Poly(ethylene terephthalate) fibres with improved mechanical properties

Sarkisova, M. Kh.; Петрович, Сазанов Вячеслав; Fakirov, S.

doi:10.1002/actp.1992.010430303

Cited by 4 publications

(6 citation statements)

References 18 publications

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“…This observation has received support from the studies of a number of research workers. [63][64][65] PET fibers with birefringence of 0.26 or higher [65][66][67][68] have been produced, thus confirming that ⌬nco for these fibers would be much higher than its usually accepted value.…”

Section: Optical Propertiesmentioning

confidence: 86%

“…In PET, however, Evstatiev et al 67 have shown that the most favorable structure for the achievement of high orientation is the crystalline structure but an imperfect one. There are important differences in the development of orientation in polyethylene and PET, as pointed out by Ward. 75 The development of orientation in PET is not pseudo affine but rather that of a stretched network and the crystalline and amorphous regions in PET are all-trans and trans/ gauche, respectively.…”

Section: Effect Of Setting Conditions and Fiber Structurementioning

confidence: 99%

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Heat setting

Gupta¹

2001

J of Applied Polymer Sci

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As-manufactured polymeric fibers are oriented semi-crystalline structures in which the macromolecules are rarely in their equilibrium state. Further instabilities are imparted when the fibers are converted to yarns and the yarns to fabrics. Heat setting is an important industrial process, since it rids them of their instabilities. This review article first considers aspects that are relevant to the broad area of heat setting, viz., the origin of instability, the durability of set, thermal and dynamic mechanical transitions, thermodynamic basis of setting, shrinkage and shrinkage stress, and characterization of the degree of set. The heat setting of major thermoplastic fibers, viz., polyester, polyamide, polyacrylonitrile, polypropylene, and polyethylene has been described in terms of the conditions of heat setting, the structural and morphological changes that occur on heat setting, and the changes in their physical properties. It is shown that heat setting affects such important properties as stress-strain and recovery behavior, dye-uptake, optical properties, and thermal properties. The structural and morphological changes have been described in terms of changes in crystallinity, crystal size and their size distribution, crystal defects, crystal orientation, the nature of the amorphous phase and its orientation, the coupling of the crystalline and amorphous phases, etc. The structural basis of property changes is then discussed.

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Section: Optical Propertiesmentioning

confidence: 86%

Section: Effect Of Setting Conditions and Fiber Structurementioning

confidence: 99%

Heat setting

Gupta¹

2001

J of Applied Polymer Sci

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“…After removal from the extruder (2-mm capillary die), the extrudate was immediately cooled down to 85 C and drawn by a stretching device, as described before. 6,20,21 The draw ratio defined as the ratio between the cross-sectional areas of the drawn strand, and the die was kept at 10.…”

Section: Sample Preparationmentioning

confidence: 99%

“…As is well known, during cold drawing of the extrudates of the immiscible polymer blends, both phases transform into fibrils. [2][3][4][5][6]20,21,24,25 To get better information about the size and aspect ratio of the PET fibrils in the drawn strands, the PP phase was removed by hot xylene. Figure 2(a) shows the microphotograph of the PET fibrils with the diameters in a range of 0.5-1.5 lm and a high aspect ratio.…”

Section: Morphology Of Pet Fibrilsmentioning

confidence: 99%

Study of PET/PP/TiO₂ microfibrillar‐structured composites, part 1: Preparation, morphology, and dynamic mechanical analysis of fibrillized blends

Schlarb

Evstatiev

2009

J of Applied Polymer Sci

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The objective of this study was to manufacture and investigate a novel microfibrillar-reinforced material based on fibrillized blends of polyethyleneterephthalate (PET), polypropylene (PP), and TiO 2 nanoparticles (300 nm and 15 nm in size). The uncompatibilized and compatibilized blends (polypropylene grafted maleic anhydride as compatibilizer) were extruded and subsequently cold-drawn into strands with a draw ratio of 10. The effects of compatibilizer and TiO 2 particles on the structure and properties of drawn strands were investigated. Upon addition of compatibilizer, the preferential location of TiO 2 particles shifted from the PET-dispersed phase to the PP matrix, which brought about different structures of the drawn strands. Differential scanning calorimetry study provided indications for a heterogeneous nucleation effect of the PET fibrils on the PP matrix and of the TiO 2 particles on the PET fibrils. Dynamic mechanical analysis demonstrated that the mechanical properties of the drawn strands are strongly dependent on the strand structures.

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“…The melt at 31OOC was quenched at a rate of 400°C/min [33]. According to WAXS and DSC measurements, the strips obtained were amorphous [33,37]. The results of mechanical tests of the PBT/PET blend (1:l by wt.)…”

Section: Ultraquenching Of Polymer Blendsmentioning

confidence: 99%

Alternative Approaches to Highly Oriented Polyesters and Polyamides with Improved Mechanical Properties

Fakirov¹

1996

Oriented Polymer Materials

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General considerationsThe development of high performance polymer materials is one of the main subjects in contemporary materials science. Such polymers are distinguished by a structure usually involving (i) maximal orientation of macromolecules, (ii) perfect crystallites built up of extended chains and (iii) a relatively high molecular weight of the polymer.There are two principal and basically different approaches to the realization of high modulus and high stregth polymer materials: synthesis of new polymers with "tailored" properties and structural modification of known and widely applied polymers.Liquid crystalline (lyotropic and thermotropic) polymers represent a good illustration of the successful synthesis of new types of materials. Despite their excellent mechanical properties, this new class of polymers still has limited practical application, mainly due to high production costs [l] (see Chapter 17).The methods based on structural modification of commercial polymers are much more accessible. They can be classified as cold or hot drawing [1,2], solid state extrusion [l-31, zone drawing [4,5] (see Chapter 13) and rapid drawing from melts or solutions [1,6,7]. These mechanical and/or thermal treatments result in transformation of the isotropic structure into Oriented Polymer Material> Stoyko Fakirov

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Poly(ethylene terephthalate) fibres with improved mechanical properties

Cited by 4 publications

References 18 publications

Heat setting

Heat setting

Study of PET/PP/TiO₂ microfibrillar‐structured composites, part 1: Preparation, morphology, and dynamic mechanical analysis of fibrillized blends

Alternative Approaches to Highly Oriented Polyesters and Polyamides with Improved Mechanical Properties

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Poly(ethylene terephthalate) fibres with improved mechanical properties

Cited by 4 publications

References 18 publications

Heat setting

Heat setting

Study of PET/PP/TiO2 microfibrillar‐structured composites, part 1: Preparation, morphology, and dynamic mechanical analysis of fibrillized blends

Alternative Approaches to Highly Oriented Polyesters and Polyamides with Improved Mechanical Properties

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Study of PET/PP/TiO₂ microfibrillar‐structured composites, part 1: Preparation, morphology, and dynamic mechanical analysis of fibrillized blends