nascent stage for the reordering process of the COC. Interconversion between two major chain conformers leads to two groups of 13C NMR resonances corresponding to the CH carbon in the norbornene chain at 53ppm (T(T)T+G(T)G) and 49ppm (T(T)G). Chain reordering following the conversion leads to the condensation of the COC bulk and raises its Tg, substantially. The presence of random PE segment not only improves its segmental motion but also facilitates the conversion into the most stable T(T)G conformation.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
