Poly(<i>N</i>‐vinylimidazole) based hydrogen bonded side chain liquid crystalline polymer

Gürsel, Yeşim Hepuzer; Şenkal, Bahire Filiz; Kandaz, Mehmet; Yakuphanoğlu, F.

doi:10.1002/pat.1848

Cited by 12 publications

(9 citation statements)

References 31 publications

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“…The peak heights of crystalline to nematic transitions are much higher than nematic to isotropic transitions. The correlation situation of the phase transition temperatures and peak heights to the heating rate was observed to be in line with the results reported in the literature [15][16][17]. One can see detailed comparison between the trends observed in the present study and the tendencies identified in previous studies [15][16][17][18].…”

Section: Resultssupporting

confidence: 92%

“…Higher activation energy implies that the energy barrier for the nematic-isotropic phase transformation is higher than the energy barrier for the crystalline-nematic phase transformation. Similar results were reported in the literature [15][16][17] for phase transition activation energy of some liquid crystals. As seen in Figure 1.b, the peak phase transition temperatures grow as the heating rate rises from 5 o C/min to 20 o C/min.…”

Section: Resultssupporting

confidence: 91%

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Thermal properties of liquid crystal hexylbenzoic acid/octyloxybenzoic acid mixture

Okumuş

2015

AIP Conference Proceedings

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Abstract. The thermal behaviors of binary mixture formed from hydrogen bonded nematic liquid crystals 4-hexylbenzoic acid and 4-(octyloxy)benzoic acid, were investigated by differential scanning calorimetry (DSC). The phase transition temperatures and enthalpies were determined by using calorimetric methods on DSC. The DSC results clearly indicate that the produced liquid crystal mixture displays liquid crystalline properties. The phase transition temperature values increase with increasing heating rate between 5 ºC/min and 20 ºC/min, and the calculated activation energy values show that the reaction arising during the phase transitions of the mixture is regular.

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Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 91%

Thermal properties of liquid crystal hexylbenzoic acid/octyloxybenzoic acid mixture

Okumuş

2015

AIP Conference Proceedings

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“…So, the reaction arising during the phase transitions of 6BA/8OBA/ 10OBA liquid crystal mixture is regular. Similar experiments were reported in the literature [26][27][28] for phase transition activation energy of liquid crystals.…”

Section: Liquid Crystals 1297supporting

confidence: 86%

“…The correlation situation of the phase transition temperatures and peak strengths to the heating ratio was observed to be in line with the results reported in the literature. [26][27][28] By using the experimental results in Table 3, the phase transition activation energy for every phase transformation was calculated. In order to calculate the phase transition activation energies, Ozawa, [29] Kissinger [30] and Takhor [31] methods were used.…”

Section: Liquid Crystals 1297mentioning

confidence: 99%

Thermal and mesomorphic properties of ternary mixtures of some hydrogen-bonded liquid crystals

Okumuş

Özğan

2014

Liquid Crystals

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The thermal and mesophase behaviour of ternary mixtures formed from hydrogen-bonded nematic liquid crystals 4-hexylbenzoic acid, 4-(octyloxy)benzoic acid and 4-(decyloxy)benzoic acid were investigated by differential scanning calorimetry (DSC) and phases identified by polarised optic microscopy (POM). The DSC and POM results clearly indicate that the produced mixtures display liquid crystalline properties. The phase transition temperature values obtained in the DSC experiments are in line with the POM observations. Investigation of the thermal properties of ternary mixtures reveals that the nematic range of the produced mixtures is affected in a way that is dependent on both the mixture ratio and the difference in the alkyloxy chain lengths. Furthermore, the phase transition temperature values of ternary mixture increase with increasing heating rate, and the calculated activation energy values show that the reaction arising during the phase transitions of the mixture is regular.

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“…Its partially ionized amino groups might bind to the deprotonated carboxylic acid groups of alginate (see Fig. for comparison) …”

Section: Discussionmentioning

confidence: 99%

Alkaline poly(ethylene glycol)‐based hydrogels for a potential use as bioactive wound dressings

Koehler

Hedtrich

Brandl

et al. 2017

J Biomedical Materials Res

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The number of patients with chronic wounds is increasing constantly in today's aging society. However, little work is done so far tackling the associated disadvantageous shift of the wound pH. In our study, we developed two different approaches on pH-modulating wound dressing materials, namely, bioactive interpenetrating polymer network hydrogels based on poly(ethylene glycol) diacrylate/N-vinylimidazole/alginate (named VI ) and poly(ethylene glycol) diacrylate/2-dimethylaminoethyl methacrylate/N-carboxyethylchitosan (named DMAEMA ). Both formulations showed a good cytocompatibility and wound healing capacity in vitro. The developed dressing materials significantly increased the cell ingrowth in wounded human skin constructs; by 364% and 313% for the VI and the DMAEMA hydrogel formulation, respectively. Additionally, VI hydrogels were found to be suitable scaffolds for superficial cell attachment. Our research on the material properties suggests that ionic interactions and hydrogen bonds are the driving forces for the mechanical and swelling properties of the examined hydrogels. High amounts of positively charged amino groups in DMAEMA hydrogels caused increased liquid uptake (around 190%), whereas VI hydrogels showed a 10-fold higher maximum compressive stress in comparison to hydrogels without ionizable functional groups. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 105A: 3360-3368, 2017.

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Poly(N‐vinylimidazole) based hydrogen bonded side chain liquid crystalline polymer

Cited by 12 publications

References 31 publications

Thermal properties of liquid crystal hexylbenzoic acid/octyloxybenzoic acid mixture

Thermal properties of liquid crystal hexylbenzoic acid/octyloxybenzoic acid mixture

Thermal and mesomorphic properties of ternary mixtures of some hydrogen-bonded liquid crystals

Alkaline poly(ethylene glycol)‐based hydrogels for a potential use as bioactive wound dressings

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