A device for studies of the early stages of post-spinning crystallization in polymer fibres

Hristov, Hristo; Schultz, J. M.

doi:10.1016/0032-3861(88)90046-8

Cited by 7 publications

(4 citation statements)

References 17 publications

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“…The time required to bring the fiber to the treatment temperature was in the interval 14-18 ms, corresponding to a heating rate of -lo4 deg/s (ref. 10). Although experiments were performed in a temperature interval from 22-240°C, most of the measurements are in the range 100-140°C ( Tg -7OoC).…”

Section: Equipment a N D Materialsmentioning

confidence: 99%

Rapid mechanical deformation of poly(ethylene terephthalate) fibers at temperatures above the glass transition

Hristov¹,

Hearle²,

Schultz³

et al. 1995

J Polym Sci B Polym Phys

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The mechanical properties of poly(ethylene terephthalate) (PET) fibers at temperatures above the glass transition are investigated by means of a specially constructed device. Measurements of the deformation rate and of the “dynamic” stress‐strain curves of the fibers are performed in nearly isothermal regime (after initial rapid heating) in a temperature interval 100–200°C. The results reported in the present work demonstrate that the high‐temperature mechanical characteristics of rapidly crystallizing polymers can be deduced to a satisfactory precision, while keeping the crystallinity development at low level. Our investigations indicate that if the high‐temperature deformation is sufficiently fast, the polymer behavior is similar to the deformation at sub‐Tg temperatures. Based on this similarity, a qualitative model of the deformation in the high‐temperature region is proposed. The proposed model is fundamentally equivalent to the models describing mechanical deformation of glassy polymers at temperatures below the glass transition. ©1995 John Wiley & Sons, Inc.

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Section: Equipment a N D Materialsmentioning

confidence: 99%

Rapid mechanical deformation of poly(ethylene terephthalate) fibers at temperatures above the glass transition

Hristov¹,

Hearle²,

Schultz³

et al. 1995

J Polym Sci B Polym Phys

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“…A more precisely defined mechanism has not been proposed. The transformation kinetics must become governed by the rate at which the heat of fusion can be removed. Suppose that crystallization is taking place at a velocity of 75 cm/s, as directly observed in postspinning treatment of PET fibers . With a thermal diffusivity of 6 × 10 –4 cm 2 /s, the thermal diffusion length will be somewhat less than 10 nm.…”

Section: Pattern Formation During Fiber Spinning: a Role Of Thermal F...mentioning

confidence: 99%

“…An analogous procedure can be used to simulate the effect of the release of the heat of fusion on spherulite development . Figure shows the simulation of the growth of a pure syndiotactic polystyrene spherulite growing at 100 °C.…”

Section: Treatments Of the Growth Of Polymer Spherulitesmentioning

confidence: 99%

Self-Generated Fields and Polymer Crystallization

Schultz

2012

Macromolecules

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The creation of thermal, compositional, and stress fields during the crystallization of polymers from the melt is described. The treatment of crystallization under self-generated fields is reviewed, including classical moving boundary problems, the treatment of dendrite growth, and coupled growth. The extension of these treatments to polymer crystallization requires that the velocity of interface motion be defined by the temperature and composition of the melt at the solid−liquid interface, a feature not found in extant analyses suitable for small-molecule systems and metals. Inclusion of this feature renders analytical solutions difficult and usually requires the use of numerical methods. The role of the diffusion length in defining morphological features is described. Methods of simulating the growth of polymer spherulites are reviewed. These include finite element, analytical, and phase field approaches. The role of thermal fields in fiber processing is discussed. Finally, speculations regarding the role of stress fields are presented.

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“…Figure 1 and from as-spun fibres [7,8], which are oriented but noncrystalline, as a function of temperature. The fibre heat-treatments were performed under different axial stresses, as indicated in the figure.…”

Section: Introductionmentioning

confidence: 99%

Structure Development in Highly Oriented PET

Schultz¹

1996

Oriented Polymer Materials

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A device for studies of the early stages of post-spinning crystallization in polymer fibres

Cited by 7 publications

References 17 publications

Rapid mechanical deformation of poly(ethylene terephthalate) fibers at temperatures above the glass transition

Rapid mechanical deformation of poly(ethylene terephthalate) fibers at temperatures above the glass transition

Self-Generated Fields and Polymer Crystallization

Structure Development in Highly Oriented PET

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