3 research outputs found
MODERNIZATION OF COLOR- FOUNDRY DEPARTMENTS: MODEM EQUIPMENT, MATERIALS, TECHNOLOGY
No full textThere are given some developments of ChP "SAS engineering company'' on modernization of equipment for melting of non-ferrous metals and alloys
Dehydration, Micellization, and Phase Separation of Thermosensitive Polyoxazoline Star Block Copolymers in Aqueous Solution
No full textSuitably end-functionalized
diblock copolymers (2-isopropyl-2-oxazoline)-b-(2-ethyl-2-oxazoline)
(PIPOZ-b-PEOZ)
were linked to a tetrafunctional core to synthesize two isomeric thermosensitive
4-arm star block polymers which have the PIPOZ block near the core,
core-(PIPOZ-b-PEOZ)4, or near the outer
surface the star polymer, core-(PEOZ-b-PIPOZ)4. The solution properties of the star copolymers in water
were monitored by turbidimetry, microcalorimetry, and small-angle
X-ray scattering (SAXS). The dehydration and cloud-point temperatures
of both core-(PIPOZ-b-PEOZ)4 and core-(PEOZ-b-PIPOZ)4 in water are in the vicinity of 50
°C. Above this temperature, core-(PIPOZ-b-PEOZ)4 forms starlike aggregates or star micelle, whereas core-(PEOZ-b-PIPOZ)4 remains isolated, with no sign of aggregation.
These results demonstrate the importance of chain architecture on
the association of thermosensitive tetra-arm star block copolymers
in water above the dehydration temperature
Multicomponent TiNi-based shape memory alloys : General considerations and selection rules for an initial precursor amorphous state
No full textGeneral considerations, which concern the development of new multicomponent shape memory alloys in an initial amorphous state, are discussed. The selection rules for the chemical compositions appropriate for production of both amorphous and potentially shape memory alloys are proposed on a basis of well known three "golden rules" and statements regarding the shape memory phenomena. The production and characterisation of the "AB"-type series amorphous potentially shape memory alloys with "A"=(Ti,Hf,Zr), "B"=(Ni,Cu,Co,Ag,Pd,Al) and the "A:B" ratio varied as 45:55, 50:50 and 55:45 are discussed. The material structure was followed by X ray diffraction and the thermodynamic properties and thermal stability were studied by Differential Scanning Calorimetry. Various heat treatments regimes have been explored for the formation of appropriate microstructures to demonstrate the shape memory property
