Small angle x-ray diffraction studies of PET fibres

Sfiligoj, M. S.; Zipper, Peter; Jeler, Slava

doi:10.1007/bf01188931

Cited by 4 publications

(4 citation statements)

References 16 publications

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“…[8]). Small angle X-ray analyses of SCF treated PET fibers, unveiling an increase in the volume of the microvoid system, point in the same direction [21].…”

Section: Resultsmentioning

confidence: 99%

WAXS analysis of structural changes of poly(ethylene terephthalate) fibers induced by supercritical-fluid dyeing

Sfiligoj

Zipper

1998

Colloid & Polymer Science

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Supercritical CO fluid, a new environmentally friendly dyeing medium, changes the fiber structure to a certain extent in dependence on the treatment temperature and pressure used. Therefore the changes of crystalline structure in poly(ethylene terephthalate) (PET) fibers as brought about under the influence of supercritical CO fluid were investigated. For the data collection of wideangle X-ray diffraction full patterns a two-circle goniometer, equipped with a position sensitive detector, was used. From the observed twodimensional fiber diffraction patterns the crystallinities of various treated fibers were evaluated. The equatorial scanning yielded the dimensions of crystallites. To elucidate the fibersurface morphology changes SEM analyses were performed.The supercritical fluid dyeing of PET fibers with highly developed microfibrillar structure under tautends conditions promotes changes which are characterized by an increase in crystallinity and by diminution of the apparent crystallite dimensions. Some changes of surface morphology of dyed fibers were observed as well.

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“…[8]). Small angle X-ray analyses of SCF treated PET fibers, unveiling an increase in the volume of the microvoid system, point in the same direction [21].…”

Section: Resultsmentioning

confidence: 99%

WAXS analysis of structural changes of poly(ethylene terephthalate) fibers induced by supercritical-fluid dyeing

Sfiligoj

Zipper

1998

Colloid & Polymer Science

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“…The morphology of PET, PBS, their composites and blends have been widely studied by X‐ray diffraction techniques . In this work the microstructure of neat PBS, postconsumer PET and their copolymers was investigated with SAXS and WAXS.…”

Section: Resultsmentioning

confidence: 99%

“…The morphology of PET, PBS, their composites and blends have been widely studied by X-ray diffraction techniques. [16][17][18][19][20][21][22] In this work the microstructure of neat PBS, postconsumer PET and their copolymers was investigated with SAXS and WAXS. Figures 11 and 12 show the SAXS and WAXS patterns of homoand copolyesters crystallized at 100 C. Both PBS and PET show broad peaks, indicating fairly well lamellar stacks in these homopolymers.…”

Section: X-ray Diffraction Studymentioning

confidence: 99%

Thermoplastic elastomers derived from bio‐based monomers

Ghassemi

Schiraldi

2013

J of Applied Polymer Sci

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Series of copolyesters based on poly(propylene succinate) (PPS) and poly(butylene succinate) (PBS), which can be produced from biological feedstock, and postconsumer poly(ethylene terephthalate) (PET) were synthesized with the aim of developing sustainable materials, which combine the mechanical properties of high performance elastomers with those of flexible plastics. The aliphatic polyesters were synthesized by the catalyzed two‐step transesterification reaction of dimethyl succinate, 1,3‐propanediol, and 1,4‐butanediol followed by melt reaction with PET in bulk. The content of PET segments in the polymer chains was varied from about 10 to 100 wt % per 100 wt % PPS or PBS. The effect of the introduction of the PET segments on the structure, thermal, physical, and mechanical properties was investigated. The composition and structure of these aliphatic/aromatic copolyesters were determined by NMR spectroscopy. The thermal properties were investigated using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The level of crystallinity was studied by means of DSC and wide‐angle X‐ray scattering. A depression of melting temperature and a reduction of crystallinity of copolyesters with increasing content of PET segments were observed. Consequently, the tensile modulus and strength of copolyesters decreased, and the elongation at break increased with PET content in the range of 10−50 wt %. Thus, depending on PET content, the properties of copolyesters can be tuned ranging from semicrystalline polymers possessing good tensile modulus (380 MPa) and strength (24 MPa) to nearly amorphous polymer of high elongation (∼800%), and therefore they may find applications in thermoplastics as well as elastomers or impact modifiers. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 39815.

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“…The experimental data were corrected for absorption and background scattering. According to Bragg's law, the long period, i.e., the average distance between crystalline regions which alternate with amorphous domains in the two-phase fibre model was determined from the position of the (first) scattering maximum [17,19,21]. The distance between the bundle of fibres and the plane of registration was 21 cm when equatorial scattering was studied [22].…”

Section: Determination Of Fibre Structurementioning

confidence: 99%

Structure-properties relationship of poly(ethylene terephthalate) wool-type fibres

2008

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Two PET wool-type fibres were studied for this research, i.e. a normal wool-type and a low-pilling modification. The structural morphology and crystalline orientation of the fibres were investigated by means of wide-angle x-ray scattering (WAXS), density measurements and infrared (IR) spectroscopy. The degree of crystallinity, crystallite orientation, apparent crystallite dimensions and micro-void system were determined by x-ray scattering. Birefringence measurements were used to study the average molecular orientation and the orientation of macromolecular chain segments in the amorphous regions. In addition, PET samples were conventionally dyed and the effect of the structure on colour was followed using colorimetry. Significant differences between the two PET wool fibre types were observed; i.e. crystallinity is higher for the standard PET wool fibre type, the crystallites are slightly larger and better oriented, long periods are larger, the orientation of molecular segments in non-crystalline phase is higher, and bigger voids are formed. The observed structure gives rise to fibres higher tenacity and higher bending stiffness.

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Small angle x-ray diffraction studies of PET fibres

Cited by 4 publications

References 16 publications

WAXS analysis of structural changes of poly(ethylene terephthalate) fibers induced by supercritical-fluid dyeing

WAXS analysis of structural changes of poly(ethylene terephthalate) fibers induced by supercritical-fluid dyeing

Thermoplastic elastomers derived from bio‐based monomers

Structure-properties relationship of poly(ethylene terephthalate) wool-type fibres

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