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Self-healing polyacrylic acid hydrogels

18-09-2013 | Umit Gulyuz; Oguz Okay, Soft Matter, 2013

pH responsive physical gels were prepared by micellar copolymerization of acrylic acid with 2 mol % stearyl methacrylate in the solution of worm-like sodium dodecyl sulfate micelles. The physical gels are insoluble in water and exhibit time-dependent dynamic moduli, high Young’s modulus (6 – 53 ...


Studies on Crystal growth, Vibrational, Dielectric, electronic, Mechanical and Thermal properties of new organic nonlinear optical crystal: 3-Nitrocinnamic acid

17-09-2013 | D SAJAN; Alen S; Job Sabu; Udayalakshmi K; Veeraiah V; Chaitanya K, CrystEngComm, 2013

3-Nitrocinnamic acid (3NCA) is synthesized and the crystals have been grown in aqueous solution by slow evaporation solution growth technique. Grown crystal was confirmed by powder XRD studies. The geometry, intermolecular hydrogen bonding, and harmonic vibrational wavenumbers of 3NCA have been ...


Solution-processed amorphous niobium oxide as a novel electron collection layer for inverted polymer solar cells

16-09-2013 | Author(s): Keisuke Hamada , Naoya Murakami , Toshiki Tsubota , Teruhisa Ohno, Chemical Physics Letters, 2013

Publication date: Available online 13 September 2013 Source:Chemical Physics Letters Author(s): Keisuke Hamada , Naoya Murakami , Toshiki Tsubota , Teruhisa Ohno Amorphous niobium oxide (NbOx) as an electron collection layer in inverted polymer solar cells was prepared by a solution ...


Production of polyamic acid in supercritical carbon dioxide with N,N‐dimethylformamide

13-09-2013 | Masashi Haruki, Yumi Hasegawa, Naoya Fukui, Shin‐ichi Kihara, Shigeki Takishima, Journal of Applied Polymer Science, 2013

ABSTRACT To develop a microscale processing technique for aromatic polyimides (APIs) in supercritical carbon dioxide (scCO2), the relationships between the polymerization condition, the phase behavior during polymerization and the molecular weight of polyamic acid (PAA)—an intermediate in the ...


Composite films of N,O‐carboxymethyl chitosan and bamboo fiber

13-09-2013 | Xue Zheng, Hao Zhang, Ying She, Junwen Pu, Journal of Applied Polymer Science, 2013

ABSTRACT To obtain an antibacterial chitosan derivative, composite films of N,O‐Carboxymethyl Chitosan (N,O‐CMCS) and bamboo fiber were prepared. A water‐soluble chitosan derivative‐N,O‐CMCS was synthesized from chitosan with chloroacetic acid in alkaline solution. Composite films with 1–5 wt ...


Corrosion resistance of investment casting samples of CF8 stainless steel in different passivation conditions

12-09-2013 | T. S. Pertile, E. J. Birriel, Materials and Corrosion, 2013

This study evaluated the corrosion performance of specimens of investment casting CF8 stainless steel, in different passivation conditions. The samples of a metallurgical industry were heat treated, blasted with steel grit, and surface treated with an aqueous solution used in the passivation ...


Synthesis and Characteristics of a Biobased High-Tg Terpolyester of Isosorbide, Ethylene Glycol, and 1,4-Cyclohexane Dimethanol: Effect of Ethylene Glycol as a Chain Linker on Polymerization

12-09-2013 | Won Jae Yoon; Sung Yeon Hwang; Jun Mo Koo; Yoo Jin Lee; Sang Uck Lee; Seung Soon Im, Macromolecules, 2013

A solution for overcoming the low reactivity of terephthalic acid and isosorbide (ISB) is proposed that uses 1,4-cyclohexane dimethanol and ethylene glycol. Using the different reactivities, volatilities, and degree of steric hindrances among the three diols, a highly heat-resistive biobased ...


Spray‐Dried Structured Lipid Containing Long‐Chain Polyunsaturated Fatty Acids for Use in Infant Formulas

11-09-2013 | Supakana Nagachinta, Casimir C. Akoh, Journal of Food Science, 2013

Abstract Human milk fat (HMF) analogs are structured lipids (SLs) modified to have palmitic acid content at the sn‐2 position of the triacylglycerol (TAG) and fatty acid composition comparable to HMF. Some of these SLs are also designed to incorporate long‐chain polyunsaturated fatty acids ...


Chemical Speciation of Metal Complexes from Chemical Shift Calculations: The Interaction of 2-Amino-N-hydroxypropanamide with V(V) in Aqueous Solution

11-09-2013 | Hélio Anderson Duarte; Nina Vankova; Isabella Pires Ferreira; Eucler B. Paniago; Thomas Heine, Journal of Physical Chemistry B, 2013

The chemical speciation of 2-amino-N-hydroxypropanamide (β-alaninohydroxamic acid, HL) and vanadium (V) in aqueous solution has been investigated through calculations of the thermodynamic properties and the 51V nuclear magnetic resonance (NMR) chemical shifts of the species formed at equilibrium. ...


A highly sensitive “test paper” for Hg2+ ions based on polyurethane membrane

10-09-2013 | Xianghong Li, Zhen Yang, Xinjian Cheng, Huijuan Zhang, Guiping Wu, Aiqing Zhang, Polymers for Advanced Technologies, 2013

Heavy metals have caused a lot of serious problems to human beings. A reusable, highly sensitive metal sensor based on polyurethane membrane, which can detect and remove Hg2+ ions, was prepared and tested in this work. A sensor with hydroxyl (−OH) group was grafted to polyurethane, and the heavy ...


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