Synthesis and Morphological Behavior of Silicon-Containing Triblock Copolymers for Nanostructure Applications

1998 ◽  
Vol 10 (8) ◽  
pp. 2109-2115 ◽  
Author(s):  
Apostolos Avgeropoulos ◽  
Vanessa Z-H Chan ◽  
Victor Y. Lee ◽  
Don Ngo ◽  
Robert D. Miller ◽  
...  
Keyword(s):  
Triblock Copolymers ◽  
Morphological Behavior

Effect of random midblock sequencing on the morphological characteristics of symmetric A(A/B)B triblock copolymers

1994 ◽  
Vol 52 ◽  
pp. 450-451
Author(s):  
Jonathan H. Laurer ◽  
Richard J. Spontak ◽  
Steven D. Smith ◽  
Arman Ashraf
Keyword(s):  
Diblock Copolymer ◽  
Diblock Copolymers ◽  
Triblock Copolymers ◽  
Morphological Characteristics ◽  
Morphological Features ◽  
Limited Attention ◽  
Composition Gradient ◽  
Molecular Architecture ◽  
Species Introduction ◽  
Morphological Behavior

Significant efforts have been put forth to elucidate the morphological features of strongly-segregated AB diblock copolymers, in which contiguous sequences of A and B monomers are incompatible and order into periodic morphologies. In this regime, interactions between chemically dissimilar blocks are repulsive, and the interphase separating adjacent microdomains is relatively narrow. While the properties of a diblock copolymer can be modified without changing monomer species, introduction of random A/B sequencing into the molecular architecture has received limited attention. The morphological features of diblock copolymers possessing one A/B block have been previously examined, and Smith et al. are currently exploring the morphological behavior of "random" diblock copolymers with two A/B blocks of differing composition. In this work, TEM is used to discern the morphologies of copolymers in which an A/B segment is incorporated between the endblocks (see Fig. 1). Tapered copolymers, wherein the A/B segment possesses a composition gradient, as well as non-tapered copolymers, are considered.

Morphological Behavior of Thermally Treated Polystyrene-b-polybutadiene-b-poly(ε-caprolactone) ABC Triblock Copolymers

2003 ◽  
Vol 36 (12) ◽  
pp. 4515-4525 ◽  
Author(s):  
V. Balsamo ◽  
G. Gil ◽  
C. Urbina de Navarro ◽  
I. W. Hamley ◽  
F. von Gyldenfeldt ◽  
...  
Keyword(s):  
Triblock Copolymers ◽  
Abc Triblock Copolymers ◽  
Morphological Behavior ◽  
Thermally Treated

Self-Assembly of Hydrogels From Elastin-Mimetic Block Copolymers

2002 ◽  
Vol 724 ◽  
Author(s):  
Elizabeth R. Wright ◽  
R. Andrew McMillan ◽  
Alan Cooper ◽  
Robert P. Apkarian ◽  
Vincent P. Conticello
Keyword(s):  
Block Copolymers ◽  
Self Assembly ◽  
Triblock Copolymers ◽  
Variable Temperature ◽  
Inverse Temperature ◽  
Temperature Transition ◽  
Scanning Calorimetry ◽  
Design Synthesis ◽  
Inverse Temperature Transition ◽  
Functional Biomaterials

AbstractTriblock copolymers have traditionally been synthesized with conventional organic components. However, triblock copolymers could be synthesized by the incorporation of two incompatible protein-based polymers. The polypeptides would differ in their hydrophobicity and confer unique physiochemical properties to the resultant materials. One protein-based polymer, based on a sequence of native elastin, that has been utilized in the synthesis of biomaterials is poly (Valine-Proline-Glycine-ValineGlycine) or poly(VPGVG) [1]. This polypeptide has been shown to have an inverse temperature transition that can be adjusted by non-conservative amino acid substitutions in the fourth position [2]. By combining polypeptide blocks with different inverse temperature transition values due to hydrophobicity differences, we expect to produce amphiphilic polypeptides capable of self-assembly into hydrogels. Our research examines the design, synthesis and characterization of elastin-mimetic block copolymers as functional biomaterials. The methods that are used for the characterization include variable temperature 1D and 2D High-Resolution-NMR, cryo-High Resolutions Scanning Electron Microscopy and Differential Scanning Calorimetry.

Multiscale Simulations of Triblock Copolymers

2007 ◽  
Vol 5 (3-4) ◽  
pp. 167-179 ◽  
Author(s):  
Jan Andzelm ◽  
Frederick L. Beyer ◽  
James Snyder ◽  
Peter W. Chung
Keyword(s):  
Triblock Copolymers ◽  
Multiscale Simulations

GLOBAL WARMING IMPACT ON URMIA LAKE VULNERABILITY AND HAZARD

2017 ◽  
Author(s):  
Homayoun Khoshravan ◽  
Homayoun Khoshravan
Keyword(s):  
Global Warming ◽  
Salt Marshes ◽  
Satellite Images ◽  
Field Research ◽  
Urmia Lake ◽  
Mud Volcanoes ◽  
Seismic Profiles ◽  
Global Warming Impact ◽  
Morphological Behavior ◽  
Different Parts

The main goal of the research is to analyze the global warming impact on Urmia lake vulnerabiliy and hazard. By the study of topographic maps, satellite images and field research, the various types of coasts were identified: mud flats, salt marshes, sandy or cliffed coasts, and islands. Moreover the interpretation of seismic profiles, has led to recognize so important morphological features in the lake bed, such as: erosive channels, colos, mud volcanoes, the raised sandy masses and under water mounts. The main results illustrate the variable morphological behavior of Urmia Lake in different parts of the lake.

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