Journal of Polymer Science Part B: Polymer Physics, Vol.56, No.1, 53-61, 2018
Thickness dependence of structural relaxation in spin-cast polynorbornene films with high glass transition temperatures (> 613K)
The isothermal structural relaxation (densification) of a family of glassy polynorbornene films with high glass transition temperatures (T-g>613K) is assessed via spectroscopic ellipsometry. Three polymers were examined: poly(butylnorbornene) (BuNB), poly(hydroxyhexafluoroisopropyl norbornene) (HFANB), and their random copolymer, BuNB-r-HFANB. The effective aging rate, (T), of thick (approximate to 1.2m) spun cast films of BuNB-r-HFANB is approximately 10(-3) over a wide temperature window (0.49