Premium
Molecular design and synthesis of crosslinked polyimides using radical isomerization of vinylcyclopropane with thiols
Author(s) -
Okamoto Shusuke,
Sudo Atsushi,
Endo Takeshi
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.50529
Subject(s) - moiety , polymer chemistry , differential scanning calorimetry , isomerization , polymer , glass transition , polyimide , materials science , diamine , dithiol , chemistry , organic chemistry , layer (electronics) , composite material , catalysis , physics , thermodynamics
Reactive polyimides bearing a vinylcyclopropane (VCP) moiety in the main chain were successfully synthesized from the corresponding diamine with the VCP moiety. Their radical crosslinking using a dithiol proceeded with the radical ring‐opening reaction (RROR) of the VCP moiety to afford the corresponding crosslinked polyimides with the CC bonds in crosslinking moieties. Thermal properties of those crosslinked polyimides were evaluated by thermal gravimetry and differential scanning calorimetry. As a result, the increase of the crosslinking degree in the crosslinked polymer exhibited great residual weight at 600°C. In contrast, the tendency of the glass transition temperature was inverse because the increase in the amount of dithiol unit as a crosslinker would enhance the mitigation of the polymer packing structure and activates the mobility of polymer chains.