scholarly journals Heat resisting and water-soluble chocolate polyesters containing azomethine group

2017 ◽  
Vol 35 (2) ◽  
pp. 303-312 ◽  
Author(s):  
Kevser Temizkan ◽  
İsmet Kaya
Keyword(s):  
Cyclic Voltammetry ◽  
Band Gap ◽  
Gel Permeation Chromatography ◽  
Mechanical Analysis ◽  
Water Soluble ◽  
Azomethine Group ◽  
Dynamical Mechanical Analysis ◽  
Mass Distributions ◽  
H Nmr ◽  
Ft Ir

Abstract In this study, soluble in water poly(azomethine-ester)s (PAEs) were synthesized via elimination reactions of aromatic dihydroxy compounds containing imine bonding with terephthaloyl chloride. The structures of Schiff bases (SBs) and PAEs containing different aliphatic chains were confirmed by FT-IR, 1H-NMR, 13C-NMR and UV-Vis analyses. Physicochemical properties of the new polymers were characterized. Thermal properties of the compounds were investigated by TGA-DTA, DMA and DSC. According to TGA measurements, the starting degradation temperatures (Ton) of P-1, P-2, P-3, and P-4 poly(azomethine-ester)s were found as 255 °C, 232 °C, 222 °C, and 221 °C, respectively. The starting degradation temperatures of the poly(azomethine-ester)s were higher than their Schiff base compounds. According to dynamical mechanical analysis (DMA) measurements, glass transition temperature (Tg) of P-1, P-2, P-3, and P-4 poly(azomethine-ester)s were found as 95 °C, 138 °C, 140 °C, and 145 °C, respectively. The morphological and topographic properties of the PAEs containing azomethine linkage in the main chain were investigated by FE-SEM and AFM, respectively. The molecular mass distributions of PAEs were determined by gel permeation chromatography (GPC). Electrochemical (E′g) and optical band gap (Eoptg ) values of the prepared SBs and PAEs were calculated from cyclic voltammetry (CV) and UV-Vis analyses. The electrochemical band gap (E′g) values of P-1, P-2, P-3 and P-4 were found as 2.44 eV, 2.41 eV, 2.39 eV and 2.39 eV, respectively, from the cyclic voltammetry.

Electrochemically Synthesis and Characterization of Copolymers Based on 1, 4-Diethoxybenzene and 3, 4-Ethylenedioxythiophene

2011 ◽  
Vol 335-336 ◽  
pp. 989-993
Author(s):  
Mi Ouyang ◽  
Zhen Wei Yu ◽  
Yi Xu ◽  
Yu Jian Zhang ◽  
Cheng Zhang
Keyword(s):  
Cyclic Voltammetry ◽  
Ir Spectroscopy ◽  
Feed Ratio ◽  
Synthesis And Characterization ◽  
Monomer Mixture ◽  
Long Wavelength ◽  
H Nmr ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Copolymers based on 1, 4-diethoxybenzene (DEB) and 3, 4-ethylenedioxythiophene (EDOT) were electrochemically synthesized and characterized. The structures of the copolymers were established by 1H NMR and FT-IR spectroscopy. The results indicated the final product was a copolymer instead of a blend or a composite. The physical properties were systematically investigated by cyclic voltammetry, UV-vis absorption and fluorescence. The PL maximum of copolymers presented obviously red-shift to long wavelength as the feed ratio of EDOT in monomer mixture increased.

Synthesis of Macromolecular Coupling Agent and its Effects on Polystyrene Composites

2014 ◽  
Vol 1053 ◽  
pp. 268-275
Author(s):  
Hong Wen Zhang ◽  
Shi Long Zhou ◽  
Yang Zhang ◽  
Yan Jiang ◽  
Qiang Yu
Keyword(s):  
Composite Materials ◽  
Gel Permeation Chromatography ◽  
Ultraviolet Spectrum ◽  
Butyl Methacrylate ◽  
Coupling Agents ◽  
Resonance Spectroscopy ◽  
H Nmr ◽  
Comprehensive Performance ◽  
Ft Ir ◽  
The Impact

Different molecular weight of block coupling agents with well-defined structures have been synthesized successfully by atom transfer radical polymerization (ATRP) from styrene (St), butyl methacrylate (BMA) and 3-methoxyacryloyl-propyltrimethoxyl silicon (KH-570) are as monomer. The structures and compositions of macromolecular coupling agents have been characterized by means of infrared spectrum (FT-IR), ultraviolet spectrum (UV), nuclear magnetic resonance spectroscopy (1H-NMR) and gel permeation chromatography (GPC). And their effects on the polystyrene/silica (PS/SiO2) composite materials have been studied. The results show that interface compatibility and mechanical properties of composite materials containing macromolecule coupling agents are improved significantly. The composite materials with block macromolecular coupling agents possess more excellent comprehensive performance. Furthermore, the impact strength increased by 110% when comparing with composite materials which are not modified by the coupling agents.

Cationic copolymerization of 1,3-pentadiene with α-pinene

2014 ◽  
Vol 34 (7) ◽  
pp. 583-589 ◽  
Author(s):  
Ai-Yuan Li ◽  
Xiang-Dong Sun ◽  
Hui-Bo Zhang ◽  
Yong-Chun Zhang ◽  
Bin Wang ◽  
...  
Keyword(s):  
Average Molecular Weight ◽  
Gel Permeation Chromatography ◽  
Polymerization Temperature ◽  
Scanning Calorimetry ◽  
Gardner Color ◽  
H Nmr ◽  
Cationic Copolymerization ◽  
Ft Ir ◽  
Better Than ◽  
C Nmr

Abstract The cationic copolymerization of 1,3-pentadiene (PD) with α-pinene (AP) initiated by aluminum trichloride (AlCl3) was carried out in N-pentane solvent. The effects of the polymerization temperature and the comonomer composition on the yield of the copolymer, softening point, Gardner color scale and number-average molecular weight (Mn) are discussed. The performance of the copolymer was better than that of AP homopolymer (PAP) and PD homopolymer (PPD). The structure of the copolymer was characterized by Fourier transform infrared spectroscopy (FT-IR), 1H-nuclear magnetic resonance (1H-NMR), 13C-NMR, differential scanning calorimetry (DSC) and gel permeation chromatography (GPC). In addition, the reactivity ratios for AP (M1) and PD (M2) determined by the Kelen-Tudos method from low-conversion data are r1=0.58 and r2=5.92, respectively.

How to Make a Latex Rubber Sculpture? Manufacturing Studies that Improve the Creative Work of an Artist

2012 ◽  
Vol 1374 ◽  
pp. 167-176
Author(s):  
Nora A. Pérez ◽  
José L. Ruvalcaba ◽  
Claudio Hernández ◽  
César Martínez
Keyword(s):  
Blow Up ◽  
Raw Materials ◽  
Mechanical Analysis ◽  
Comprehensive Understanding ◽  
Dynamical Mechanical Analysis ◽  
X Ray ◽  
Ft Ir ◽  
Main Factors ◽  
Manufacturing Techniques ◽  
Latex Rubber

ABSTRACTContemporary Art has the characteristic of being made with a wide diversity of materials. In this plastic age many of the artists employ polymers to create their works, but do not consider the degradation that their art will suffer eventually.This work presents the studies performed for improving the manufacture of a series of sculptures made of latex rubber that belong to the Museo Universitario Arte Contemporáneo (MUAC), UNAM, in Mexico City. These sculptures made by César Martínez are blow up and deflated continuously during their exhibition. Techniques such as Fourier Transformed Infrared (FT-IR), X-ray fluorescence (XRF) and Raman spectroscopies were used for characterizing the manufacturing techniques of the artist. Dynamical Mechanical Analysis (DMA) was carried out to correlate the mechanical properties with the raw materials.These analyses provide a comprehensive understanding of the material and the main factors that affect the degradation of the pieces. The combination of these studies made possible to suggest a new methodology to the artist in order to improve the quality and therefore enlarge the lifetime of his work.

Novel mono- and heterobimetallic chromium−nickel s-indacene complexes: synthesis, characterization, and DFT studies

2014 ◽  
Vol 92 (7) ◽  
pp. 677-683 ◽  
Author(s):  
Cesar Morales-Verdejo ◽  
Eduardo Schott ◽  
Ximena Zarate ◽  
Juan Manuel Manriquez
Keyword(s):  
Cyclic Voltammetry ◽  
Elemental Analysis ◽  
Molecular System ◽  
Theoretical Calculations ◽  
Dft Studies ◽  
Nickel Compound ◽  
H Nmr ◽  
Bridging Ligand ◽  
Ft Ir ◽  
C Nmr

The preparation of a novel heterobimetallic chromium−nickel compound (3), including 2,6-diethyl-4,8-dimethyl-5-hydroindacenide (IcH′) as bridging ligand was successfully achieved and it was characterized by means of 1H NMR, 13C NMR, and FT-IR spectroscopies and elemental analysis. Cyclic voltammetry studies were performed for complex 3 as well as for its respective mononuclear species. Theoretical calculations of this compound were carried out to gain further understanding of this novel molecular system.

A New Green Process for Synthesising High Quality PLLA Materials

2013 ◽  
Vol 750-752 ◽  
pp. 1377-1380 ◽  
Author(s):  
Hui Li Shao ◽  
Xian Jue Zhou ◽  
Xue Chao Hu
Keyword(s):  
Molecular Weight ◽  
Ring Opening ◽  
Average Molecular Weight ◽  
Gel Permeation Chromatography ◽  
Ring Opening Polymerization ◽  
Green Process ◽  
Weight Average Molecular Weight ◽  
H Nmr ◽  
Ft Ir ◽  
C Nmr

Synthesis of Poly(L-lactide) (PLLA) by the ring-opening polymerization (ROP) of L-lactides in supercritical carbon dioxide (SC-CO2) with co-solvent were studied. Effects of kinds of co-solvent on the molecular weight (MW) and the molecular weight distribution (MWD) of the resultant polymers were investigated by the gel permeation chromatography (GPC). The resultant polymers were also characterized with1H NMR,13C NMR and FT-IR. It was found that PLLA with high purity and almost without racemization could be obtained by this technology and the acetone is the best co-solvent for this kind of polymerization. By using stannous octoate as initiator and acetone as co-solvent, PLLA having a weight-average molecular weight (Mw) near to 9×104and polydispersity index (PDI) of 1.7 was successfully synthesized.

scholarly journals Synthesis, Characterization and Copolymerization of N-(phenylamino)maleimide with MMA

2007 ◽  
Vol 4 (2) ◽  
pp. 265-271
Author(s):  
B. L. Hiran ◽  
S. N. Paliwal ◽  
Jyoti Choudhary ◽  
P. R. Choudhary
Keyword(s):  
Thermal Stability ◽  
Molecular Weight ◽  
Density Measurement ◽  
Gel Permeation Chromatography ◽  
Radical Copolymerization ◽  
Free Radical Copolymerization ◽  
H Nmr ◽  
Gel Permeation ◽  
Ft Ir ◽  
Thermal Stability Of

The free radical copolymerization of N-(phenylamino)maleimide (N-PAMI) was carried. The copolymerization with methyl methacrylate (MMA) was performed at 65°C with AIBN as the initiator in THF solvent. Resulting copolymer was characterized by density measurement, intrinsic viscosity, solubility, FT-IR &1H NMR spectroscopy. Effect of the solvent and time on copolymer yield was also investigated. The molecular weight of copolymer was determined by gel permeation chromatography (GPC). The thermal stability of copolymer was determined by Thermogravimetric analysis (TGA).

Preparation of Terephthalic Acid (TPA) and Dioctyl Terephthalate (DOTP) by Anthracite's Alkali Oxygen Oxidation

2014 ◽  
Vol 541-542 ◽  
pp. 95-99
Author(s):  
Kun Du ◽  
Ming Lei Lian ◽  
Zhi Fang Fan ◽  
Yu Li
Keyword(s):  
Aqueous Solution ◽  
Terephthalic Acid ◽  
Potassium Hydroxide ◽  
Water Soluble ◽  
Reaction Conditions ◽  
H Nmr ◽  
Optimum Reaction ◽  
Final Yield ◽  
Ft Ir ◽  
Oxygen Oxidation

TPA was synthesized by a two step reaction. Firstly, water-soluble coal acids (CA) was obtained by oxygen-oxidation at 260°C in all aqueous solution of potassium hydroxide, and then crud TPA was got by isomerization of the CA with the existence of CdCO3 catalyst and CO2 pressure. The optimum reaction conditions to get crude TPA were 4% amount of CdCO3 catalyst, and reacted at 420°C with initial 3.0MPa CO2 pressure. Pure TPA was obtained by a separation step and the yield of pure TPA is 37.16% (based on CA). Furthermore, DOTP was synthesized by the refined TPA and isooctanol. The influence of mole ratio of TPA and isooctanol, amount of catalyst and reaction time on the final yield of DOTP were discussed. The purity of TPA was detected by HPLC and DOTP was detected by FT-IR, 1H-NMR to get confirmatory results.

The Structure and Properties of Sulfo-Butylated Celluluse Ether (SBC) Based Water-Reducing Agents

2014 ◽  
Vol 556-562 ◽  
pp. 433-440
Author(s):  
Halidan Maimaiti ◽  
Xuekelaiti Aerken
Keyword(s):  
Cement Paste ◽  
Water Soluble ◽  
Crystalline Cellulose ◽  
Cellulose Ether ◽  
Hardened Cement ◽  
Structure And Properties ◽  
Hardened Cement Paste ◽  
Sem Images ◽  
H Nmr ◽  
Ft Ir

Abandoned cellulose was treated with acid to prepare Micro-Crystalline Cellulose (MCC) holding affirmative polymerization, which was then treated with 1,4–butanesultone (BS) to synthesize water-soluble Sulfo-Butylated Cellulose ether (SBC). The structure of the SBC was characterized by means of FT-IR, 1H NMR, SEM, and XRD, and its relationship to function was investigated based on the polymerization of MCC and Degree of Substitution (DS). SEM images of hardened cement were also studied. The results indicated that when the polymerization of the MCC was smaller than 96 and the DS greater than 0.375, SBC exhibited water-reduction. When sulfonated cellulose was mixed into the cement paste, its retarding effect slowed hydration early in the aging process, so that later the structure of hardened cement paste became more uniform and compact than that of control.

New Anti-Aging and Anti-Wrinkle Material: Properties and Activities of Nanoparticle Containing Poly(Aspartic Acid) Derivatives

2019 ◽  
Vol 59 ◽  
pp. 57-76
Author(s):  
Hyo Gyeong Yu ◽  
Hong Geun Ji ◽  
Ju Duck Kim ◽  
Hye In Jang
Keyword(s):  
Aspartic Acid ◽  
Chemical Structure ◽  
Synthetic Polymer ◽  
Water Soluble ◽  
Skin Permeability ◽  
Collagenase Activity ◽  
H Nmr ◽  
Emulsifying Agent ◽  
Ft Ir ◽  
Alpha Amino Acid

Polymers such as sodium polyacrylate; polysaccharides in starch; polyamino acids, which are the products of alpha-amino acid condensation; and polypeptides are widely used in cosmetics and pharmaceuticals. They are used as viscosity agent, emulsifying agent, and carriers for drug delivery. However, we studied the function of polymers as activity agent, especially that of synthesized poly(aspartic acid). Poly(aspartic acid) is a biocompatible synthetic polymer. It is a water-soluble polyamide containing carboxylic pendants prepared from polysuccinimide, the polycondensate of aspartic acid monomer, by hydrolysis. In this study, we prepared poly(aspartic acid) derivatives conjugated with L-lysine or L-lysine and other materials. The chemical structure of these polymers was confirmed by FT-IR and 1H-NMR spectroscopy. Moreover, these novel poly(aspartic acid) derivatives stimulated typeⅠcollagen biosynthesis and inhibited MMP-1(collagenase) activity. We could conclude that the microfludization process improved skin permeability and confirmed better permeability than that achieved with existing nano emulsions.

Sign in / Sign up

Export Citation Format

Share Document