Effect of Barium Titanate on the Thermal, Morphology, Surface, and Mechanical Properties of the Thermoplastic Polyurethane/Barium Titanate Composites

Optical, Structural, and Dielectric Properties of Composites Based on Thermoplastic Polymers of the Polyolefin and Polyurethane Type and BaTiO3 Nanoparticles

“…According to the studies reported thus far, the IR band of bending vibrational modes of N-H can be observed at 816 cm −1 , while the absorption bands from 1000-1150, 1202, 1597, and 3100-3600 cm −1 are attributed to the vibrational modes of stretching C(O)-OC, CO stretching in the ether group, C-C + C=C in the benzene ring, and the stretching vibrational modes of the NH group, respectively [38][39][40]. The IR bands of 2853 and 2938 cm −1 are attributed to the anti-symmetrical and symmetrical vibrational modes of the CH bonds, respectively [41,42]. The absorption band located at 1701 cm −1 is assigned to the hydrogen-linked urethane carbonyl group (C=O) [43,44], while the free carbonyl vibration modes are attributed to the IR band located at 1730 cm −1 [41][42][43][44][45].…”

“…The IR bands of 2853 and 2938 cm −1 are attributed to the anti-symmetrical and symmetrical vibrational modes of the CH bonds, respectively [41,42]. The absorption band located at 1701 cm −1 is assigned to the hydrogen-linked urethane carbonyl group (C=O) [43,44], while the free carbonyl vibration modes are attributed to the IR band located at 1730 cm −1 [41][42][43][44][45]. Moreover, the IR band at 3300 cm −1 is associated with the NH group [45], which means that a partial inter-and intra-molecular hydrogen linkage of NH group is made between the adjacent urethane segments.…”

Effect of Particle Functionalization on Structural and Dielectric Properties of Flexible TPU/BaTiO3/MWCNTs Composite Films

“…It is well known that hydrogen bonding in polyurethanes is mainly attributed to the interactions of NH with the carbonyl groups in urethane groups of the hard segments (HS) or interactions with ether groups characteristic of the soft segments (SS). [ 16 ] The recorded spectra of pure TPU and the corresponding composites are shown in Figure . The spectrum of pure TPU showed an absorption band at 3325 cm −1 that was attributed to the hydrogen‐bonded NH stretching vibration in the urethane group.…”

“…The spectrum of pure TPU showed an absorption band at 3325 cm −1 that was attributed to the hydrogen‐bonded NH stretching vibration in the urethane group. [ 16 ] The strong absorption peaks positioned at 2916 and 2846 cm −1 were correlated to the asymmetrical and symmetrical vibrational modes in CH 2 groups, respectively. The absorption band at 1696 cm −1 was associated with the hydrogen‐bonded carbonyl group, while the peak at 1727 cm −1 was related to the free urethane carbonyl (CO) groups.…”

“…A possible explanation is that the addition of unfunctionalized BT promotes polymer‐polymer interaction and free volume reduction, thus initiating more intimate contact between the TPU macromolecules and resulting in restricted chain mobility. [ 16 ] In TPU/BT f /MWCNT f composite films, the T g1 values were almost constant with the increased content of functionalized BT, but significantly lower when compared to the T g1 values relevant for TPU/BT systems. Additionally, a slight decrease in the second T g2 values could be noted with the increase in BT loadings.…”