Chain Folding in Semicrystalline Oxybutylene/Oxyethylene/Oxybutylene Triblock Copolymers Studied by Raman Spectroscopy

2003 ◽  
Vol 107 (29) ◽  
pp. 6946-6953 ◽  
Author(s):  
Kyriakos Viras ◽  
Antonis Kelarakis ◽  
Vasiliki Havredaki ◽  
Shao-Min Mai ◽  
Anthony J. Ryan ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Triblock Copolymers ◽  
Chain Folding

Facile topological transformation of ABA triblock copolymers into multisite, single-chain-folding and branched multiblock copolymers via sequential click coupling and anthracene chemistry

2021 ◽  
Vol 12 (5) ◽  
pp. 725-735
Author(s):  
Yanzhe He ◽  
Zhigang Wang ◽  
Peng Liu ◽  
Xiangdong Zhou ◽  
Youliang Zhao
Keyword(s):  
Triblock Copolymers ◽  
Multiblock Copolymers ◽  
Single Chain ◽  
Topological Transformation ◽  
Chain Folding ◽  
On Demand ◽  
Click Coupling

Telechelic PtBA-b-PSt-b-PtBA copolymers were designed to achieve on-demand topological transformation into multisite, single-chain-folding and branched multiblock copolymers via click/click-like reactions.

Low-Frequency Raman Spectroscopy of Oxyethylene/Oxybutylene/Oxyethylene Triblock Copolymers

2004 ◽  
Vol 37 (8) ◽  
pp. 3077-3079 ◽  
Author(s):  
Kyriakos Viras ◽  
Shao-Min Mai ◽  
Anthony J. Ryan ◽  
Ga-Er Yu ◽  
Colin Booth ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Triblock Copolymers ◽  
Low Frequency

Chain folding in poly(ɛ-caprolactone) studied by small-angle X-ray scattering and Raman spectroscopy. A strategy for blending in the crystalline state

1999 ◽  
Vol 9 (5) ◽  
pp. 1059-1063 ◽  
Author(s):  
Susan A. Berrill ◽  
Frank Heatley ◽  
John H. Collett ◽  
David Attwood ◽  
Colin Booth ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Small Angle ◽  
Crystalline State ◽  
X Ray ◽  
Chain Folding ◽  
X Ray Scattering ◽  
Ray Scattering

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.

High-resolution gold labeling

1993 ◽  
Vol 51 ◽  
pp. 330-331
Author(s):  
James F. Hainfeld ◽  
Frederic R. Furuya ◽  
Kyra Carbone ◽  
Martha Simon ◽  
Beth Lin ◽  
...  
Keyword(s):  
Dihydrofolate Reductase ◽  
Polypeptide Chain ◽  
External Surface ◽  
Gold Cluster ◽  
Macromolecular Complex ◽  
Gold Compound ◽  
Central Cavity ◽  
Chain Folding ◽  
E Coli ◽  
Chaperonin Groel

A recently developed 1.4 nm gold cluster has been found to be useful in labeling macromolecular sites to 1-3 nm resolution. The gold compound is organically derivatized to contain a monofunctional arm for covalent linking to biomolecules. This may be used to mark a specific site on a structure, or to first label a component and then reassemble a multicomponent macromolecular complex. Two examples are given here: the chaperonin groEL and ribosomes.Chaperonins are essential oligomeric complexes that mediate nascent polypeptide chain folding to produce active proteins. The E. coli chaperonin, groEL, has two stacked rings with a central hole ∽6 nm in diameter. The protein dihydrofolate reductase (DHFR) is a small protein that has been used in chain folding experiments, and serves as a model substrate for groEL. By labeling the DHFR with gold, its position with respect to the groEL complex can be followed. In particular, it was sought to determine if DHFR refolds on the external surface of the groEL complex, or whether it interacts in the central cavity.

Raman spectroscopy and X-ray diffraction of lithium niobate at temperatures up to 1300○-4.80pt○C

2005 ◽  
Vol 126 ◽  
pp. 101-105 ◽  
Author(s):  
B. Moulin ◽  
L. Hennet ◽  
D. Thiaudière ◽  
P. Melin ◽  
P. Simon
Keyword(s):  
Raman Spectroscopy ◽  
Lithium Niobate ◽  
X Ray Diffraction ◽  
X Ray
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