Results 241 to 250 of about 114,151 (273)

Computer simulation of copolymer-copolymer and copolymer-homopolymer mixtures with a single interaction energy

Macromolecules, 1989
Etude des interactions dans des melanges copolymere/polymere (A x B 1 - x /B) et copolymere/copolymere A x B 1 - y contenant des quantites egales des 2 composantes en fonction des compositions du copolymere, respectivement x et|x-y|, et des energies d'interaction segmentaire a l'aide d'un modele reticulaire carre ...
William J. MacKnight, Peter Cifra, Frank E. Karasz   +2 more
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Miscibility Study in Fluorinated Tetrafluoroethylene Copolymer−Copolymer Blends

Macromolecules, 2001
The miscibility of random fluorinated tetrafluoroethylene copolymers is investigated by differential scanning calorimetry (DSC) and X-ray diffraction (XRD). In particular, mixtures composed of poly(tetrafluoroethylene)-co-(hexafluoropropylene) (FEP) containing 1 mol % of comonomer and poly(tetrafluoroethylene)-co-(perfluoromethylvinyl ether) (PFMVE ...
R. PUCCIARIELLO, V. VILLANI, RUIZ DE BALLESTEROS, ODDA   +2 more
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Photoexcitations in Conjugated Copolymers

Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, 1994
We 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, Laura Rossi, Silvia Destri, Riccardo Tubino   +3 more
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Block Copolymer Nanocontainers

ACS Nano, 2010
Using cell dynamics computer simulation, we perform a systematic study of thin block copolymer films around a nanoparticle. Lamellar-, cylinder-, and sphere-forming block copolymers are investigated with respect to different film thicknesses, particle radii, and boundary conditions at the film interfaces.
Pinna, Marco, Hiltl, Stephanie, Guo, Xiaohu, Böker, Alexander, Zvelindovsky, Andrei   +4 more
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Polyethylene‐based polyurethane copolymers and block copolymers

Macromolecular Symposia, 1995
AbstractLow 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, Yingjie Li, Benjamin Chu, N. S. Schneider, Catherine A. Byrne   +4 more
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The Synthesis of Liquid Crystalline Copolymers with Block Copolymer Grafts

Macromolecular Chemistry and Physics, 2001
The 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, I. E. Serhatli, Y. Yagci, GALLI, GIANCARLO, CHIELLINI, EMO   +4 more
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Nucleo-copolymers: oligonucleotide-based amphiphilic diblock copolymers

Chemical Communications, 2007
For 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, Francisco Teixeira, Corinne Vebert-Nardin   +2 more
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Orienting Block Copolymer Microdomains with Block Copolymer Brushes

ACS Nano, 2012
A 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, Thomas P. Russell, Sung Woo Hong   +2 more
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Graft Copolymer and Block Copolymer Surfaces

1985
Homopolymers 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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Acetal Copolymer

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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