Study of the crystallization process of oriented poly(ethylene terephthalate) by means of synchrotron radiation

Elsner, Gerhard; Zachmann, H. G.; Milch, James R.

doi:10.1002/macp.1981.021820235

Cited by 38 publications

(13 citation statements)

References 11 publications

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“…As is known [19], the azimuthal half-width of the SAXS reflection decreases during crystallization. This causes an additional increase in the scattering power on the meridian.…”

Section: Experimental Methodsmentioning

confidence: 96%

Influence of catalysts on the rate of crystallization and on the crystal distortions in poly(ethylene terephthalate)

Asano¹,

Dzeick-Pickuth²,

Zachmann³

1989

J Mater Sci

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The crystallization behaviour of poly(ethylene terephthalate) (PET) containing different amounts of catalysts as well as of PET without catalysts has been studied. The kinetics of crystallization from the glassy state has been investigated by time-resolved small-angle X-ray scattering employing synchrotron radiation. The degree of crystallinity and Ruland's lattice distortion factor k were measured by wide-angle X-ray scattering. The results show that not only calcium acetate but also manganese acetate acts as a nucleating agent in PET. If the crystallization takes place close to the glass transition temperature, the catalysts also influence the amount of lattice distortions: the larger the nucleating effect, the smaller the factor k. This is explained by the fact that, due to restricted motion of the molecules, the amount of lattice distortion of the crystals within a spherulite increases with increasing distance from the centre of the spherulite.

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“…As is known [19], the azimuthal half-width of the SAXS reflection decreases during crystallization. This causes an additional increase in the scattering power on the meridian.…”

Section: Experimental Methodsmentioning

confidence: 96%

Influence of catalysts on the rate of crystallization and on the crystal distortions in poly(ethylene terephthalate)

Asano¹,

Dzeick-Pickuth²,

Zachmann³

1989

J Mater Sci

Self Cite

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“…The decrease in L at long times has recently been reported by time-resolved SAXS techniques in many polymers: poly(ethylene terephthalate) (PET), 20,21 poly(aryletheretherketone) (PEEK), 11,22,23 isotatic polypropylene (iPP), 24 and ethylene 1-octene copolymer. 25 This behavior again can be attributed to the secondary crystallization process (after spherulites impinge) through the lamellar stack-insertion mechanism.…”

Section: Effect Of Miscible Polymer Diluents On Lamellar Morphologymentioning

confidence: 98%

Effect of miscible polymer diluents on the development of lamellar morphology in poly(oxymethylene) blends

Yeh

Hsiao

Chu

et al. 1999

J. Polym. Sci. B Polym. Phys.

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“…Other work such as annealing studies on single crystals [24] has shown that poly(TMPS) thickening occurs only to a limited extent (X 2) and then only with some difficulty4). Polyhexamethyleneadipate [25] and polyethyleneterephthalate [6,26] are examples of polymers with large monomer repeat units, where crystal thickening seems to be cumbersome. It is likely then that is one reason for the absence of secondary crystallization in poly(TMPS), except at the high temperatures and long times used in dilatometry.…”

Section: A) Kinetic Resultsmentioning

confidence: 99%

“…Specifically small-angle x-ray scattering (SAXS), carried out in situ using supercooled melts, ISSAXS, enables one to study the development of lamellar spherulitic textures at both short and long times, even though there are time and resolution restrictions here. The validity of the method has been documented recently for polyethylene [2][3][4][5] and polyethylene terephthalate [6][7][8][9] isothermal crystallization from the supercooled melt.…”

Section: Introductionmentioning

confidence: 99%

In situ SAXS investigations of isothermal crystallization in poly(TMPS) fractions

Magill

Schultz

Lin

1987

Colloid & Polymer Sci

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Abstract:The isothermal crystallization kinetics of poly(TMPS) has been measured by ISSAXS and results obtained for a molecular weight fraction (21,000) below the critical entanglement molecular weight (25,000) and another one above it (371,000). The SAXS intensity vs. time curves suggest that a single transformation mechanism exists. The SAXS long period is independent of crystallization time for both poly(TMPS) fractions. However the interlamellar thickness contribution to the long period is dependent upon molecular weight and crystallization temperature, increasing with temperature and molecular weight. The crystallite contribution also increases over the range studied. Both fractions exhibit a significant, but reversible decrease in thickness on cooling the sample from the crystallization temperature to room temperature and recyling again. The change is more pronounced for 371,000 specimen in keeping with its lower crystallinity. The path dependence of lamellar dimensions has significant implications in the morphological characterization of polymers annealed or crystallized at one temperature and then measured at another one.

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Study of the crystallization process of oriented poly(ethylene terephthalate) by means of synchrotron radiation

Cited by 38 publications

References 11 publications

Influence of catalysts on the rate of crystallization and on the crystal distortions in poly(ethylene terephthalate)

Influence of catalysts on the rate of crystallization and on the crystal distortions in poly(ethylene terephthalate)

Effect of miscible polymer diluents on the development of lamellar morphology in poly(oxymethylene) blends

In situ SAXS investigations of isothermal crystallization in poly(TMPS) fractions

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