Morphological Behavior of Sulfonated Styrene-Ethylene/Propylene-Styrene Triblock Copolymers

2006 ◽  
Author(s):  
Brian D. Mather ◽  
Frederick L. Beyer ◽  
Timothy E. Long
Keyword(s):  
Triblock Copolymers ◽  
Ethylene Propylene ◽  
Morphological Behavior

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

Solvent-assisted osmium staining of butyl acrylate and ethylene-propylene-diene in a styrene acrylonitrile matrix

1993 ◽  
Vol 51 ◽  
pp. 900-901 ◽  
Author(s):  
Gudrun A. Hutchins
Keyword(s):  
Butyl Acrylate ◽  
Room Temperature ◽  
Osmium Tetroxide ◽  
Staining Procedure ◽  
Reactive Site ◽  
Ethylene Propylene ◽  
Minimal Distortion ◽  
Styrene Acrylonitrile ◽  
Engineering Polymers ◽  
Effective Reaction

In order to optimize the toughening effect of elastomers in engineering polymers, it is necessary to characterize the size, morphology and dispersion of the specific elastomer within the polymer matrix. For unsaturated elastomers such as butadiene or isoprene, staining with osmium tetroxide is a well established procedure. The residual carbon-carbon double bond in these materials is the reactive site and forms a 1,2-dilato complex with the OsO4. Incorporation of osmium tetroxide into the elastomer not only produces sufficient contrast for TEM, but also crosslinks the elastomer sufficiently so that ultramicrotomy can be accomplished at room temperature with minimal distortion.Blends containing saturated elastomers such as butyl acrylate (BA) and ethylene propylene diene monomer (EPDM) cannot be stained directly with OsO4 because effective reaction sites such as C=C or -NH2 are not available in sufficient number. If additional reaction sites can be introduced selectively into the elastomer by a chemical reaction or the absorption of a solvent, a modified, two-step osmium staining procedure is possible.

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
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