New low-band gap polyurethanes containing azomethine bonding: Photophysical, electrochemical, thermal and morphological properties

Kamacı, Musa; Kaya, İsmet

doi:10.1016/j.jtice.2015.08.018

Cited by 22 publications

(11 citation statements)

References 41 publications

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“…These results clearly indicates that poly(azomethine‐imide)s bearing m‐ substituted aldehyde have higher than p‐ substituted aldehyde. It could be concluded properties of polymers that the presence of substitute azomethine (CN) linkage in the structure of polyimides were gained to higher thermal stability these polymers . As can be seen in Figure , the polymers have been generally showed two T g and loss modulus peaks in DMA curves.…”

Section: Resultsmentioning

confidence: 85%

“…It could be concluded properties of polymers that the presence of substitute azomethine ( C N) linkage in the structure of polyimides were gained to higher thermal stability these polymers. 29,30 As can be seen in Figure 7, the polymers have been generally showed two Tg and loss modulus peaks in DMA curves. Tan δ and loss modulus peaks at low temperature were attributed to the stiff glassy properties of the poly(azomethine-imide)s and at high peaks were associated with decomposition of the hydrogen bonding via Van der Waal's forces.…”

Section: Reflectance Spectra Of Poly(azomethine-imide)smentioning

confidence: 79%

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Poly(azomethine‐imide)s containing siloxane moities: Optical, thermal, mechanical, and morphological properties

Kaya

Kamacı

2019

J of Applied Polymer Sci

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A new series of poly(azomethine‐imide)s having siloxane moities in backbone was prepared using different dianhydrides.Thermal, optical, and morphological properties of these polymers were clarified. Also, bulky CO and CF3 group effects and meta or para‐substituted aldeyhde effects on the mentioned properties were evaluated. The structural characterization of poly(azomethine‐imide)s was carried out using a FT‐IR spectroscopy. The optical properties of the polymers were performed via an UV–Vis spectrophotometer. Optical band gap of the poly(imide)s containing azomethine was calculated between 2.20 and 2.33 eV. Thermal behavior of poly(azomethine‐imide)s was also studied using TG‐DTA, DSC, and DMA techniques. The onset degradation temperature and percentage char values of the polyimides were found in the range from 429 to 545 °C and 22 to 35%, respectively. Thermal stability results demonstrated that benzophenone bearing poly(azomethine‐imide)s have higher onset temperature, percentage char, and the glass transition temperature than poly(azomethine‐imide)s derived from hexafluoroisopropylidene. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48364.

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Section: Resultsmentioning

confidence: 85%

Section: Reflectance Spectra Of Poly(azomethine-imide)smentioning

confidence: 79%

Poly(azomethine‐imide)s containing siloxane moities: Optical, thermal, mechanical, and morphological properties

Kaya

Kamacı

2019

J of Applied Polymer Sci

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“…Rectangular samples of 10 mm (length) × 5.5 mm (width) × 0.6 mm (thickness) were used to conduct DMA tests in single cantilever bending mode at a frequency of 1 Hz, a heating rate of 3 °C min −1 , and in the range 20–350 °C. The sample was prepared as follows: 0.5 g of polyether imide was placed into the titanium clamp (supplied from Triton Technology Ltd., United Kingdom) and was extended followed by closing of the clamp from both sides …”

Section: Methodsmentioning

confidence: 99%

“…The sample was prepared as follows: 0.5 g of polyether imide was placed into the titanium clamp (supplied from Triton Technology Ltd., United Kingdom) and was extended followed by closing of the clamp from both sides. 26 Preparation of 4,4 0 -(((2,4,6-trimethyl-1,3phenylene)bis(methylene))bis(oxy))dianiline 4,4 0 -(((2,4,6-Trimethyl-1,3-phenylene)bis(methylene))bis(oxy))dianiline was abbreviated as PMA and it was prepared in two steps as follows:…”

Section: Optical Properties and Thermal Characterizationmentioning

confidence: 99%

Synthesis, optical, and thermal properties of polyimides containing flexible ether linkage

Kaya

Kamacı

2018

J of Applied Polymer Sci

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The goal of this article was to synthesize a series of flexible polyimides containing ether linkage in main chain and clarified the effect of this ether linkage on some physical properties such as optical and thermal decomposition. Also, different functional group effects such as carbonyl (CO), hexa‐fluoro‐isopropylidene [C(CF3)2] and phenyl (C6H5) on these physical properties were evaluated. The structural characterization of poly(ether imide)s was performed using Fourier transform infrared, 1H‐nuclear magnetic resonance (NMR), and 13C‐NMR techniques. Optical band gap of polyimides was calculated in the range from 2.57 to 2.81 eV. Thermal characterization of poly(ether imide)s was carried out using thermogravimetry–differential thermal analysis and differential scanning calorimetry. Thermal stability of poly(ether imide)s was evaluated by initial decomposition temperature (Ton) and char. Ton value of polymers was determined in the range from 100 to 195 °C. In addition, glass transition temperatures of poly(ether imide)s were found between 144 and 148 °C. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46573.

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“…Generally, the azomethine group is formed by condensation between amine and aldehyde. Kaya and co-workers studied its optical and electrical applications by introducing azomethine into a urethane backbone; however, they did not consider self-healing of azomethine-based PUs [ 28 , 29 , 30 ]. Jie and co-worker synthesized polyazomethine and confirmed its self-healing properties via the exchange reaction of imine groups, imine metathesis [ 31 ].…”

Section: Introductionmentioning

confidence: 99%

Design of Azomethine Diols for Efficient Self-Healing of Strong Polyurethane Elastomers

Lee

Kim

2018

Molecules

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Azomethine diols (AMDs) were synthesized by condensation between a terephthalic aldehyde, polyether diamine, and ethanol amine. The synthesized AMDs were employed to introduce azomethine groups into the backbones of polyurethane elastomers (PUEs). Different AMDs were designed to control the concentration and distribution of azomethine groups in PUEs. In this study, we explored the intrinsic self-healing of AMD-based PUEs by azomethine metathesis. Particularly, the effects of the concentration and distribution of the azomethine groups on the AMD-based PUEs were considered. Consequently, as the azomethine group concentration increased and the distribution became denser, the self-healing properties improved. With AMD3-40, the self-healing efficiency reached 86% at 130 °C after 30 min. This represents a 150% improvement over the control PUE. Additionally, as the AMD content increased, the mechanical properties improved. With AMD3-40, the tensile strength reached 50 MPa. Therefore, we concluded that the self-healing and mechanical properties of PUEs can potentially be tailored for applications by adjusting the concentration and design of AMD structure for PUEs.

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New low-band gap polyurethanes containing azomethine bonding: Photophysical, electrochemical, thermal and morphological properties

Cited by 22 publications

References 41 publications

Poly(azomethine‐imide)s containing siloxane moities: Optical, thermal, mechanical, and morphological properties

Poly(azomethine‐imide)s containing siloxane moities: Optical, thermal, mechanical, and morphological properties

Synthesis, optical, and thermal properties of polyimides containing flexible ether linkage

Design of Azomethine Diols for Efficient Self-Healing of Strong Polyurethane Elastomers

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