Results 271 to 280 of about 170,269 (299)
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Photoexcitations in Conjugated Copolymers
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, 1994We report in this short paper a preliminary account on the optical characterization and photoexcitation of a class of novel conjugated polymers consisting of regularly alternating thiophene and benzene sequences, which might represent models for one-dimensional superlattices. Optical absorption and emission spectra suggest that the barriers produced by
Chiara Botta +3 more
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Polyethylene‐based polyurethane copolymers and block copolymers
Macromolecular Symposia, 1995AbstractLow molecular weight hydroxy terminated polyethylene (HTPE) containing on average an ethyl group every 16–18 carbon atoms, and a hydroxy functionality of 2.6, has been used to prepare polyurethane copolymers and block copolymers which have good solvent resistance. The polymers show somewhat complicated thermal behavior, including Tg's at around
C. Richard Desper +4 more
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The Synthesis of Liquid Crystalline Copolymers with Block Copolymer Grafts
Macromolecular Chemistry and Physics, 2001The synthesis of novel copolymers consisting of a side-group liquid crystalline backbone and poly(tetrahydrofuran)-poly(methyl methacrylate) block copolymer grafts was realized by using cationic-to-free-radical transformation reactions. Firstly, photoactive poly(tetrahydrofuran) macroinimers were prepared by cationic polymerization of tetrahydrofuran ...
Y. Hepuzer +4 more
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Nucleo-copolymers: oligonucleotide-based amphiphilic diblock copolymers
Chemical Communications, 2007For the first time, poly(butadiene) has been covalently linked to an oligonucleotide sequence and the resulting nucleo-copolymer exhibits amphiphilic properties in dilute aqueous solution, self-assembling into nanometer-sized vesicular structures.
Per Rigler +2 more
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Graft Copolymer and Block Copolymer Surfaces
1985Homopolymers and random copolymers are relatively homogeneous in composition throughout their bulk. At the outermost molecular layer of such materials, the surface chemistry might differ substantially from the average bulk chemistry due to orientation effects, oxidation, or contamination.
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Orienting Block Copolymer Microdomains with Block Copolymer Brushes
ACS Nano, 2012A simple, rapid, and robust technique for controlling the self-assembly of block copolymers (BCPs) with a large segmental interaction parameter, χ, is described using a surface modified with anchored BCP brushes. End-functionalized poly(styrene-b-ethylene oxide)s (PS-b-PEOs), where the fraction of PS (f(PS)) was varied, end-functionalized neat PS, and ...
Weiyin Gu +2 more
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1995
Publisher Summary This chapter opens with a general discussion of joining techniques associated with Celcon acetal copolymer. Molded parts of Celcon acetal copolymer are joined by a variety of techniques. The crystalline polymer permits a high degree of long term structural loading on the joined assembly up to maximum service temperatures of 104°C ...
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Publisher Summary This chapter opens with a general discussion of joining techniques associated with Celcon acetal copolymer. Molded parts of Celcon acetal copolymer are joined by a variety of techniques. The crystalline polymer permits a high degree of long term structural loading on the joined assembly up to maximum service temperatures of 104°C ...
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International Journal of Polymeric Materials, 2002
We discuss the adsorption of multiblock copolymers at the interface between two selective solvents of the constituent monomers. We consider two cases, namely when the blocks are regular, and when the copolymer is made of random sequences. In both cases, we discuss the various surface regimes, and we compare the properties of the layers.
V. Aguie-Beghin, M. Daoud, R. Douillard
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We discuss the adsorption of multiblock copolymers at the interface between two selective solvents of the constituent monomers. We consider two cases, namely when the blocks are regular, and when the copolymer is made of random sequences. In both cases, we discuss the various surface regimes, and we compare the properties of the layers.
V. Aguie-Beghin, M. Daoud, R. Douillard
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Biodegradable block copolymers
Advanced Drug Delivery Reviews, 2001Recently, block copolymers have got tremendous impetus on the ongoing research in the area of drug delivery technology, due to their capability to provide a biomaterial having a broad range of amphiphilic characteristics, as well as targeting the drugs to specific site.
Abraham J. Domb +2 more
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On the rectilinearity of copolymers
Die Makromolekulare Chemie, 1991AbstractThe expression “stiffness” of a polymer chain is shown to be ambiguous, and the use of the word “rectilinearity” is proposed to replace it in certain contexts. The influence of non‐uniform curvature on Kuhn length and mean‐square end‐to‐end distance of (co)polymers is studied using the frameworks of the freely‐rotating‐chain model and the Porod‐
Bernd Jung, Michael Depner
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