It is notable that BPOB-5 has higher orientation than BPOB-1, which can be explained by the fact that hydrogen bonding between the BIA and cyclic imide
units restricts the flexibility of the polymer chain and the disorientation.
Overall, SMA imide
resins are versatile chemicals with intrinsic properties that can be used under diverse conditions.
1], which are commonly attributed to the asymmetrical and symmetrical stretching vibrations of carbonyl groups of imide
rings; absorption band at 1368 [cm.
The infrared vibrational frequencies of these polymellitimides revealed in four characteristic regions, as in the linear polyimides, because of the first imide
content is calculated from the ratio of imide
-related bands (1765 [cm.
The FT-IR spectra of copolymer CNPAM is shown absorption band of the C = C of imide
ring at 948[cm.
It helps us to monitor the decomposition (relationship between amide/imide
bonds) and the orientation (relationship between imide
bonds) after corona aging.
At low temperature range, during First scan, there was relaxation [gamma] correlated most probably with the phenyl or imide
rings motions strongly influenced by moisture absorption content .
9, which is denoted as arrows between backbone and side chain, and the precise position of the intrainteraction is located between the trail phenyl and the carbonyls in imide
rings of backbone.
as] C-O-C, 1114(br, m) imide
, 726(m) [delta] imide
IR (KBr): 3500-2500 (acid -OH), 1778 (imide
, symmetric C=O stretching), 1720 (acid C=O stretching and asymmetric imide
C=O stretching), 1377 (imide
ring vibration, axial), 1088 (imide
ring vibration, transverse) and 744 [cm.
However, both crosslinking routes shown in Scheme 1, are thermodynamically less favorable than imide