Grafting of Chitosan: Structural, Thermal and Antimicrobial Properties

2019 ◽  
Vol 41 (2) ◽  
pp. 240-240
Author(s):  
Nevin Cankaya Nevin Cankaya
Keyword(s):  
Antimicrobial Activity ◽  
Graft Copolymers ◽  
Thermo Gravimetric Analysis ◽  
Antimicrobial Properties ◽  
Gravimetric Analysis ◽  
Analysis Method ◽  
Methacryloyl Chloride ◽  
Thermo Gravimetric ◽  
Thermal Stabilities ◽  
Ft Ir

In this study, some new chitosan materials were synthesized by the grafting of chitosan with the monomers such as 1-vinylimidazole (VIM), methacrylamide (MAm) and 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS). First of all, chitosan methacrylate was prepared by esterification of primary -OH group with methacryloyl chloride a 25.13% yield by mole. The monomers were grafted into chitosan methacrylate via free radical polymerization using 2,2and#39;-Azobisisobutyronitrile as an initiator in N,N-dimethylformamide. The graft copolymers were characterized by FT-IR spectra and elemental analysis. Thermal stabilities of the graft copolymers were determined by TGA (thermo gravimetric analysis) method. The synthesized chitosan methacrylate and its graft copolymers were tested for their antimicrobial activity against bacteria and yeast.

Functionalization of α-ZrP by 1,2-Epoxypropane for Further Modification

2017 ◽  
Vol 898 ◽  
pp. 2347-2353
Author(s):  
Ahmed Hossamaldin ◽  
Ping Liu ◽  
Ya Du ◽  
Xiao Ze Jiang ◽  
Bin Sun ◽  
...  
Keyword(s):  
Epoxy Group ◽  
Thermo Gravimetric Analysis ◽  
Mas Nmr ◽  
Interlayer Distance ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
Grafting Ratio ◽  
Internal Surfaces ◽  
Carbon Mass ◽  
Ft Ir

To prepare alpha zirconium phosphate (α-ZrP) with high interlayer distance, grafting ratio and thermal stability, 1,2-epoxypropane was used to modify α-ZrP as the epoxy group reacting with P-OH on the external and internal surfaces of α-ZrP to form P-O-C bonds after small amines pre-intercalation. Different characterization techniques were used, including X-ray Powder Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR), Thermo-Gravimetric Analysis (TGA) and Carbon Mass Nuclear Magnetic Resonance (13C MAS NMR). The results of XRD confirmed the pre-intercalation of amino-propane and the intercalation of 1,2-epoxypropane, as the interlayer distance increased from 7.5 Å to 16.9 Å and 15.3 Å, respectively. FT-IR and 13C MAS NMR results confirmed the formation of P-O-C bonds between 1,2-epoxypropane and α-ZrP. TGA analysis showed that the grafting ratio of 1,2-epoxypropane was 19.44%.

scholarly journals In vitro Complexation of Olmesartan Medoxomil with Dapagliflozin, Vildagliptin and Metformin

2019 ◽  
Vol 18 (2) ◽  
pp. 271-280 ◽  
Author(s):  
Fahima Aktar ◽  
Md Zakir Sultan ◽  
Mohammad A Rashid
Keyword(s):  
Drug Interactions ◽  
Thermo Gravimetric Analysis ◽  
Olmesartan Medoxomil ◽  
Therapeutic Agents ◽  
Gravimetric Analysis ◽  
Thermochemical Properties ◽  
Scanning Calorimetry ◽  
Thermo Gravimetric ◽  
Ft Ir

Drug-drug interactions have been a serious concern for pharmacokinetics, pharmacodynamics and pharmacological profiles of therapeutic agents. The aim of this study was to carry out interactions of olmesartan medoxomil with dapagliflozin, vildagliptin and metformin, which were confirmed by TLC, HPLC and FT-IR. The newly formed complexes showed characteristic thermochemical properties in differential scanning calorimetry (DSC) and thermo gravimetric analysis (TGA). In TLC, three spots from the three complexes were found to be different from their precursor drugs. In HPLC chromatograms, the Rt (retention time) of the pure olmesartan medoxomil, dapagliflozin, vildagliptin and metformin were found to be different from their respective complexes. The FT-IR spectra obtained for drug-drug interactions were seen to demonstrate new pattern of peaks compared to pure drugs. The DSC and TGA thermograms of olmesartan medoxomil, dapagliflozin, vildagliptin and metformin were also found to be different from their complexes. All these variations from parent compounds indicated the formation of new complexes. Dhaka Univ. J. Pharm. Sci. 18(2): 271-180, 2019 (December)

Preparation and Characterization of Sulfonated Imide-Grafted Poly(ethersulfone)s

2011 ◽  
Vol 695 ◽  
pp. 45-48
Author(s):  
Dong Wan Seo ◽  
Young Don Lim ◽  
Soon Ho Lee ◽  
Md. Monirul Islam ◽  
Hyun Mi Jin ◽  
...  
Keyword(s):  
Thermo Gravimetric Analysis ◽  
Chlorosulfonic Acid ◽  
Exchange Capacity ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
Ion Exchange Capacity ◽  
H Nmr ◽  
Triethyl Amine ◽  
Ft Ir

Poly(ethersulfone)s carrying pendant sulfonated imide side group. The first step in the preparation involved nitration of poly(ethersulfone) (ultrason®-S6010), with ammonium nitrate and trifluoroacetic anhydride resulting in the nitrated poly(ethersulfone) (NO2-PES). In the second step, the nitro groups on polymer were reacted with tin(II)chloride and sodium iodide as reducing agents for creating the amino poly(ethersulfone) (NH2-PES). The imide-poly(ethersulfone)s (IPES) were obtained by reaction of phthalic anhydride and the amino-poly(ethersulfone) with triethyl amine. The sulfonated imide-poly(ethersulfone)s (SIPES) were prepared by chlorosulfonic acid. The different degrees of sulfonated imide units of poly(ethersulfone) were successfully synthesized by an optimized condition. The Sulfonated imide-poly(ethersulfone)s (SIPES) were studied by FT-IR,1H-NMR spectroscopy and thermo gravimetric analysis(TGA). Sorption experiments were conducted to observe the interaction of sulfonated polymers with water. The ion exchange capacity (IEC) and proton conductivity of SIPES membranes were evaluated with increase of degree of sulfonation. The water uptake of synthesized SIPES membranes exhibit 30 ~ 65 % compared with 28 % of Nafion 211®. The SIPES membranes exhibit proton conductivities (25 °C) of 1.21 ~ 2.62´10-3S/cm compared with 3.37´10-3S/cm of Nafion 211®.

CRYSTAL GROWTH, THERMAL, OPTICAL AND MICROHARDNESS STUDIES OF TRIS (THIOUREA) MAGNESIUM SULPHATE: A SEMIORGANIC NLO MATERIAL

2009 ◽  
Vol 23 (25) ◽  
pp. 3035-3043 ◽  
Author(s):  
G. PASUPATHI ◽  
P. PHILOMINATHAN
Keyword(s):  
Magnesium Sulphate ◽  
Second Harmonic ◽  
Thermo Gravimetric Analysis ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Thermo Gravimetric ◽  
Thermal Stabilities ◽  
Growth Technique ◽  
Temperature Solution ◽  
Solution Growth Technique

Single crystals of tris (Thiourea) magnesium sulphate (MTS) were grown from aqueous solution by low temperature solution growth technique. The grown crystals have been characterized by X-ray diffraction to confirm the formation of the crystalline phases. The presence of functional groups was identified by Fourier transform infrared spectroscopy. The optical transmission spectrum showed that a lower cut-off wavelength of MTS crystal is below 300 nm and it has a wide transparency window, which is suitable for second harmonic generation of laser in the blue region. The thermal stabilities were studied by differential thermal analysis (DTA) and thermo gravimetric analysis (TGA). Nonlinear optical characteristics of MTS were studied using Q-switched Nd:YAG laser (λ=1064 nm ). The micro-hardness studies reveal the mechanical properties of the grown crystals.

Effect of DFA Modification on Thermal Properties of Multifunctional Epoxy/Anhydride Systems

2017 ◽  
Vol 748 ◽  
pp. 35-38
Author(s):  
Ming Ming Yu ◽  
Lin Fang ◽  
Min Yang ◽  
Hong Li ◽  
Mu Su Ren ◽  
...  
Keyword(s):  
Epoxy Resins ◽  
Dynamic Method ◽  
Degradation Kinetics ◽  
Thermo Gravimetric Analysis ◽  
Thermal Degradation Kinetics ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
Thermal Stabilities ◽  
Ozawa Model ◽  
Thermal Stability Of

The thermal stabilities of two amine based multifunctional epoxy resins (TGDDE/MNA & TGBAPP/MNA) and two dimer carboxylic acid (DFA) toughened resins (DFA-TGDDE/MNA & DFA-TGBAPP/MNA) were comparatively investigated with the thermo-gravimetric analysis (TG). The TG parameters of the resins indicated that the thermal stability of the resins was increased after the modification. Furthermore, the thermal degradation kinetics was studied with a dynamic method according to Ozawa model, which explained this phenomenon.

Preparation, Characterization and Properties of Biodegradable GO/PPC Composites

2013 ◽  
Vol 469 ◽  
pp. 112-116
Author(s):  
Xia He ◽  
Ling Ling Wu ◽  
Jia Jun Wang ◽  
Hai Long Liu
Keyword(s):  
Thermal Properties ◽  
Food Packaging ◽  
Thermo Gravimetric Analysis ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
Promising Alternative ◽  
Solution Blending ◽  
Blending Method ◽  
Ft Ir ◽  
Poly Propylene

A novel biodegradable and biocompatible composite of Poly (propylene carbonate) (PPC) and graphenes oxide (GO) was prepared by a solution blending method. The chemical structure, thermal properties and microscopic morphologies of the GO/PPC composites were characterized by Fourier transform infrared spectroscopy (FT-IR), thermo gravimetric analysis (TGA) and scanning electron microscopy (SEM). It was shown that the GO/PPC composites with 0.75 wt% GO performed a significant improvement on mechanical properties and thermal properties, as compared with the neat PPC. This composite could become a promising alternative to non-biodegradable for food packaging materials.

scholarly journals Synthesis and Characterization of Some New Thermal Stable Polymers - Polymerization of N-[4-N´ -(Benzylamino-carbonyl)phenyl]maleimide

2007 ◽  
Vol 4 (2) ◽  
pp. 222-231 ◽  
Author(s):  
B. L. Hiran ◽  
Jyoti Chadhary ◽  
S. N. Paliwal ◽  
Suresh Meena ◽  
P. R. Chaudhary
Keyword(s):  
Free Radical ◽  
Thermo Gravimetric Analysis ◽  
Radical Copolymerization ◽  
Synthesis And Characterization ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
H Nmr ◽  
Free Radical Initiator ◽  
Ft Ir

This article describes the synthesis and characterization of homopolymer (H-BCPM) of N-[4-N'-(benzylamino-carbonyl) phenyl] maleimide (N-BACPMI) and copolymer (C-BCPM) of N-BACPMI withn-butyl acrylate (BA). The new monomer was synthesized fromp-aminobenzoic acid, maleic anhydride and benzylamine. The homopolymerization of N-BACPMI is initiated by free radical using AIBN in THF solvent at 65°C. Radical copolymerization of N-BACPMI with BA, initiated by AIBN, was performed in THF solvent using equimolar amount. Effect of the different free radical initiator AIBN, BPO and solventsp-Dioxane, THF, DMF and DMSO was studied. Homopolymer and Copolymer were characterized by intrinsic viscosity, solubility test, FT-IR,1H-NMR spectral analysis and elemental analysis. Thermal behaviour was studied by Thermo gravimetric analysis.

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