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Showing 1 to 12 of 12 for “"Strain induced crystallization"”.
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Strain-induced crystallization of crosslinked polyethylene
The kinetics of strain-induced crystallization of ultra high molecular weight polyethylene (UHMWPE) in both the dry and swollen states have been studied using a digital imaging technique coupled with dynamometry. Polymer fibers obtained by spinning a gel of polyethylene in paraffin oil were lightly …
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Mechanochromism and Strain-Induced Crystallization in Thiol-yne-derived Stereoelastomers
<p>Most elastomers undergo strain-induced crystallization (SIC) under tension; as individual chains are held rigidly in a fixed position by an applied strain, their alignment along the strain field results in a shift from strain-hardening (SH) to SIC, a sub-type of SH. A similar degree of …
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The mechanics of strain-induced crystallization in poly(ethylene terephthalate)
… PET exhibits the capability of undergoing strain-induced crystallization during processing, the result of which is increased stiffness and hardness as well as better dimensional stability. An experimental study of the strain rate, strain state, and temperature dependencies of the …
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Polymer structure and property studies in elongational rheology, spherulite deformation, and biaxial strain induced crystallization
… and immiscible at 120,000 molecular weight. Strain hardening and the level of strain induced crystallization which occurred in the biaxial deformation of poly(lactic acid) blend films were found to be contingent on the concentration of optically active poly(L-lactic acid). Temperature, …
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Elastocaloric properties of Natural Rubber for Solid-State Cooling Technologies
… synergistic contribution of thermoelasticity and strain-induced crystallization. Nevertheless, research on the refrigeration potential of natural rubber is still in its infancy, and not all parameters influencing the elastocaloric behaviour of this material are fully understood. In particular, …
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Crystallization kinetics of polymer melts in extensional flow
A technique to study the kinetics of flow-induced crystallization of polymers in extensional flow has been developed which uses a 4-Roll Mill. The kinetics of a High Density Polyethylene were found to be well described by the Avrami treatment, indicated that the crystallization occurred by sporadic …
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Oriented polymer crystal growth from flowing solutions
The kinetics of dilute solution flow-induced crystallization in a tubular flow geometry have been quantified for several polymer systems using digital image processing to observe and monitor the birefringence of the crystallizing fiber. Three molecular weights of polyethylene were studied in 0.01 …
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A study of transient flow-induced crystallization of polymer melts
Flow-induced crystallization of several polymer systems has been studied using a four-roll mill device, coupled with optical polarimetry, to provide an in-situ technique for monitoring the transformation kinetics both during and following flow. The use of a crystallizable droplet phase, suspended …
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Modelling the constitutive behaviour of poly(ethylene terephthalate) for the stretch blow moulding process
… behaviour of aPET subject to an arbitrary strain history, and to develop a new material characterization method providing new data for the deformation behaviour of aPET relevant to the SBM process.<br/><br/>In order to achieve this goal, a reliable, robust and non-touch characterization …
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Synthesis and Properties of Novel Triptycene-containing Segmented Polyurethanes and Semicrystalline Polysulfone-polyester Multiblock Copolymers
… temperature (Tg) and an elimination of the crystallization of the soft segments. The absence of strain hardening for the triptycene-containing sample suggested a suppressed strain induced crystallization of soft segments, which was also confirmed by the analysis of wide-angle X-ray …
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Investigation of the Influence of Selected Variables on the Solid State Structure-Property Behavior of Segmented Copolymers
… with others are hard segment crystallizability, crystallization conditions, hard segment content, soft segment type and molecular weight, nature of hydrogen bonding, extent of inter-segmental hydrogen bonding, segment symmetry, and chain architecture. In poly(ether-block-amide)s, it was found …