Abstract:In this chapter we present salts composed of amino acids combined with inorganic cations and anions. These salts generally contain amino acids in neutral, i.e., zwitterionic form, with the charges balanced by the cations and anions. However, some of the phases resented here contain cations, anions, and amino acids, but the amino acids are not in neutral form, as, e.g., glycinate À Cu, but for reasons of similarity, they are included in this chapter. The variation of salts (and thus the number of species) is ev… Show more
“…It can be seen from Table 1 that MgCl 2 has the smallest cation radius and the largest lattice energy, so it's stability and the strength of ionic bond are both the highest, which contributes to forming stronger hydrogen bonding between Cl of MgCl 2 and –OH of EVOH, the mechanism of formation is shown in Figure 1 [16]. Figure 1 Mechanism of formation of the hydrogen bonding between –OH of EVOH and Cl of MgCl 2 .…”
Ethylene-vinyl alcohol (EVOH) with excellent barrier properties is insufficient in mechanical properties, which limits its application. For the purpose of enhancing mechanical properties of EVOH, blend of anhydrous magnesium chloride (MgCl 2 ) with EVOH was prepared by melt blending. Enhanced hydrogen bonding can be achieved through interaction between the Cl of MgCl 2 and -OH in EVOH, and the stronger hydrogen bonding between MgCl 2 and EVOH was confirmed by using Fourier transform infrared spectrometer and X-ray photoelectron spectroscopy. The chemical, thermal and mechanical properties were evaluated. The thermal analysis of blends demonstrated that the melting temperature (T m ), the crystallisation temperature (T c ) and the crystallinity were effectively decreased with adding MgCl 2 , on the contrary, the glass transition (T g ) was significantly increased from 42.8 to 77.5°C. The mechanical test results revealed that MgCl 2 can significantly improve the storage modulus and the viscosity of EVOH, also the tensile strength was raised by nearly 30%.
“…It can be seen from Table 1 that MgCl 2 has the smallest cation radius and the largest lattice energy, so it's stability and the strength of ionic bond are both the highest, which contributes to forming stronger hydrogen bonding between Cl of MgCl 2 and –OH of EVOH, the mechanism of formation is shown in Figure 1 [16]. Figure 1 Mechanism of formation of the hydrogen bonding between –OH of EVOH and Cl of MgCl 2 .…”
Ethylene-vinyl alcohol (EVOH) with excellent barrier properties is insufficient in mechanical properties, which limits its application. For the purpose of enhancing mechanical properties of EVOH, blend of anhydrous magnesium chloride (MgCl 2 ) with EVOH was prepared by melt blending. Enhanced hydrogen bonding can be achieved through interaction between the Cl of MgCl 2 and -OH in EVOH, and the stronger hydrogen bonding between MgCl 2 and EVOH was confirmed by using Fourier transform infrared spectrometer and X-ray photoelectron spectroscopy. The chemical, thermal and mechanical properties were evaluated. The thermal analysis of blends demonstrated that the melting temperature (T m ), the crystallisation temperature (T c ) and the crystallinity were effectively decreased with adding MgCl 2 , on the contrary, the glass transition (T g ) was significantly increased from 42.8 to 77.5°C. The mechanical test results revealed that MgCl 2 can significantly improve the storage modulus and the viscosity of EVOH, also the tensile strength was raised by nearly 30%.
“…P2 1 (4)], and trigonal [sp.gr. P3 2 (145) or P3 1 (144)] symmetry, respectively [2][3][4][5][6][7]. Nominally pure glycine single crystals are transparent in a wide spectral range.…”
Glycine (Gly) single crystals doped with croconic acid (CA) were grown by evaporation from aqueous solutions. Depending on the weight ratio of Gly and CA in solutions, the crystals take on a plate or pyramidal shape. Both powder and single crystal XRD analyses indicate that the crystal lattices of plates (α-Gly:CA) and pyramides (γ-Gly:CA) correspond to the lattices of pure α-Gly and γ-Gly polymorphs, respectively. Raman and FTIR spectra of Gly:CA crystals are very close to the spectra of undoped crystals, but include bands associated with CA impurity. Analysis of UV-Vis absorption spectra indicates that doping does not remarkably change bandgap value Eg~5.2 eV but results in appearance of strong absorption bands in the transparency region of pure glycine crystals, which result from local electronic transitions. Incorporation of CA molecules in Gly creates strong green photoluminescence in a wide spectral range 1.6–3.6 eV. Comparison of the optical spectra of Gly:CA and previously studied TGS:CA crystals indicates that in both cases, the modifications of the optical spectra induced by CA doping are practically identical and are related to the interaction between CA molecules located in the pores of the host Gly crystals and neighboring Gly molecules.
“…This crystal has good stability; however, few properties have been explored yet. 20 Also, to our knowledge, its interaction with polymeric films is not known, and it is a potential product for many biomedical applications.…”
Section: Introductionmentioning
confidence: 99%
“…The formation of single crystal allows to obtain a material with high purity, due to the crystalline arrangement making it difficult to insert impurities in the crystal structure. 20,22…”
Although the physical properties of polymers already have been modified by changing different synthetic parameters, the effect of the crystallization by the doping is still rarely explored. In this work, a facile synthesis of composite chitosan film with copper L-valinate crystal (CHLVCu) was investigate. Composite films were prepared by the addition of copper II L‐valine crystals (LVCu) in concentrations of 0.05, and 0.1 in 0.2% chitosan solution. The composite film of LVCu crystal dispersed in CH solution has been successfully obtained by the technique of solvent slow evaporation at low temperature. CHLVCu composite films are crystalline stabilizing the trans-LVCu phase. Homogeneity and low thermal stability have been proven by thermal measurements. The crystal growth takes place in the polymer surface. In addition, it is noteworthy that to the best of our knowledge, crystals complex of the LVCu has not been used as incorporate chitosan film and study has reported changes in physical properties composite film. The future this film can be application in area biomedical and technological.
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