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Polypropylene membranes with the double sensitivity effect

12-12-2014 | Joanna Wolska, Katarzyna Smolinska‐Kempisty, Marek Bryjak, Wojciech Kujawski, Journal of Applied Polymer Science, 2014

ABSTRACT This article describes the modification of polypropylene membranes leading to the preparation of thermo‐ and pH‐sensitive structures. Poly(N‐isopropylacrylamide), poly(acrylic acid), or copolymer poly(N‐isopropylacrylamide‐co‐acrylic acid) was grafted on to the membranes' surface ...

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Properties of aligned poly(L‐lactic acid) electrospun fibers

12-12-2014 | Bin Mao, Keifer Geers, Sophia Hu, Marlet Mancera, Myra Sandoval, Joshua Port, Yazhe Zhu, Peggy Cebe, Journal of Applied Polymer Science, 2014

ABSTRACT Poly(L‐lactic acid) (PLLA)‐aligned fibers with diameters in the nano‐ to micrometer size scale are successfully prepared using the electrospinning technique from two types of solutions, different material parameters and working conditions. The fiber quality is evaluated using scanning ...

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Influence of preparation methods on the electrical and nanomechanical properties of poly(methyl methacrylate)/multiwalled carbon nanotubes composites

11-12-2014 | Katarína Mosnáčková, Zdenko Špitálský, Jaroslav Kuliček, Jan Prokeš, Amalia Skarmoutsou, Costas A. Charitidis, Mária ..., Journal of Applied Polymer Science, 2014

ABSTRACT Poly(methyl methacrylate)/multiwalled carbon nanotubes (PMMA/MWCNT) composites were prepared by two different methods: melt mixing and solution casting. For solution casting, two different solvents, toluene and chloroform, were used to prepare PMMA solutions with different ...

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Novel temperature‐sensitive and pH‐sensitive polyurethane membranes: preparation and characterization

10-12-2014 | Hu Zhou, Bin Yu, Ruiping Xun, Ning Li, Kejian Wu, Hanzhou Sun, Zhihua Zhou, Asia-Pacific Journal of Chemical Engineering, 2014

ABSTRACT The polyurethane (PU) membranes with temperature and pH double sensitivities for water permeation were designed and prepared from a two‐step solution polymerization from the crystalline polycaprolactone diols (PCL), 4,4′‐diphenylmethane diisocyanate (MDI) and pH‐sensitive ...

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An analytical study of the acoustic force implication on the settling velocity of non‐spherical particles in the incompressible Newtonian fluid

10-12-2014 | A. R. Noorpoor, S. Nazari, Asia-Pacific Journal of Chemical Engineering, 2014

ABSTRACT In this paper, the effect of the acoustic radiation force on the acceleration motion of a vertically falling non‐spherical particle in the incompressible Newtonian fluid is investigated. The using of the acoustic radiation force for increasing the falling velocity of particles ...

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Encapsulation of cinnamaldehyde into nanostructured chitosan films

10-12-2014 | Katrina A. Rieger, Nathaniel M. Eagan, Jessica D. Schiffman, Journal of Applied Polymer Science, 2014

ABSTRACT Recently, bioactive chitosan films featuring naturally derived essential oils have attracted much attention due to their intrinsic antimicrobial properties and applicability to a broad range of applications. Previously, the ability to form thick (t > 100 µm), chitosan‐essential oil ...

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Dynamic orientation of azopyridine units within the shell of vesicles PNIPAM‐b‐PAzPyn copolymers

10-12-2014 | Yingjue Wang, Guangyong Shen, Jiangang Gao, Gang Zou, Qijin Zhang, Journal of Polymer Science Part B: Polymer Physics, 2014

ABSTRACT Vesicles with hydrophobic shells have been self‐assembled through three kinds of amphiphilic block copolymers containing pendent azopyridine groups with different spacers, namely PNIPAM‐b‐PAzPyn (n = 0, 2, 6), respectively. By polarization laser‐trapping Raman spectroscopy, the ...

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New polynomial strain energy function; application to rubbery circular cylinders under finite extension and torsion

08-12-2014 | Marzieh Bahreman, Hossein Darijani, Journal of Applied Polymer Science, 2014

ABSTRACT In this article, a strain energy density function is proposed in terms of the principal invariants of the left Cauchy‐Green strain tensor for Rubber‐like materials. This model due to its mathematical structure lies in the category of polynomial hyperelastic models. To compare the ...

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Synthesis, characterization, and performance evaluation of the AM/AMPS/DMDAAC/SSS quadripolymer as a fluid loss additive for water‐based drilling fluid

08-12-2014 | Xiaodong Bai, Yi Yang, Dingyuan Xiao, Xiaolin Pu, Xu Wang, Journal of Applied Polymer Science, 2014

ABSTRACT According to the molecular structure design requirements of the fluid loss additive resistant to high temperature, 2‐acrylamide‐2‐methyl propane sulfonic acid (AMPS), acrylamide (AM), dimethyl diallyl ammonium chloride (DMDAAC) and sodium styrene sulfonate (SSS) are selected as the ...

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Corrosion inhibition of AISI 1020 steel based on tungstate anion and amoxicillin as corrosion inhibitors in 0.05 mol l−1 NaCl solution or inserted into cellulose acetate films

05-12-2014 | M. C. Scholant, E. F. Coutinho, S. P. Dias, D. S. Azambuja, S. N. Silva, S. M. Tamborim, Surface and Interface Analysis, 2014

Sodium tungstate and amoxicillin were used separately or combined in a solution containing 0.05 mol l−1 NaCl or inserted into cellulose acetate films as a corrosion inhibition method for American Iron and Steel Institute (AISI) 1020 steel. The electrochemical behavior of AISI 1020 steel was ...

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