MACROSCOPIC " SINGLE CRYSTALS " OF AN S-B-S THREE BLOCK COPOLYMER

1971 ◽  
Vol 32 (C5) ◽  
pp. C5a-295-C5a-300
Author(s):  
A. KELLER ◽  
J. DLUGOSZ ◽  
M. J. FOLKES ◽  
E. PEDEMONTE ◽  
F. P. SCALISI ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Single Crystals

scholarly journals Preparation of Macroscopic Block‐Copolymer‐Based Gyroidal Mesoscale Single Crystals by Solvent Evaporation

2019 ◽  
Vol 31 (40) ◽  
pp. 1902565 ◽  
Author(s):  
Ethan M. Susca ◽  
Peter A. Beaucage ◽  
R. Paxton Thedford ◽  
Andrej Singer ◽  
Sol M. Gruner ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Single Crystals ◽  
Solvent Evaporation

Rheology of Phase Separated Block Copolymer Melts

1989 ◽  
Vol 177 ◽  
Author(s):  
H. Henning Winter ◽  
Faith A. Morrison
Keyword(s):  
Block Copolymer ◽  
Block Copolymers ◽  
Single Crystals ◽  
Domain Structure ◽  
Shear Direction ◽  
Cylindrical Domain ◽  
Global Order ◽  
Copolymer Melts ◽  
Cylindrical Domains ◽  
Hexagonally Ordered

Flow can transfer the microphase separated morphology of block copolymers into a state of global order. For tri-block copolymers with cylindrical domains, this has been demonstrated by Folkes et al. (1973) and Hadziioannou et al. (1979). who established the existence of ‘single crystals’ of hexagonally ordered cylinders with uniform director throughout a sheared sample. The director is aligned with the shear direction. In this study, we investigate the flow induced ordering of cylindrical domain structure at increasing levels of shear.

Influence of chemical structure on enzymatic degradation of single crystals of PCL-b-PEO amphiphilic block copolymer

Polymer ◽  
2010 ◽  
Vol 51 (11) ◽  
pp. 2426-2434 ◽  
Author(s):  
Ni Jiang ◽  
Shidong Jiang ◽  
Yi Hou ◽  
Shouke Yan ◽  
Guangzhao Zhang ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Single Crystals ◽  
Chemical Structure ◽  
Enzymatic Degradation ◽  
Amphiphilic Block Copolymer

scholarly journals Morphology-preserving transformation of minerals mediated by a temperature-responsive polymer membrane: calcite to hydroxyapatite

CrystEngComm ◽  
2016 ◽  
Vol 18 (13) ◽  
pp. 2289-2293 ◽  
Author(s):  
A. C. S. Jensen ◽  
A. Brif ◽  
B. Pokroy ◽  
M. Hinge ◽  
H. Birkedal
Keyword(s):  
Block Copolymer ◽  
Single Crystals ◽  
Particle Morphology ◽  
Polymer Membrane ◽  
Temperature Responsive ◽  
Responsive Polymer

A membrane of a temperature sensate block copolymer facilitates transformation of calcite single crystals into hydroxyapatite while preserving overall particle morphology.

ChemInform Abstract: Nonionic Block Copolymer Synthesis of Large-Pore Cubic Mesoporous Single Crystals by Use of Inorganic Salts.

ChemInform ◽  
2010 ◽  
Vol 33 (29) ◽  
pp. no-no
Author(s):  
Chengzhong Yu ◽  
Bozhi Tian ◽  
Jie Fan ◽  
Galen D. Stucky ◽  
Dongyuan Zhao
Keyword(s):  
Block Copolymer ◽  
Single Crystals ◽  
Inorganic Salts ◽  
Large Pore ◽  
Cubic Mesoporous

Nonionic Block Copolymer Synthesis of Large-Pore Cubic Mesoporous Single Crystals by Use of Inorganic Salts

2002 ◽  
Vol 124 (17) ◽  
pp. 4556-4557 ◽  
Author(s):  
Chengzhong Yu ◽  
Bozhi Tian ◽  
Jie Fan ◽  
Galen D. Stucky ◽  
Dongyuan Zhao
Keyword(s):  
Block Copolymer ◽  
Single Crystals ◽  
Inorganic Salts ◽  
Large Pore ◽  
Cubic Mesoporous

The Microstructure of Shock-Synthesized Diamond

1967 ◽  
Vol 25 ◽  
pp. 324-325
Author(s):  
Lucien F. Trueb
Keyword(s):  
Single Crystals ◽  
Preferred Orientation ◽  
High Magnification ◽  
Texture Pattern ◽  
Shock Process ◽  
New Type ◽  
Diffraction Diagram

A new type of synthetic industrial diamond formed by an explosive shock process has been recently developed by the Du Pont Company. This material consists of a mixture of two basically different forms, as shown in Figure 1: relatively flat and compact aggregates of acicular crystallites, and single crystals in the form of irregular polyhedra with straight edges.Figure 2 is a high magnification micrograph typical for the fibrous aggregates; it shows that they are composed of bundles of crystallites 0.05-0.3 μ long and 0.02 μ. wide. The selected area diffraction diagram (insert in Figure 2) consists of a weak polycrystalline ring pattern and a strong texture pattern with arc reflections. The latter results from crystals having preferred orientation, which shows that in a given particle most fibrils have a similar orientation.

A New Defect in Polyethylene Single Crystals

1973 ◽  
Vol 31 ◽  
pp. 70-71
Author(s):  
E. L. Thomas ◽  
S. L. Sass
Keyword(s):  
Single Crystals ◽  
Screw Dislocation ◽  
Small Distance ◽  
Dipole Model ◽  
Dislocation Dipole ◽  
Chain Folding ◽  
Black And White ◽  
Polymer Crystal ◽  
Different Types

In polyethylene single crystals pairs of black and white lines spaced 700-3,000Å apart, parallel to the [100] and [010] directions, have been identified as microsector boundaries. A microsector is formed when the plane of chain folding changes over a small distance within a polymer crystal. In order for the different types of folds to accommodate at the boundary between the 2 fold domains, a staggering along the chain direction and a rotation of the chains in the plane of the boundary occurs. The black-white contrast from a microsector boundary can be explained in terms of these chain rotations. We demonstrate that microsectors can terminate within the crystal and interpret the observed terminal strain contrast in terms of a screw dislocation dipole model.

Preferential Sputtering of Ni3Al Single Crystals Studied Using Atom-Probe Field-Ion Microscopy and XPS

1981 ◽  
Vol 39 ◽  
pp. 16-17
Author(s):  
M.P. Thomas ◽  
A.R. Waugh ◽  
M.J. Southon ◽  
Brian Ralph
Keyword(s):  
Single Crystals ◽  
Photoelectron Spectroscopy ◽  
Surface Composition ◽  
Depth Profiling ◽  
Analytical Techniques ◽  
Atom Probe ◽  
Probe Field ◽  
Preferential Sputtering ◽  
Argon Ion Bombardment ◽  
Argon Ion

It is well known that ion-induced sputtering from numerous multicomponent targets results in marked changes in surface composition (1). Preferential removal of one component results in surface enrichment in the less easily removed species. In this investigation, a time-of-flight atom-probe field-ion microscope A.P. together with X-ray photoelectron spectroscopy XPS have been used to monitor alterations in surface composition of Ni3Al single crystals under argon ion bombardment. The A.P. has been chosen for this investigation because of its ability using field evaporation to depth profile through a sputtered surface without the need for further ion sputtering. Incident ion energy and ion dose have been selected to reflect conditions widely used in surface analytical techniques for cleaning and depth-profiling of samples, typically 3keV and 1018 - 1020 ion m-2.

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