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AbstractAbstract
[en] Selectivity in inter polymer complex formation involving a typical four-component phenolic copolymer (ρ-chloro phenol-ρ-aminophenol-ρ-toluidine-ρ-cresol- HCHO copolymer), poly electrolytes such as polyethylene imine and polyacrylic acid, a non-ionic homopolymer polyvinyl pyrrolidone, and some transition metal ions (e.g., Cu (II), Ni (11)) have been studied in dimethylformamide-methanol solvents mixture. The coordinating groups of phenolic copolymer form complexes through hydrogen bonding and ion-dipole interactions. The different stages of interactions have been studied by several experimental techniques, e.g., viscometry, potentiometry and conductometry. Some schemes have been suggested to explain the mode of interaction between these components
Primary Subject
Source
Available from Atomic Energy Organization of Iran
Record Type
Journal Article
Literature Type
Numerical Data
Journal
Iranian Polymer Journal; ISSN 1026-1265;
; v. 14(no.2); p. 147-154

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AbstractAbstract
[en] Analysis of dynamic properties of a simple globular protein, myoglobin, has demonstrated that it possesses a hierarchically organized energy landscape. It shows two types of specific protein motions, besides vibrations: 1) individual motions of small atomic groups - transitions between conformational substates (CS) of the lower tier 2, and 2) cooperative motions of secondary structure elements ( α-helices) - transitions between CS of the upper tier 1. The profile of macromolecule dynamic properties is highly heterogeneous. Only vibrations occur near the active center. The number of CS grows towards the periphery where specific type 1 and 2 motions become predominant. Such a picture is consistent with the concept of a protein as 'a random copolymer slightly edited in the vicinity of the active center'. (reviews of topical problems)
Primary Subject
Source
Available from http://dx.doi.org/10.1070/PU2002v045n11ABEH001145; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Physics Uspekhi; ISSN 1063-7869;
; v. 45(11); p. 1131-1151

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AbstractAbstract
[en] Bicontinuous morphologies are ubiquitous in nature and occur at various length scales. Topological features of two such morphologies arising in an ordered block copolymer at equilibrium and a polymer blend during spinodal decomposition are measured from three-dimensional images. Interfacial curvature, coordination number, and interjunction distance distributions exhibit remarkable similarity in these systems, despite vastly different length scales. A channel coordination of 3 is dominant in both morphologies, and topological measurements such as the Euler-Poincare characteristic and genus are reported
Primary Subject
Source
FG02-99ER14991; Othernumber: PLEEE8000064000001010803000001; R05107PRE
Record Type
Journal Article
Journal
Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics; ISSN 1063-651X;
; CODEN PLEEE8; v. 64(1); p. 010803-010803.4

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Cernoch, P.; Jager, A.; Cernochova, Z.; Sincari, V.; Konefal, R.; Pavlova, E.; Giacomelli, D. C.; Jager, E.; Albuquerque, L. J. C.
73. Congress of Chemists. Proceeding of Abstracts2021
73. Congress of Chemists. Proceeding of Abstracts2021
AbstractAbstract
[en] Novel, amphiphilic block copolymers based on the water-soluble poly(2-methyl-2-oxazoline) (PMeOx) block linked to the hydrophilic - hydrophobic pH-responsive block of poly[2- (diisopropylamino)ethyl methacrylate] (PDPA) were prepared via the combination of living cationic ring-opening polymerization (CROP) and reversible addition-fragmentation chain transfer polymerization (RAFT) techniques. Protein repelling properties of the PMeOx block together with pH-responsive behavior of the PDPA block linked together into diblock copolymer (BC) PMeOx-b-PDPA establish a huge potential for a new set of nanoplatforms potentially useful for tumor detection and therapy. (authors)
Primary Subject
Source
Slovak Chemical Society, 81215 Bratislava (Slovakia); Czech Chemical Society, 11668 Praha 1 (Czech Republic); European Association for Chemical and Molecular Sciences (EuCheMS), 1050 Brussels (Belgium). Funding organisation: Slovak Chemical Society, 81215 Bratislava (Slovakia); Czech Chemical Society, 11668 Praha 1 (Czech Republic); [235 p.]; 14 Sep 2021; p. 241; 73. Congress of Chemists; 73. Zjazd chemikov. Zbornik abstraktov; Vysoke Tatry, Horny Smokovec (Slovakia); 6-10 Sep 2019; ISSN 1336-7242;
; GRANTS GACR 20-15479J; FAPESP 2019/06634-8; FAPESP 2016/23844-8; FAPESP 2017/11261-0); CSF 20-13946Y; CSF 20-15077Y; Also vailable from https://73zjazd.schems.sk/zbornik-abstraktov/

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Miscellaneous
Literature Type
Conference
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Rehse, N.; Knoll, A.; Konrad, M.; Magerle, R.; Krausch, G.
Funding organisation: (US)2001
Funding organisation: (US)2001
AbstractAbstract
[en] The surface structure of a lamellar polystyrene-block-polybutadiene-block-polymethylmethacrylate (SBM) triblock copolymer forms a complex reconstruction, which breaks the two-dimensional continuous translational symmetry of an ideal (homogeneous) SBM surface. Despite the very different types of matter and order, our findings reveal a remarkable analogy with the well-known phenomenon of surface reconstruction of single crystals, in particular, with the (2 x 1) ''buckling row'' reconstruction of the Si(100) surface. Similarities and differences between both classes of materials are discussed on the basis of symmetry considerations
Primary Subject
Source
Othernumber: PRLTAO000087000003035505000001; 007129PRL
Record Type
Journal Article
Journal
Physical Review Letters; ISSN 0031-9007;
; v. 87(3); p. 035505-035505.4

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AbstractAbstract
No abstract available
Primary Subject
Source
SRPS 4: Synchrotron Radiation in Polymer Science; Kerkrade (Netherlands); 8-11 Sep 2009; Available from http://dx.doi.org/10.1088/1757-899X/14/1/012004; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Literature Type
Conference
Journal
IOP Conference Series. Materials Science and Engineering (Online); ISSN 1757-899X;
; v. 14(1); [2 p.]

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AbstractAbstract
[en] Hydrogels are polymers characterized by their ability to absorb a considerable amount of water. Hydrogels consist of polymer molecules physically or chemically crosslinked, forming a molecular network, so that in water they swell to an equilibrium value, preserving their shape [1]. The aim of this work was to prepare by gamma radiation poly (2-hydroxyethyl methacrylate-co-acrylamide) hydrogels, p(HEMA-co-AAm), doped with Nanoclay (laponite XLG). (Author)
Primary Subject
Source
Centro de Aplicaciones Tecnologicas y Desarrollo Nuclear (CEADEN), La Habana (Cuba); Instituto Superior de Tecnologias y Ciencias Aplicadas (InSTEC), La Habana (Cuba); Agencia de Energia Nuclear y Tecnologias de Avanzada (AENTA), La Habana (Cuba); 1 CD-ROM; ISBN 978-959-7136-79-8;
; Feb 2011; 854 KB; WONP-NURT 2011: 7. International Symposium on Nuclear and Related Techniques; La Habana (Cuba); 7-11 Feb 2011; 13. Workshop on Nuclear Physics; La Habana (Cuba); 7-11 Feb 2011; Available from Centro de Aplicaciones Tecnologicas y Desarrollo Nuclear (CEADEN), La Habana (CU). Email. marta@ceaden.edu.cu; Centro de Gestion de la Informacion y Desarrollo de la Energia (Cubaenergia), La Habana (CU) ,Email. belkis@cubaenergia.cu; 16 refs.; 3 tabs.; 16 figs.

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Multimedia
Literature Type
Conference
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Yağmur, İbrahim; Ak, Metin; Bayrakçeken, Ayşe, E-mail: metinak@pau.edu.tr, E-mail: metin-ak@hotmail.com2013
AbstractAbstract
[en] A centrosymmetric polymer precursor, 4-(2,5-di(thiophen-2-yl)-1H-pyrrol-1-yl)butan-1-amine (TPBA), was synthesized via a Knorr–Paal reaction and its copolymer with EDOT was electrochemically synthesized and characterized. While P(TPBA) has only two colors in its oxidized and neutral states, its copolymer with EDOT has eight different colors. Electrochromic devices based on P(TPBA)/PEDOT and P(TPBA-co-EDOT)/PEDOT were constructed and characterized. The oxidized state of the device shows blue color whereas it shows purple for the reduced state. At moderate potentials the device has good transparency with green and gray colors. The maximum contrast and switching time of the multielectrochromic copolymer device were measured as 25% and 0.8 s at 575 nm. Copolymerization not only increases the polymer’s color scheme, but also improves its properties, such as redox stability and switching time. (paper)
Primary Subject
Source
Available from http://dx.doi.org/10.1088/0964-1726/22/11/115022; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Smart Materials and Structures (Print); ISSN 0964-1726;
; v. 22(11); [9 p.]

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Honeker, C; Thomas, E; Albalak, R; Hajduk, D; Gruner, S; Capel, M
Brookhaven National Lab., Upton, NY (United States); National Synchrotron Light Source (United States). Funding organisation: USDOE Office of Energy Research (ER) (United States)2000
Brookhaven National Lab., Upton, NY (United States); National Synchrotron Light Source (United States). Funding organisation: USDOE Office of Energy Research (ER) (United States)2000
AbstractAbstract
No abstract available
Source
AC02-98CH10886
Record Type
Journal Article
Journal
Macromolecules; ISSN 0024-9297;
; v. 33(25); [10 p.]

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INIS VolumeINIS Volume
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AbstractAbstract
[en] The maximum stress and strain at break remained high and stable after MDI-mediated crosslinking. Similarly, shape recovery and shape retention tests also showed excellent and reproducible results. The MDI-mediated crosslinking was responsible for the interesting tensile and shape memory results. Therefore, it was demonstrated in this investigation that the allophanate type crosslinking, unlike previous misleading information, was possible under the mild reaction conditions. Polyurethane (PU) has long been investigated due to its excellent mechanical properties, shape memory effect, and biocompatibility, and was grafted with pendant functional groups to tailor the polymer characteristics without affecting their basic structure. Actually, polyethyleneglycol has been grafted to polyurethane to improve biocompatibility in biomedical applications, and low temperature flexibility could be improved by the pendant naphthol group grafted to PU. In the field of shape memory polyurethane, mechanical and shape memory properties could be improved by terminal crosslinking with glycerol, pentaerythritol, and dextrin. Alternatively, a flexible crosslinking method was devised to demonstrate both high mechanical strength and shape recovery
Primary Subject
Source
14 refs, 6 figs, 1 tab
Record Type
Journal Article
Journal
Bulletin of the Korean Chemical Society; ISSN 0253-2964;
; v. 33(2); p. 692-694

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