Structure and properties of nylon-6/amino acid modified nanoclay composite fibers

Hasani, Zahra; Youssefi, Mostafa; Borhani, Sedigheh; Mallakpour, Shadpour

doi:10.1080/00405000.2019.1570628

Cited by 7 publications

(7 citation statements)

References 23 publications

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“…However, nanocomposites processed at high both shear stress and screw speed (Figure 6D) presented a mixture of polymer crystals with α and γ form. Clay nanoparticles usually favor the formation of crystalline structures of Nylon 6 containing both α and γ form 32–35 …”

Section: Resultsmentioning

confidence: 99%

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Nylon 6/palygorskite nanocomposites: The influence of clay surface modification and processing parameters on the clay dispersion, mechanical, thermal, and rheological properties

Uribe‐Calderon,

Cisneros‐Rosado,

May‐Pat

et al. 2023

Polymer Composites

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The influence of surface modification and some processing parameters on the palygorskite (Pal) dispersion and the mechanical, thermal and rheological properties of the resulting Nylon 6 nanocomposites was investigated. Natural Pal was surface modified with hexadecyl tributyl phosphonium and 3‐aminopropyl trimethoxysilane to produce organoclays with different surface energy values. Nylon 6/Pal nanocomposites were produced by twin screw extrusion and then injection molded, Pal loading was 2 wt. % in all the cases. A screw configuration was designed to impose different level of shear stresses to the nanocomposites during processing, and nanocomposites were extruded at two different screw speeds. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observations indicated that Pal was dispersed differently depending mainly on the degree of shear stress and surface modification of Pal. The best tensile mechanical properties were achieved with Pal exhibiting the lowest surface energy value dispersed with the screw having high shear configuration. The fatigue life of nylon 6 improved with addition of Pal. The experimental results give some guidelines for producing Nylon 6/Pal nanocomposites with improved properties.

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Section: Resultsmentioning

confidence: 99%

“…Clay nanoparticles usually favor the formation of crystalline structures of Nylon 6 containing both α and γ form. [32][33][34][35] Table 2 summarized the melting temperatures and crystallization degrees of nanocomposites. The crystallinity degree was calculated as…”

Section: Thermal Propertiesmentioning

confidence: 99%

Nylon 6/palygorskite nanocomposites: The influence of clay surface modification and processing parameters on the clay dispersion, mechanical, thermal, and rheological properties

Uribe‐Calderon,

Cisneros‐Rosado,

May‐Pat

et al. 2023

Polymer Composites

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“…However, such composite fiber requires further study to achieve improved tensile strength that was not achievable in the aforesaid referred study (30).…”

Section: Variety Of Clay In Nch Studymentioning

confidence: 92%

Effects of Clay in Nylon Fibe

Uddin

2022

J. Phys.: Conf. Ser.

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Since the introduction of nylon 6:6, and nylon 6, the nylon fiber was in significant demand in home textile and technical textile articles. Its uses in hosiery, sail cloth, parachute, blouses, gowns and veils, swim suit, parachute, and lingerie etc. Improving the performance of any nylon matrix with the loading of clay content, for the desired effects, can be an important subject to expand the utilization of nylon in automotive, technical textiles etc. This review study is to find out how clay may contribute in the performance of nylon fiber, and what research directions are appealing in achieving the desired effects in nylon fibers. The known effects on orientation and crystal structure of any nylon polymer; and how the advantageous effects in the utilization of nylon are achievable through the incorporation of clay mineral particularly in composite fiber. Strength, fatigue and thermal stability are some improved effects possible. Heat resistance and flame retardancy are particularly discussed. The aim of this review study is to realize how the nylon fiber was modified using the montmorillonite clay; and to explore what are the possible effects, and improvement achieved.

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“…Indeed, the preparation of high-strength and high-modulus properties of the nylon 6 fibers is essentially dependent on the fibers’ crystalline structures and their developments, namely due to the developments of the γ phases into α phases’ structures. In general, the γ phase forms by three methods: the chemical treatments (iodine complexation treatment of the spun-yet fibers, − metal halide, montmorillonite clay (MMT) treatments, , and rare-earth halide , complexation), the physicomechanical treatments (the high-speed melt spinning − that arises from the orientation-induced crystallization process , ), and the physical treatments (the low crystallization temperatures or high cooling rate from the melt state). The nylon 6 will undergo γ-to-α crystal-phase transitions upon the drawing of the low-speed-spinning as-spun fibers, the annealing of the high-speed-spinning & the chemical-complexed fibers and the physical treatments (mainly crystallization at high temperatures or a low cooling rate from the melt state).…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, Yu et al have obtained symmetrical twin crystals along the hydrogen bond directions of the nylon 6 nanorods that have provided only an α phase structure. Some researchers considered the preparation of nanocomposites based on nylon 6 and nanomaterials, such as carbon nanotubes (CNTs), nanoclay (MMT), and graphene . Recently, superheated water has also been considered for polyamide dissolution, − nanocomposite, and revisable shielding processes …”

Section: Introductionmentioning

confidence: 99%

Tentative Confinement of Ionic Liquids in Nylon 6 Fibers: A Bridge between Structural Developments and High-Performance Properties

Dawelbeit

2021

ACS Omega

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A reversible confinement of ionic liquid (IL) among the amide segments has been carried out for the preparation of high-modulus and highstrength aliphatic semicrystalline nylon 6 fibers. In this research work, the suppression or the weakening of the hydrogen bonds during the conventional low-speed melt spinning process is followed by a hot-drawing stage and a subsequent IL extraction of the IL out of the 2% wt IL-confined fibers and an immediate thermal stabilization process for the improvement of the properties of the pristine nylon 6 fibers. The resulted crystal structural developments of the IL-confined fibers are attributed to ultimate molecular orientations, which have contributed to the developments of the overall fiber properties. Here, the influences of the IL on the γ and the α crystal phases, the γ-α transition, the morphological properties, and the tensile properties are investigated. The FTIR reported, experimentally, additional peaks at 1237 cm −1 for the γ crystal phase and at 1417 and 1476 cm −1 for the α crystal phase, in conformity with the theoretical computations. The XRD demonstrated that the conventional low-speed melt spinning can successfully be used to prepare as-spun IL-confined fibers having highly improved properties. The so prepared asspun IL-confined fibers are found to have a γ phase structure that has a small crystal size and high crystal perfections. Fortunately, the γ-to-α crystal phase transition for the IL-confined nylon 6 fibers can be acquired during the hot-drawing stage (stress-induced phase transformation). Furthermore, the IL extraction process followed by a thermal stabilization process, interestingly, has led to significant increases in both of the tensile strengths and the tensile moduli of the reverted nylon 6 fibers. The values that are found are 8.46 cN/dtex for the tensile strength and 39.09 cN/dtex for the tensile modulus. The structure−property relationships between the IL-confined and the reverted nylon 6 fibers have also been discussed.

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Structure and properties of nylon-6/amino acid modified nanoclay composite fibers

Cited by 7 publications

References 23 publications

Nylon 6/palygorskite nanocomposites: The influence of clay surface modification and processing parameters on the clay dispersion, mechanical, thermal, and rheological properties

Nylon 6/palygorskite nanocomposites: The influence of clay surface modification and processing parameters on the clay dispersion, mechanical, thermal, and rheological properties

Effects of Clay in Nylon Fibe

Tentative Confinement of Ionic Liquids in Nylon 6 Fibers: A Bridge between Structural Developments and High-Performance Properties

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