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3.646 Aktuelle Fachpublikationen zum Thema temperature

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Poly(l‐lactic acid) with the organic nucleating agent N,N,N′‐tris(1H‐benzotriazole) trimesinic acid acethydrazide: Crystallization and melting behavior

15.05.2015 | Yan‐Hua Cai, Ying Tang, Li‐Sha Zhao, Journal of Applied Polymer Science, 2015

ABSTRACT N,N,N′‐Tris(1H‐benzotriazole) trimesinic acid acethydrazide (BD) was synthesized from 1H‐benzotriazole acetohydrazide and trischloride to serve as an organic nucleating agent for the crystallization of poly(l‐lactic acid) (PLLA). First, the thermogravimetric analysis of BD exhibited a ...

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High‐Performance Liquid Chromatographic Enantioseparation of Cyclic β‐Amino Acids on Zwitterionic Chiral Stationary Phases Based on Cinchona Alkaloids

14.05.2015 | István Ilisz, Zsanett Gecse, Gyula Lajkó, Enikõ Forró, Ferenc Fülöp, Wolfgang Lindner, Antal Péter, Chirality, 2015

Abstract Stereoselective high‐performance liquid chromatographic separations of eight sterically constrained cyclic β‐amino acid enantiomer pairs were carried out using the newly developed Cinchona alkaloid‐based zwitterionic chiral stationary phases Chiralpak ZWIX(+) and ZWIX(−). The effects ...

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Effect of electrical properties on gas sensitivity of polypyrrole/cds nanocomposites

14.05.2015 | Bharati Yeole, Tanushree Sen, D. P. Hansora, Satyendra Mishra, Journal of Applied Polymer Science, 2015

ABSTRACT In the present work, polypyrrole (PPy) nanocomposites were synthesized using ferric chloride (FeCl3) as an oxidant by in situ polymerization at room temperature. Cadmium sulfide (CdS) nanoparticles were synthesized by ultrasonication technique with size ranging between 60 and 110 nm. ...

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Crystallization behavior and mechanical properties of an electrospun ethanol‐mediated poly(ethylene terephthalate) fibrous membrane

14.05.2015 | Li‐Na Wang, Yan‐Wei Wang, Wen‐Tao Liu, Xue‐Lian Xia, Su‐Qin He, Hao Liu, Cheng‐Shen Zhu, Journal of Applied Polymer Science, 2015

ABSTRACT A simple approach for preparing electrospun poly(ethylene terephthalate) (PET) fibrous membranes with excellent spinnability and mechanical properties is introduced in this article. To enhance the electrospinnability of PET, a small content of ethanol was incorporated into a 16 wt % ...

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Cationic polymerization behavior of β‐methylglycidyl ether derivatives and physical properties of their cationically cured materials

14.05.2015 | Ken‐ichi Tamaso, Ryo Ogawa, Kozo Matsumoto, Takeshi Endo, Journal of Applied Polymer Science, 2015

ABSTRACT β‐Methylglycidyl ethers have been applied to Electrical and Electronic adhesives. However, there is no report about the detailed polymerization behavior and physical properties of their cured products. Hence, we investigated cationic polymerization behavior of bisphenol A ...

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Atmospheric pressure anion mass spectrometry: electron affinities and activation energies of thermal electron attachment – perfluoromethylcyclohexane, C7F14

13.05.2015 | Edward S. Chen, Edward C. M. Chen, Louis K. Barrera, Charles Herder, Rapid Communications in Mass Spectrometry, 2015

Rationale Perfluorocarbons such as perfluoromethylcyclohexane (c‐C6F11‐CF3) are important man‐made chemicals that have many uses including plasma processing, blood substitutes and atmospheric tracers. It is important to know the kinetics and thermodynamics of the reactions of thermal electrons ...

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Computer simulations and analysis of structural and energetic features of crystalline cage energetic compound: 2, 4, 6, 8, 12‐pentanitro‐10‐(3, 5, 6‐trinitro (2‐pyridyl))‐2, 4, 6, 8, 12‐hexaazatetracyclo [5.5.0.03,11.05,9]dodecane

12.05.2015 | Jian‐ying Zhang, Xue‐dong Gong, Journal of Physical Organic Chemistry, 2015

First principles molecular orbital and plane‐wave ab initio calculations have been used to investigate the structural and energetic properties of a new cage compound 2, 4, 6, 8, 12‐pentanitro‐10‐(3, 5, 6‐trinitro (2‐pyridyl))‐2, 4, 6, 8, 12‐hexaazatetracyclo [5.5.0.03,11.05,9]dodecane ...

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A highly selective polybenzimidazole‐4,4′‐(hexafluoroisopropylidene)bis(benzoic acid) membrane for high‐temperature hydrogen separation

12.05.2015 | Sun Hee Choi, Da Hye Kim, Do Young Kim, Jun Young Han, Chang Won Yoon, Hyung Chul Ham, Jin‐Ho Kim, Hyoung‐Juhn Kim, ..., Journal of Applied Polymer Science, 2015

ABSTRACT A polymeric gas separation membrane utilizing polybenzimidazole based on 4,4′‐(hexafluoroisopropylidene)bis(benzoic acid) was prepared. The synthesized membrane has an effective permeating area of 8.3 cm2 and a thickness of 30 ± 2 µm. Gas permeation properties of the membrane were ...

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Dual‐stimuli‐responsive polymer‐coated mesoporous silica nanoparticles used for controlled drug delivery

12.05.2015 | Mei‐Yan Yang, Lei Tan, Hai‐Xia Wu, Chuan‐Jun Liu, Ren‐Xi Zhuo, Journal of Applied Polymer Science, 2015

ABSTRACT In this article, a temperature‐ and pH‐responsive delivery system based on block‐copolymer‐capped mesoporous silica nanoparticles (MSNs) is presented. A poly[2‐(diethylamino)ethyl methacrylate)] (PDEAEMA)‐b‐poly(N‐isopropyl acrylamide) (PNIPAM) shell on MSNs was obtained through the ...

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Preparation and swelling properties of homopolymeric alginic acid fractions/poly(N‐isopropyl acrylamide) graft copolymers

11.05.2015 | Fabián Martínez‐Gómez, María V. Encinas, Betty Matsuhiro, Jorge Pavez, Journal of Applied Polymer Science, 2015

ABSTRACT Graft copolymers of crosslinked poly(N‐isopropyl acrylamide) (PNIPAAm) and homopolyguluronic acid (GG) and homopolymannuronic acid (MM) fractions of alginic acid were synthesized. MM and GG block fractions were obtained by partial acid hydrolysis of the alkaline extract from the brown ...

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