For PAMAM dendrimer and PEI, the imide
ring was opened because of the reaction with primary amine groups, and crosslinked structure was formed.
content increases upon heating and shows a maximum value of 29% for SMI-1 or 37% for SMI-2 at 135[degrees]C.
Overall, SMA imide
resins are versatile chemicals with intrinsic properties that can be used under diverse conditions.
g]s with increasing BIA/ODA molar ratio, which is in accordance with the increased hydrogen bonded imide
It helps us to monitor the decomposition (relationship between amide/imide
bonds) and the orientation (relationship between imide
bonds) after corona aging.
1], which are commonly attributed to the asymmetrical and symmetrical stretching vibrations of carbonyl groups of imide
rings; absorption band at 1368 [cm.
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 .
0, and moreover, establish relationship of draw ratios and formation of the interaction, we have calculated ratio value, defined as distance of two adjacent imide
rings to draw ratio, as shown in Table 2 and Fig.
as] C-O-C, 1112(br, m) imide
, 723(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.
The suggested reaction products can be transformed into an imide
There are two fundamental reasons for the drop in the cyclization rate constant of solid polyamic acids: the change in amic acid group reactivity as a result of decreasing molecular mobility when the imide
ring content increases, and the existence of various kinetically nonequivalent states of amic acid groups and the statistical distribution of these groups over these states (6, 7).