Synthesis and Characterization of the Water-Soluble Oleoyl Acetyl Chitosan

2011 ◽  
Vol 284-286 ◽  
pp. 1782-1785
Author(s):  
Wei Chang Ke ◽  
Yi Kun Chen ◽  
Guo Xi Xiong ◽  
Xiang Hong Peng ◽  
Chao Zhu ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Acetic Anhydride ◽  
Chemical Structure ◽  
Water Soluble ◽  
Synthesis And Characterization ◽  
Nmr Spectrum ◽  
Ft Ir ◽  
Oleoyl Chloride ◽  
C Nmr

Oleoyl chloride was synthesized by oleic acid and thionyl dichloride (SOCl2), and then reacted with chitosan in dichloromethane to obtain the oleoyl chitosan. Novel water-soluble oleoyl acetyl chitosan (OACh) was synthesized using oleoyl chloride reacted with acetic anhydride in pyridine. The chemical structure of the OACh was characterized by FT-IR, 1H and 13C NMR. There existed the peaks at 1743.9 cm-1 (C=O) and 1658.1 cm-1(C=C) in FT-IR spectrum, and the peaks at 170.8, 171.6 and 172.5 ppm which were assigned to the C=O of the oleoyl and acetyl groups in 13C NMR spectrum. The results indicated that OACh had oleoyl as hydrophobic moieties and acetyl as hydrophilic moieties.

Synthesis and Characterization of Temperature-Sensitive TSPU/PNIPAAm Semi-IPN Polymer

2011 ◽  
Vol 399-401 ◽  
pp. 359-362 ◽  
Author(s):  
Yi Chun Wang ◽  
Zheng Wei Dai ◽  
Yuan Xue
Keyword(s):  
Chemical Structure ◽  
In Situ Polymerization ◽  
Phenyl Isocyanate ◽  
Chain Extender ◽  
Synthesis And Characterization ◽  
Temperature Sensitive ◽  
Sensitive Material ◽  
Ft Ir

Thermo-sensitive polyurethane (TSPU) was synthesized from poly(ε-caprolactone) and 4,4’-methylenebis (phenyl isocyanate) by a two-step process with 1,4-butanediol as the chain extender. Following that, a novel temperature-sensitive material was created by the strategy of IPN from TSPU and PNIPAAm in the method of in situ polymerization. The chemical structure and thermo properties of the semi-IPN were characterized with FT-IR and DSC. The results prove that intensive inter-molecular interactions exist between TSPU and PNIPAAm chains, which have significant influence on the phase transition behaviors of the material. According to these results, the transition temperature of the semi-IPN can be adjusted in the range of 30~40 °C by controlling the composition of TSPU and the semi-IPNs.

Synthesis and Characterization of Imidazo[1,2-a]Pyrimidine

2015 ◽  
Vol 52 ◽  
pp. 1-4
Author(s):  
A.M. Shah ◽  
A.J. Rojivadiya
Keyword(s):  
Mass Spectroscopy ◽  
Synthesis And Characterization ◽  
Spectroscopic Techniques ◽  
One Pot ◽  
H Nmr ◽  
Ft Ir ◽  
C Nmr

An efficient protocol for the synthesis of imidazo [1,2-a] pyrimidine was developed by using three component one-pot Biginelli synthesis. The synthesized compounds were characterized by spectroscopic techniques like FT-IR, 1H NMR, 13C NMR, and mass spectroscopy.

Synthesis and characterization of poly(4-oxyalkylenoxy benzoate)s of different chain length

e-Polymers ◽  
2009 ◽  
Vol 9 (1) ◽  
Author(s):  
Valentina Siracusa ◽  
Nadia Lotti ◽  
Concetto Puglisi ◽  
Filippo Samperi ◽  
Andrea Munari ◽  
...  
Keyword(s):  
Benzoic Acid ◽  
Chain Length ◽  
Elemental Analysis ◽  
Chemical Structure ◽  
Repeat Unit ◽  
Synthesis And Characterization ◽  
Chain Flexibility ◽  
Methylene Groups ◽  
C Nmr

AbstractThree different monomers starting from p-(4-hydroxy)benzoic acid and 3- chloro-1-propanol, 4-chloro-1-butanol and 6-chloro-1-hexanol, respectively, were synthesized and extensively characterized by means of 1H and 13C NMR, MALDITOF MS and elemental analysis. Subsequently, poly(4-oxyalkylenoxy benzoate)s polymers with different chain length were prepared in bulk starting from the mentioned above monomers, employing Ti(OBu)4 as catalyst, according to the usual two-stage polymerization procedure. The polymers were characterized in terms of chemical structure, molecular mass and thermal behaviour. Tg, Tm and the ability to crystallize were found to be affected by the number of methylene groups per repeat unit and the results were explained mainly on the basis of the increment of the chain flexibility.

scholarly journals Synthesis and Characterization of 1,3,5-Trisubstituted Pyrazoline Derivatives by Ultrasonic Irradiation Method and Evaluation of its Antibacterial Activity

2014 ◽  
Vol 39 ◽  
pp. 219-233 ◽  
Author(s):  
A. Raguraman ◽  
N. Santhi
Keyword(s):  
Antibacterial Activity ◽  
Antifungal Activity ◽  
Hydrazine Hydrate ◽  
Ultrasonic Irradiation ◽  
Synthesis And Characterization ◽  
Antibacterial And Antifungal Activity ◽  
Nmr Spectrum ◽  
Antibacterial And Antifungal ◽  
C Nmr

A series of novel 1,3,5-trisubstituted pyrazoline derivatives (P1-P10) have been synthesized by the reaction of substituted chalcones (C1-C10) with 4-hydroxybenzhydrazide. The starting material, chalcones were prepared by claisen Schmidt condensation of 4-methylacetophenone with substituted aldehydes in the presence of sodium hydroxide in ethanol. 4-hydroxybenzhydrazide was synthesized by condensing methyl 4-hydroxybenzoate with hydrazine hydrate. The cycloaddition of chalcones with 4-hydroxybenzhydrazide gives 1, 3, 5-trisubstituted pyrazoline derivatives. The structures of synthesized derivatives were confirmed by IR, 1HNMR and 13C NMR spectrum. The synthesized compounds were screened for their antibacterial and antifungal activity.

Synthesis and Characterization of Poly(N-Arylenebenzimidazole Ketone)

2012 ◽  
Vol 204-208 ◽  
pp. 4211-4214 ◽  
Author(s):  
Ye Wei Xu ◽  
Jie Tang ◽  
Guan Jun Chang ◽  
Fang Hua Zhu ◽  
Lin Zhang
Keyword(s):  
Weight Loss ◽  
Chemical Structure ◽  
Synthesis And Characterization ◽  
The Novel ◽  
Displacement Reaction ◽  
Good Solubility ◽  
Nucleophilic Displacement ◽  
Ft Ir ◽  
Good Agreement

Using 1,4-bis(2-benzimidazolyl) benzene (BBIB) and 4,4'-difluorobenzophenone as the monomers, poly(N-arylenebenzimidazole ketone) (PNABIK) has been prepared via the aromatic nucleophilic displacement reaction. The chemical structure of PNABIK was confirmed by FT-IR, elemental analysis and 1H NMR. The results show a good agreement with the proposed structures. The polymer was obtained in quantitative yields with Mn value 12500 and Mw value 28600, respectively. DSC and TGA measurements show that the glass transition temperature (Tg) is 202 °C and 5% weight loss temperature is 550°C in nitrogen and 571 °C in air, respectively. In addition, the novel polymer exhibit good solubility.

Synthesis and Characterization of Fluorescent Acrylamide Water Soluble Macromer

2012 ◽  
Vol 488-489 ◽  
pp. 216-220
Author(s):  
Datchanee Kraisiri ◽  
Nuanphun Chantarasiri ◽  
Vimolvan Pimpan
Keyword(s):  
Chemical Structure ◽  
Continuous Phase ◽  
Water Soluble ◽  
Proton Nuclear Magnetic Resonance ◽  
Synthesis And Characterization ◽  
Resonance Spectroscopy ◽  
Visible Absorption ◽  
Emulsifier System ◽  
Polymerization Method

Fluorescent acrylamide water soluble macromer was synthesized from dimethylaminopropylmethacrylamide-9-(chloromethyl)anthracene quaternary ammonium salt monomer using an inverse emulsion polymerization method. It was initiated by benzoylperoxide and stabilized by a co-emulsifier system consisting of Span®80 and Tween®60 dispersed in a continuous phase of cyclohexane with HLB value of 6.42. The polymerization was done at 80°C for 4 hours. The obtained macromer exhibited similar functional groups, ultraviolet-visible absorption and fluorescent emission but different solubility when compared to the monomer. Further analyses by proton nuclear magnetic resonance spectroscopy and mass spectrometry revealed the chemical structure of the macromer as a dimer of the monomer containing carcon-carbon double bonds.

scholarly journals Synthesis and Characterization of All Renewable Resources Based Branched Polyester: Poly(2,5-furandicarboxylic acid-co-glycerol)

2013 ◽  
Vol 2013 ◽  
pp. 1-4 ◽  
Author(s):  
Ananda S. Amarasekara ◽  
Ashfaqur Razzaq ◽  
Paul Bonham
Keyword(s):  
Elemental Analysis ◽  
Renewable Resources ◽  
Polyester Resin ◽  
Synthesis And Characterization ◽  
Ft Ir ◽  
Furandicarboxylic Acid ◽  
C Nmr

Condensation of all renewable resources based monomers 2,5-furandicarboxylic acid and glycerol in the presence of 2 mol% Sb2O3 catalyst at 210°C gives a branched polyester resin in 70% yield. This resin was characterized by elemental analysis, 1H, 13C NMR, FT-IR, and TGA-DTG.

Synthesis and Characterization of Quaternary Ammonium-Based Ionic Liquid

2012 ◽  
Vol 433-440 ◽  
pp. 178-182 ◽  
Author(s):  
She Ying Dong ◽  
Peng Hui Zhang ◽  
An Xiang Tian ◽  
Ting Lin Huang
Keyword(s):  
Ionic Liquid ◽  
Quaternary Ammonium ◽  
Synthesis And Characterization ◽  
H Nmr ◽  
Ft Ir ◽  
Conventional Methods ◽  
C Nmr

A quaternary ammonium-based ionic liquid, n-butyl triethylammonium bis(trifluoromethane-sulfonyl) imide (N4222TFSI) was synthesized by using microwave and conventional methods. The structure of N4222TFSI was characterized by FT-IR,1H-NMR and13C-NMR. Its properties including viscosity, solubility, conductivity and density, were determined. Its applications as electrolyte and solvent for UV-VIS determination were also investigated.

Preparation and Characterization of Soybean Oil-based Flame Retardant Rigid Polyurethane Foams Containing Phosphaphenanthrene Groups

2020 ◽  
Vol 17 (10) ◽  
pp. 760-771
Author(s):  
Qirui Gong ◽  
Niangui Wang ◽  
Kaibo Zhang ◽  
Shizhao Huang ◽  
Yuhan Wang
Keyword(s):  
Soybean Oil ◽  
Flame Retardant ◽  
Chemical Structure ◽  
Cell Structure ◽  
Polyurethane Foams ◽  
Limiting Oxygen Index ◽  
Rigid Polyurethane Foams ◽  
Degradation Activation Energy ◽  
Ft Ir

A phosphaphenanthrene groups containing soybean oil based polyol (DSBP) was synthesized by epoxidized soybean oil (ESO) and 9,10-dihydro-oxa-10-phosphaphenanthrene-10-oxide (DOPO). Soybean oil based polyol (HSBP) was synthesized by ESO and H2O. The chemical structure of DSBP and HSBP were characterized with FT-IR and 1H NMR. The corresponding rigid polyurethane foams (RPUFs) were prepared by mixing DSBP with HSBP. The results revealed apparent density and compression strength of RPUFs decreased with increasing the DSBP content. The cell structure of RPUFs was examined by scanning electron microscope (SEM) which displayed the cells as spherical or polyhedral. The thermal degradation and flame retardancy of RPUFs were investigated by thermogravimetric analysis, limiting oxygen index (LOI), and UL 94 vertical burning test. The degradation activation energy (Ea) of first degradation stage reduced from 80.05 kJ/mol to 37.84 kJ/mol with 80 wt% DSBP. The RUPF with 80 wt% DSBP achieved UL94 V-0 rating and LOI 28.3. The results showed that the flame retardant effect was mainly in both gas phase and condensed phase.

scholarly journals Semi-Crystalline Hydrophobic Polyamidoamines: A New Family of Technological Materials?

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1018
Author(s):  
Massimo Marcioni ◽  
Jenny Alongi ◽  
Elisabetta Ranucci ◽  
Mario Malinconico ◽  
Paola Laurienzo ◽  
...  
Keyword(s):  
Maximum Stress ◽  
Water Resistance ◽  
Prolonged Exposure ◽  
Water Soluble ◽  
Synthesis And Characterization ◽  
Molecular Weights ◽  
New Family ◽  
Methylene Groups ◽  
Methane Flame

The hitherto known polyamidoamines (PAAs) are not suitable as structural materials because they are usually water-soluble or swellable in water. This paper deals with the synthesis and characterization of semi-crystalline hydrophobic PAAs (H-PAAs) by combining different bis-sec-amines with bis-acrylamides obtained from C6–C12 bis-prim-amines. H-PAAs were initially obtained in a solution of benzyl alcohol, a solvent suitable for both monomers and polymers. Their number average molecular weights, M¯n, which were determined with 1H-NMR by evaluating the percentage of their terminal units, varied from 6000 to >10,000. The solubility, thermal properties, ignitability and water resistance of H-PAAs were determined. They were soluble in organic solvents, semi-crystalline and thermally stable. The most promising ones were also prepared using a bulk process, which has never been previously reported for PAA synthesis. In the form of films, these H-PAAs were apparently unaffected by water. The films underwent tensile and wettability tests. They showed similar Young moduli (260–263 MPa), whereas the maximum stress and the stress at break depended on the number of methylene groups of the starting bis-acrylamides. Their wettability was somewhat higher than that of common Nylons. Interestingly, none of the H-PAAs considered, either as films or powders, ignited after prolonged exposure to a methane flame.

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