نتایج جستجو برای: prolylene copolymer

تعداد نتایج: 12139  

2006
Seung Hyun Kim Matthew J. Misner Ling Yang Oleg Gang Benjamin M. Ocko Thomas P. Russell

Ion complexation within cylinder-forming block copolymer thin films was found to affect the ordering process of the copolymer films during solvent annealing, significantly enhancing the long-range positional order. Small amounts of alkali halide or metal salts were added to PS-b-PEO, on the order of a few ions per chain, where the salt complexed with the PEO block. The orientation of the cylind...

2016
A.P. Bonartsev G. A. Bonartseva V. L. Myshkina V. V. Voinova T. K. Mahina I. I. Zharkova S. G. Yakovlev A. L. Zernov E. V. Ivanova E. A. Akoulina E. S. Kuznetsova V. A. Zhuikov S. G. Alekseeva V. V. Podgorskii I. V. Bessonov M. N. Kopitsyna A. S. Morozov E. Y. Milanovskiy Z. N. Tyugay G. S. Bykova M. P. Kirpichnikov K. V. Shaitan

Production of novel polyhydroxyalkanoates (PHAs), biodegradable polymers for biomedical applications, and biomaterials based on them is a promising trend in modern bioengineering. We studied the ability of an effective strain-producer Azotobacter chroococcum 7B to synthesize not only poly(3-hydroxybutyrate) homopolymer (PHB) and its main copolymer poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (P...

2003
James J. Semler Jan Genzer

We present results of Monte Carlo simulation studies utilizing the bond fluctuation model in conjunction with single and configurational biased Monte Carlo moves to investigate the adsorption of diblock ~A–b–B! and alternating ~A–alt–B! copolymers at physically flat surfaces made of an equal number of two chemically different sites, C and D. The adsorption of the copolymer to the surface is dri...

Journal: :Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 2005
Maria C H da Silva Luis H M da Silva Fernanda J Paggioli

This work proposes a new method for Co(II) determination based on the use of the triblock copolymer as micellar medium instead of chloroform. The proposed strategy is environmental friendly because the copolymer is biodegradable and nontoxic. The method is based on the formation of a cobalt-1-nitroso-2-naphthol complex, in the micellar triblock copolymer compound solution constituted by polyeth...

2002
Sevim Z. Erhan Quan Sheng Atanu Adhvaryu

A copolymer of dodecyl methacrylate/styrene (DMA/St) containing the amidine functionality was synthesized and characterized. The one-step solution copolymerization process was carried out using a mixed solvent, high temperature, and a functional azo initiator, 2,2 -azobis[N,N -dimethylene isobutyramidine]. Copolymers with different compositions (DMA/St 10/1 to 1/2), molecular weight (Mn 2000–90...

Journal: :Journal of pharmaceutical sciences 2011
Tiewei Wang Chunling Zhang Xing-Jie Liang Wei Liang Yan Wu

A novel biodegradable amphiphilic copolymer composed of hydroxypropyl-β-cyclodextrin, polylactide, and 1,2-dipalmitoyl-sn-glycero-3-phosphoethanolamine, was successfully synthesized. The chemical structures of copolymers were determined by FT-IR, (1)H nuclear magnetic resonance (NMR) spectroscopy, (13)C NMR, (31)P NMR, thermogravimetric analysis ,and differential scanning calorimetry. Doxorubic...

2000
Yiwen Tang Xing-Zhong Zhao Helen L. W. Chan C. L. Choy

Electrical field-induced strain response of electron-irradiated poly~vinylidene fluoride-trifluoroethylene! copolymer has been studied by a Mach–Zehnder type heterodyne interferometer in the frequency range of 3–9 kHz. The electrostrictive constant is calculated from the strain results, which is of the same order of magnitude as those obtained at 1 Hz by a bimorph-based strain sensor but at muc...

2008
Christopher K. Ober Katy Bosworth Evan Schwartz Michelle Chavis

Next generation photoresist systems using block copolymer self-assembly have been developed and characterized within the Ober Research Group. Block copolymers containing methacrylate polymer backbones have been designed for low absorption in 193 nm lithography. The polymers synthesized are composed of two polymer chains that can be selectively crosslinked or removed, respectively, from the poly...

2010
Michelle K Gaines Steven D Smith Jon Samseth Saad A Khan Richard J Spontak

Incorporation of nanoparticles composed of surface-functionalized fumed silica (FS) or native colloidal silica (CS) into a nanostructured block copolymer yields hybrid nanocomposites whose mechanical properties can be tuned by nanoparticle concentration and surface chemistry. In this work, dynamic rheology is used to probe the frequency and thermal responses of nanocomposites composed of a symm...

Journal: :Carbohydrate polymers 2008
Wengui Duan Chunhong Chen Linbin Jiang Guang Hua Li

Graft copolymerization of rosin-(2-acryloyloxy)ethyl ester (RAEE) onto chitosan (Cts) was carried out under microwave irradiation using potassium persulfate as an initiator. The structures, morphology, and thermal properties of the Cts graft copolymer (Cts-g-PRAEE) were characterized by means of FT-IR, XRD, SEM, and TG. Also, Cts and Cts-g-PRAEE copolymer were used as carriers of fenoprofen cal...

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