Small-angle neutron scattering and differential scanning calorimetry studies on the copper clustering stage of Fe–Si–B–Nb–Cu nanocrystalline alloys

2000 ◽  
Vol 48 (20) ◽  
pp. 4783-4790 ◽  
Author(s):  
M Ohnuma ◽  
K Hono ◽  
S Linderoth ◽  
J.S Pedersen ◽  
Y Yoshizawa ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Nanocrystalline Alloys ◽  
Scanning Calorimetry

Small-angle neutron scattering and differential scanning calorimetry study of associative behaviour of branched poly(ethylene oxide)/poly(propylene oxide) copolymer in aqueous solution

2003 ◽  
Vol 36 (4) ◽  
pp. 970-975 ◽  
Author(s):  
J. Pleštil ◽  
H. Pospíšil ◽  
A. Sikora ◽  
I. Krakovský ◽  
A. I. Kuklin
Keyword(s):  
Differential Scanning Calorimetry ◽  
Ethylene Oxide ◽  
Neutron Scattering ◽  
Propylene Oxide ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Scanning Calorimetry ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Poly Propylene

Tetronic RED 9040, a reverse-type [poly(propylene oxide) as terminal blocks] octablock star copolymer with four poly(ethylene oxide)/poly(propylene oxide) arms attached to the ethylenediamine core was studied in D2O at concentrations between 1 and 60 g dL−1in the temperature range from 283 to 353 K. Depending on concentration and temperature, various structures (unimers, random network, micelles, micellar aggregates, micellar networks) were indicated by small-angle neutron scattering (SANS). Some structure characteristics of unimers, micelles and micellar networks have been determined by fitting model scattering functions to the SANS data. A competition between the increasing association number and dehydration of the micelles is suggested as a possible explanation of the observed non-monotonic temperature dependence of the structure parameters of concentrated systems. A partial phase diagram was suggested on the basis of SANS and differential scanning calorimetry (DSC) data and visual inspection of the solutions.

A Deformation-Induced Phase Separation in the Solid State

1986 ◽  
Vol 79 ◽  
Author(s):  
J. M. Lefebvre ◽  
R. S. Porter ◽  
G. D. Wignall
Keyword(s):  
Differential Scanning Calorimetry ◽  
Phase Separation ◽  
Solid State ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Scanning Calorimetry

AbstractAmorphous Polymethylmethacrylate/Polyethyleneoxide blends deformed by solid-state coextrusion exhibit anomalous anisotropic Small Angle Neutron scattering patterns in the low q range. It is shown that upon drawing the samples have undergone phase separation to some extent. The resulting structure of the system is characterized by combining scattering techniques with Differential Scanning Calorimetry.

Phase Separation In Blends of Polystyrene and Poly (P-METHYLSTYRENE) Using Thermal Analysis And Small-Angle Neutron Scattering

1993 ◽  
Vol 321 ◽  
Author(s):  
A. Xenopoulos ◽  
J. D. Londono ◽  
G. D. Wígnall ◽  
B. Wunderlich
Keyword(s):  
Thermal Analysis ◽  
Phase Separation ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Small Difference ◽  
Glass Transitions ◽  
Scanning Calorimetry ◽  
Reliable Detection ◽  
Sans Data

ABSTRACTDifferential scanning calorimetry (DSC) was used to study blends of polystyrene (PS) and poly (p-Methylstyrene) (PpmS). The presence of two glass transitions on heating after quenching was interpreted as evidence of phase separation at the temperature of the liquid before quenching. The small difference between the glass transitions of the homopolymers in the PS/PpmS system of “13 K limits the reliable detection of double glass transitions for blends to concentrations between 30 and 70%. The results of the DSC technique are supported by comparison with small angle neutron scattering (SANS) data.

Small-angle neutron scattering study on FeCuNbSiB nanocrystalline alloys

1995 ◽  
Vol 213-214 ◽  
pp. 582-584 ◽  
Author(s):  
M. Ohnuma ◽  
J. Suzuki ◽  
S. Funahashi ◽  
T. Ishigaki ◽  
H. Kuwano ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Nanocrystalline Alloys ◽  
Scattering Study ◽  
Neutron Scattering Study

scholarly journals Morphology of crystalline–amorphous olefin block copolymers in solution characterized by small-angle neutron scattering and microscopy

2015 ◽  
Vol 48 (6) ◽  
pp. 1860-1869 ◽  
Author(s):  
Aurel Radulescu ◽  
Günter Goerigk ◽  
Lewis Fetters ◽  
Dieter Richter
Keyword(s):  
Block Copolymers ◽  
Neutron Scattering ◽  
Small Angle ◽  
Self Assembly ◽  
Small Angle Neutron Scattering ◽  
Chain Structure ◽  
Hierarchical Organization ◽  
Single Chain ◽  
Scanning Calorimetry ◽  
Assembly Behavior

The single-chain properties and self-assembly behavior in dilute solution of olefin block copolymers obtained by chain-shuttling technology and consisting of alternating crystallizable and amorphous ethylene/1-octene blocks were investigated by pinhole and focusing small-angle neutron scattering techniques, optical microscopy in bright-field and crossed-polarizer modes, and differential scanning calorimetry. The complex hydrocarbon soluble (precipitant free) macro-aggregates formed with decreasing temperature are characterized by spherulitic textures. The spherulites yield, on one hand, a morphology that depends on the chain structure properties and, on the other hand, multiple structural levels with a hierarchical organization that ranges from 10 Å up to tens of micrometres. This morphology displays peculiarities dictated by the polydisperse character of these materials.

Small Angle Neutron Scattering Studies on Miscibility of Polystyrene and Tetramethyl-Bisphenol A-Polycarbonate Blends

1986 ◽  
Vol 79 ◽  
Author(s):  
Hsinjin Yang ◽  
J. N. O'Reilly
Keyword(s):  
Bisphenol A ◽  
Neutron Scattering ◽  
Interaction Parameter ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Random Phase ◽  
Segment Length ◽  
Scanning Calorimetry ◽  
Bisphenol A Polycarbonate ◽  
Dsc Measurements

AbstractThe miscible blend of polystyrene (PSH) and tetramethyl-bisphenol A-polycarbonate (TMPC) has been previously studied by differential scanning calorimetry (DSC), viscoelasticity, and microscopy. In this study, small-angle neutron scattering (SANS) has been applied to obtain the quantitative interaction parameter (X) of this blend at room temperature. Deuterated polystyrene (PSD) was used for the scattering contrast in the study. The PSD/TMPC blends show a single Tg over the whole range of composition from the DSC measurements, whicg is the same as the Tg of PSH/TMPC blend.The interaction parameter was calculated from the de Gennes scattering intensity function of miscible polymer blends, which is based on the random phase approximation. As expected for a miscible system, all X values are negative over the range of composition. It is also found that the X is composition-dependent. Furthermore, the correlation length of the concentration fluctuation is approximately twice the segment length 21–32 Å of the component polymer (PSD = 6.7 Å and TMPC = 18.3 Å), implying that the mixing of this blend is effectively at segmental level.

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