Plastic Deformation of Crystalline Polymers in Solid-State Extrusion through a Tapered Die

1973 ◽  
pp. 353-380 ◽  
Author(s):  
M. Takayanagi
Keyword(s):  
Plastic Deformation ◽  
Solid State ◽  
Crystalline Polymers

Structure-property relations of liquid crystalline polymers

1987 ◽  
Vol 45 ◽  
pp. 460-463
Author(s):  
Linda C. Sawyer
Keyword(s):  
Solid State ◽  
Liquid Crystalline ◽  
Structural Model ◽  
Crystalline Polymer ◽  
Liquid Crystalline Polymers ◽  
Mechanical Anisotropy ◽  
Structure Property ◽  
Preparation Methods ◽  
Crystalline Polymers ◽  
Extended Chain

Recent liquid crystalline polymer (LCP) research has sought to define structure-property relationships of these complex new materials. The two major types of LCPs, thermotropic and lyotropic LCPs, both exhibit effects of process history on the microstructure frozen into the solid state. The high mechanical anisotropy of the molecules favors formation of complex structures. Microscopy has been used to develop an understanding of these microstructures and to describe them in a fundamental structural model. Preparation methods used include microtomy, etching, fracture and sonication for study by optical and electron microscopy techniques, which have been described for polymers. The model accounts for the macrostructures and microstructures observed in highly oriented fibers and films.Rod-like liquid crystalline polymers produce oriented materials because they have extended chain structures in the solid state. These polymers have found application as high modulus fibers and films with unique properties due to the formation of ordered solutions (lyotropic) or melts (thermotropic) which transform easily into highly oriented, extended chain structures in the solid state.

Plastic Deformation of Some Polymers in Solid State Extrusion

1971 ◽  
Vol 20 (212) ◽  
pp. 606-609 ◽  
Author(s):  
Kiyohisa IMADA ◽  
Tuneo YAMAMOTO ◽  
Kenji KANEKIYO ◽  
Motowo TAKAYANAGI
Keyword(s):  
Plastic Deformation ◽  
Solid State

Solid-state plastic deformation in the dynamic interior of a differentiated asteroid

2013 ◽  
Vol 6 (2) ◽  
pp. 93-97 ◽  
Author(s):  
B. J. Tkalcec ◽  
G. J. Golabek ◽  
F. E. Brenker
Keyword(s):  
Plastic Deformation ◽  
Solid State

Solid state reactions in the CuZn system induced by plastic deformation at room temperature

1988 ◽  
Vol 145 ◽  
pp. 261-270 ◽  
Author(s):  
S. Martelli ◽  
G. Mazzone ◽  
S. Scaglione ◽  
M. Vittori
Keyword(s):  
Plastic Deformation ◽  
Solid State ◽  
Room Temperature ◽  
Solid State Reactions

Development of light-emitting liquid-crystalline polymers with a pentafluorinated bistolane-based luminophore

2020 ◽  
Vol 44 (15) ◽  
pp. 5684-5691 ◽  
Author(s):  
Shigeyuki Yamada ◽  
Akira Mitsuda ◽  
Kaoru Adachi ◽  
Mitsuo Hara ◽  
Tsutomu Konno
Keyword(s):  
Phase Transition ◽  
Solid State ◽  
Liquid Crystalline ◽  
Dynamic Change ◽  
Liquid Crystalline Polymers ◽  
Light Emitting ◽  
Light Blue ◽  
Crystalline Polymers ◽  
Thermal Phase Transition ◽  
Thermal Phase

Light-emitting liquid-crystalline polymers showing PL in the pristine solid state can control their PL color from blue to light-blue via a thermal phase transition to LC phases, which originates from a dynamic change of aggregated structures.

Characterization o Solid-State Vortices Associated with the Friction-Stir Welding of Copper to Aluminum

1998 ◽  
Vol 4 (S2) ◽  
pp. 530-531
Author(s):  
R. D. Flores ◽  
L. E. Murr ◽  
E. A. Trillo
Keyword(s):  
Plastic Deformation ◽  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
Solid State ◽  
Weld Zone ◽  
Thick Plates ◽  
6061 Aluminum Alloy ◽  
Friction Stir ◽  
The Past ◽  
Joining Process

Although friction-stir welding has been developing as a viable industrial joining process over the past decade, only little attention has been given to the elucidation of associated microstructures. We have recently produced welds of copper to 6061 aluminum alloy using the technique illustrated in Fig. 1. In this process, a steel tool rod (0.6 cm diameter) or head-pin (HP) traverses the seam of 0.64 cm thick plates of copper butted against 6061-T6 aluminum at a rate (T in Fig. 1) of 1 mm/s; and rotating at a speed (R in Fig. 1) of 650 rpm (Fig. 1). A rather remarkable welding of these two materials results at temperatures measured to be around 400°C for 6061-T6 aluminum welded to itself. Consequently, the metals are stirred into one another by extreme plastic deformation which universally seems to involve dynamic recrystallization in the actual weld zone. There is no melting.

EXPERIMENTAL INVESTIGATION OF CHALCOCITE: ANNEALING AND PLASTIC DEFORMATION AT ELEVATED TEMPERATURES

1965 ◽  
Vol 2 (2) ◽  
pp. 98-117
Author(s):  
Raymond Davies
Keyword(s):  
Experimental Investigation ◽  
Plastic Deformation ◽  
Solid State ◽  
Grain Growth ◽  
Annealing Time ◽  
Silica Glass ◽  
Elevated Temperatures ◽  
Recrystallization Behavior ◽  
Vapor Pressures ◽  
Sulfur Vapor

The recrystallization behavior and deformation of synthetic chalcocite (Cu2S) in the temperature range 400–725 °C was studied microscopically after the compound was annealed in evacuated silica glass capsules and heated under differential pressures in sealed gold capsules. The temperature of recrystallization and grain growth ascribed to the hexagonal cubic inversion, at sulfur vapor pressures much less than 1 atmosphere, was determined at 465 ± 5 °C, with annealing time of [Formula: see text].Experiments involving differential pressures of 8 000 p.s.i. show that chalcocite in the solid state becomes considerably more mobile above 563 ± 10 °C and can readily be injected as a plastic mass to form veins without preservation of deformational textures.Natural bornite and natural galena may also be injected under differential pressure at 640 °C, but some unhealed fractures remain. Flow structure is well-preserved in galena and, under certain conditions, in bornite.Mixtures of bornite and pyrite flowed and recrystallized to chalcopyrite and bornite with exsolved chalcopyrite. No evidence of flowage remained.Chalcopyrite and pyrrhotite are resistant to injection under similar differential pressures and temperatures.

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