Structure–property relationship of different types of polyester industrial yarns

Samui, Barun Kumar; Prakasan, Manikanda Priya; Ramesh, C.; Chakrabarty, Debabrata; Mukhopadhyay, R.

doi:10.1080/00405000.2012.693277

Cited by 25 publications

(28 citation statements)

References 29 publications

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“…High‐modulus low‐shrinkage polyester yarns and high‐tenacity (HT) polyester yarns have high amorphous orientation that is desirable for their technical applications such as in tires and conveyer belts. Low‐shrinkage (LS) and super‐low‐shrinkage (SLS) polyester yarns are suitable for stationary applications because their amorphous orientations are normally less than 0.8 . Using an offline test method to establish the relationship between the structure and tensile proprieties, Liu et al .…”

Section: Introductionmentioning

confidence: 99%

Creep deformation and its correspondence to the microstructure of different polyester industrial yarns at room temperature

Kang

Liu

et al. 2018

Polymer International

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The room temperature creep behaviors and related microstructural changes of a high‐tenacity (HT) poly(ethylene terephthalate) (PET) industrial yarn and a super‐low‐shrinkage (SLS) PET industrial yarn were investigated and compared by using wide‐angle X‐ray scattering (WAXS), small‐angle X‐ray scattering (SAXS), birefringence measurements and Fourier transform infrared spectroscopy (FTIR) in order to identify their respective underlying creep mechanisms. The crystal structure including crystalline orientation and crystallinity of fibers did not show obvious changes after the creep process, while the amorphous structures varied with creep stress. The HT yarn creep deformation was mainly elastic, and its creep recovery ratio was high. The amorphous orientation, amorphous layer thickness and degree of conformation change from gauche to trans conformers showed a slight increase. The mechanism of this slight change is that the coiled molecular chains are oriented under tensile loading and most of the extended chains are disoriented under offloading in the small amorphous region. By contrast, the SLS yarn underwent plastic creep deformation with a low recovery ratio. After the creep test, the amorphous orientation and lamellar thickness both increased but the crystallinity remained unchanged. The creep mechanism for the SLS yarn is that the molecular chains in the large amorphous domain are easily extended and oriented subjected to tensile loading, while conformation transition from gauche to trans conformers and the formation of irreversible mesophase take place. © 2018 Society of Chemical Industry

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Section: Introductionmentioning

confidence: 99%

Creep deformation and its correspondence to the microstructure of different polyester industrial yarns at room temperature

Kang

Liu

et al. 2018

Polymer International

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“…Poly(ethylene terephthalate) (PET) is a thermoplastic polymer with excellent properties and has attracted many researchers’ attention because of its large number of applications in the form of plastic, film, and fiber . A thorough understanding of the structures of PET is of great interest.…”

Section: Introductionmentioning

confidence: 99%

“…In the applications of PET, the form of fiber is of great demand and considerable commercial importance. Over the past decades of years, PET industrial yarns have been widely used in many fields such as reinforcement in passenger radial tires, seat belts, coated fabrics, geotextiles, ropes, and cordage, due to its high tenacity, high modulus, and low shrinkage . Numerous attempts have been made to explain the structure–property relationships of PET fibers .…”

Section: Introductionmentioning

confidence: 99%

“…Over the past decades of years, PET industrial yarns have been widely used in many fields such as reinforcement in passenger radial tires, seat belts, coated fabrics, geotextiles, ropes, and cordage, due to its high tenacity, high modulus, and low shrinkage . Numerous attempts have been made to explain the structure–property relationships of PET fibers . These attempts can be classified in four categories, i.e., characterization of the semicrystalline structure and morphology, the effect of process conditions on the structures and properties, the influence of heat setting on the morphology and properties and the in situ studies on the structure formation.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, there exist other structure models of PET like dual lamellar stack models (with primary and secondary stacks) . For PET fibers, two‐phase model consisting crystalline and amorphous phase was generally used to analyze the structures by many researchers . In this model, fibrils are the fundamental building blocks and are made of lamellar stacks along the fiber axis.…”

Section: Introductionmentioning

confidence: 99%

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Insights into process–structure–property relationships of poly(ethylene terephthalate) industrial yarns by synchrotron radiation WAXD and SAXS

Liu

Yin²,

Zhao³

et al. 2015

J of Applied Polymer Sci

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Synchrotron radiation wide angle X-ray diffraction (WAXD) and small angle X-ray scattering (SAXS) were performed to study the structures of four typical types of poly(ethylene terephthalate) (PET) industrial yarns. Three-dimensional structural models of the yarns and comprehensive insights into the process-structure-property relationships were gained. High spinning speed, low draw ratio, and high heat-setting temperatures lead to HMLS yarns with high crystallinity, high amorphous orientation, densely packed lamellar stacks, and a small tilting angle of crystalline lamellae. High draw ratio tends to result in PET industrial yarns with large long period and a large tilting angle of lamellae. Heat-setting process has a significant influence on the amorphous orientation and crystalline structures, such as crystallinity, crystallite size, as well as crystal grain number. Compared with other structure characteristics, amorphous orientation plays a more important role in determining the tenacity, initial modulus, part load elongation, ultimate elongation, as well as shrinkage of PET industrial yarns. The crystal grain number seems to have an effect on the initial modulus, while the long period influences the elongation of the yarns to some extent. In addition, the small tilting angle of crystalline lamellae may relate to the dimensional stability of PET yarns.

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Influence of temperature during overmolding on the tensile modulus of self‐reinforced poly(ethylene terephthalate) insert

Jerpdal

Schuette

Ståhlberg³

et al. 2019

J of Applied Polymer Sci

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Self-reinforced polymer composites are thermoplastic materials for design of recyclable lightweight components. The combination of sheet forming and subsequent overmolding from these materials allows an efficient manufacturing process with function integration. This article investigates how temperature exposure during an overmolding cycle influences the tensile modulus, shrinkage, and warpage for an insert made from self-reinforced poly(ethylene terephthalate) (PET) when it is overmolded with polycarbonate (PC)/PET material. The temperature gradient that is induced by overmolding is simulated, and the results are validated through experiments. The results show that the insert reaches a temperature above the glass-transition temperature for the matrix material in the main part of the insert, which leads to relaxation of residual stresses and thereby a reduction of the tensile modulus up to 18% for the insert after overmolding. Even though overmolding is an efficient process, it requires thorough knowledge of how temperature influences the material when applied to self-reinforced composite materials. The study shows very interesting results, which can lead to new areas of applications for self-reinforced PET.

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Structure–property relationship of different types of polyester industrial yarns

Cited by 25 publications

References 29 publications

Creep deformation and its correspondence to the microstructure of different polyester industrial yarns at room temperature

Creep deformation and its correspondence to the microstructure of different polyester industrial yarns at room temperature

Insights into process–structure–property relationships of poly(ethylene terephthalate) industrial yarns by synchrotron radiation WAXD and SAXS

Influence of temperature during overmolding on the tensile modulus of self‐reinforced poly(ethylene terephthalate) insert

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