Regulation of Micellar Morphology of PCL-b-PEO Block Copolymers by Crystallization Temperature

2008 ◽  
Vol 29 (6) ◽  
pp. 467-471 ◽  
Author(s):  
Zi-Xiu Du ◽  
Jun-Ting Xu ◽  
Zhi-Qiang Fan
Keyword(s):  
Block Copolymers ◽  
Crystallization Temperature ◽  
Micellar Morphology

scholarly journals Controlling the micellar morphology of binary PEO–PCL block copolymers in water–THF through controlled blending

Soft Matter ◽  
2011 ◽  
Vol 7 (2) ◽  
pp. 749-759 ◽  
Author(s):  
Peter Schuetz ◽  
Martin J. Greenall ◽  
Julian Bent ◽  
Steve Furzeland ◽  
Derek Atkins ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Micellar Morphology

Effect of Cyclization of Polystyrene/Polyisoprene Block Copolymers on Their Micellar Morphology

2002 ◽  
Vol 23 (16) ◽  
pp. 978-982 ◽  
Author(s):  
Edson Minatti ◽  
Redouane Borsali ◽  
Michel Schappacher ◽  
Alain Deffieux ◽  
Valdir Soldi ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Micellar Morphology

Effect of Composition and Molecular Structure of Poly(l-lactic acid)/Poly(ethylene oxide) Block Copolymers on Micellar Morphology in Aqueous Solution

Langmuir ◽  
2018 ◽  
Vol 34 (50) ◽  
pp. 15470-15482 ◽  
Author(s):  
Ekaterina V. Razuvaeva ◽  
Alevtina I. Kulebyakina ◽  
Dmitry R. Streltsov ◽  
Artem V. Bakirov ◽  
Roman A. Kamyshinsky ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Aqueous Solution ◽  
Lactic Acid ◽  
Block Copolymers ◽  
Ethylene Oxide ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Micellar Morphology

Regulation of the self-assembly morphology of azobenzene-bearing double hydrophobic block copolymers in aqueous solution by shifting the dynamic host–guest complexation

2015 ◽  
Vol 6 (12) ◽  
pp. 2214-2225 ◽  
Author(s):  
Zai-Zai Tong ◽  
Rui-Yang Wang ◽  
Jie Huang ◽  
Jun-Ting Xu ◽  
Zhi-Qiang Fan
Keyword(s):  
Aqueous Solution ◽  
Block Copolymers ◽  
Self Assembly ◽  
The Self ◽  
Complexation Equilibrium ◽  
Micellar Morphology

The complexation equilibrium between azo and β-CD can be shifted by various methods, thus the micellar morphology of azo-bearing block copolymers is altered.

Effect of pH on the Micellar Morphology of Semicrystalline PCL-b -PEO Block Copolymers in Aqueous Solution

2012 ◽  
Vol 213 (9) ◽  
pp. 952-964 ◽  
Author(s):  
Wei-Na He ◽  
Jun-Ting Xu ◽  
Bin-Yang Du ◽  
Zhi-Qiang Fan ◽  
Fang-Li Sun
Keyword(s):  
Aqueous Solution ◽  
Block Copolymers ◽  
Effect Of Ph ◽  
Micellar Morphology

The reaction of amorphous Ni-Nb films with Si in the presence of a native SiO2 layer

1990 ◽  
Vol 48 (4) ◽  
pp. 664-665
Author(s):  
N. Rozhanski ◽  
A. Barg
Keyword(s):  
High Temperature ◽  
Crystallization Temperature ◽  
Diffusion Barriers ◽  
Sio2 Layer ◽  
Si Substrate ◽  
Cross Sectional ◽  
Plan View ◽  
Temperature Range ◽  
Sputter Deposited

Amorphous Ni-Nb alloys are of potential interest as diffusion barriers for high temperature metallization for VLSI. In the present work amorphous Ni-Nb films were sputter deposited on Si(100) and their interaction with a substrate was studied in the temperature range (200-700)°C. The crystallization of films was observed on the plan-view specimens heated in-situ in Philips-400ST microscope. Cross-sectional objects were prepared to study the structure of interfaces.The crystallization temperature of Ni5 0 Ni5 0 and Ni8 0 Nb2 0 films was found to be equal to 675°C and 525°C correspondingly. The crystallization of Ni5 0 Ni5 0 films is followed by the formation of Ni6Nb7 and Ni3Nb nucleus. Ni8 0Nb2 0 films crystallise with the formation of Ni and Ni3Nb crystals. No interaction of both films with Si substrate was observed on plan-view specimens up to 700°C, that is due to the barrier action of the native SiO2 layer.

Scanning Transmission Electron Microscopy of Polyethylene Crystals

1980 ◽  
Vol 38 ◽  
pp. 242-245
Author(s):  
F. Khoury ◽  
L. H. Bolz
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Crystallization Temperature ◽  
Scanning Transmission Electron Microscopy ◽  
Growth Habit ◽  
Lateral Growth ◽  
Scanning Transmission Electron ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Growth Habits

The lateral growth habits and non-planar conformations of polyethylene crystals grown from dilute solutions (<0.1% wt./vol.) are known to vary depending on the crystallization temperature.1-3 With the notable exception of a study by Keith2, most previous studies have been limited to crystals grown at <95°C. The trend in the change of the lateral growth habit of the crystals with increasing crystallization temperature (other factors remaining equal, i.e. polymer mol. wt. and concentration, solvent) is illustrated in Fig.l. The lateral growth faces in the lozenge shaped type of crystal (Fig.la) which is formed at lower temperatures are {110}. Crystals formed at higher temperatures exhibit 'truncated' profiles (Figs. lb,c) and are bound laterally by (110) and (200} growth faces. In addition, the shape of the latter crystals is all the more truncated (Fig.lc), and hence all the more elongated parallel to the b-axis, the higher the crystallization temperature.

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.

Use of Nonionic Block Copolymers in Vaccines and Therapeutics

1998 ◽  
Vol 15 (2) ◽  
pp. 89-142 ◽  
Author(s):  
Mark J. Newman ◽  
Jeffrey K. Actor ◽  
Mannersamy Balusubramanian ◽  
Chinnaswamy Jagannath
Keyword(s):  
Block Copolymers
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