Crystal structure evolution of nylon 6/GO graft nanocomposites during heat treatments and cold drawing

Tan, Hao; Park, Soo‐Young

doi:10.1016/j.polymer.2015.09.071

Cited by 8 publications

(8 citation statements)

References 34 publications

(38 reference statements)

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“…As PNS content increased, the γ crystal gradually disappeared, and the α crystal gradually increased (Table ), which was received by the ratio of the integral area of α crystal to the integral area of γ crystal by XRD (as shown in the Supporting Information of Figure S4 and Table S1 for the calculation process). The α crystal type possessed higher modulus and hardness, whereas γ crystal type was tougher . It is well established that crystallization can improve the heat resistance of a polymer; we therefore deduce that the ability of PNS to act as heterogeneous nucleating agent promoting the PA6 crystal is the main reason that PNS could be used to modify PA6 and promote its heat resistance.…”

Section: Resultsmentioning

confidence: 72%

“…Nylon 6 (PA6) is a type of semicrystalline polyamide material used extensively in electrical equipment and in the aerospace and automobile industries due to its high toughness and strength. However, PA6 has relatively low‐heat resistance [heat deflection temperature ( HDT ) = 65 °C], compared with other high‐performance engineering plastics, such as polycarbonate (PC, HDT = 115 °C), polyphenyl ether (PPE, HDT = 130 °C), and polyphenylene sulfide (PPS, HDT = 260 °C), which limits its use in high‐heat resistant applications such as automotive engines, fuel systems, and certain types of electrical equipment.…”

Section: Introductionmentioning

confidence: 99%

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P(N‐phenylmaleimide‐alt‐styrene) as a heat‐resistant agent in the application of nylon 6

Liu

Yan

et al. 2019

J of Applied Polymer Sci

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P(N-phenylmaleimide-alt-styrene) (PNS) was synthesized, and nylon 6 (PA6)/PNS blends were prepared by melt blending. The heat resistant and crystallographic properties of PA6/PNS blends with different contents were investigated and analyzed. The results showed that the heat deflection temperature (HDT), relative crystallinity (X n ), and dynamic viscosity (η) increased with increasing PNS. The results of differential scanning calorimetry proved that PNS had played a positive role in nucleating PA6. Scanning electron microscosopy showed that the PNS domains were between 0.2 and 4 μm in diameter. The experimental results indicated that the addition of PNS improved the rigidity of PA6/PNS blends, thereby improving the heat-resistant properties of these blends.

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Section: Resultsmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 99%

P(N‐phenylmaleimide‐alt‐styrene) as a heat‐resistant agent in the application of nylon 6

Liu

Yan

et al. 2019

J of Applied Polymer Sci

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“…For example, the α crystal is obtained from solution crystallization or slow cooling from the melt, while the γ crystal is obtained with I 2 /KI treatment. [ 9,10 ] Interconversion of these phases is also possible under annealing or drawing conditions. [ 11–13 ] In addition to these phases, mesomorphic crystal forms (β or δ phases) have been observed experimentally and predicted by MSXX force field.…”

Section: Figurementioning

confidence: 99%

The Role of α, γ, and Metastable Polymorphs on Electrospun Polyamide 6/Functionalized Graphene Oxide

Macossay

Avila-Vega

Sheikh

et al. 2020

Macromol. Rapid Commun.

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The present paper describes the addition of nitroxide‐functionalized graphene oxide (GOFT) into polyamide 6 (PA6) micro‐ and nanofibers, which are obtained through electrospinning. Scanning electron microscopy micrographs demonstrate the presence of fibers. Tensile testing presents an unexpected and non‐obvious behavior, in which the Young's modulus, tensile strength, and elongation simultaneously and remarkably increase compared to the pristine polymer nanofibers. GOFT induces the hydrogen bonding between the NH group from PA6 with the functional groups, thus promoting higher crystallinity of the polymer matrix. Nonetheless, deconvoluted curves by differential scanning calorimetry reveal the presence of two quasi‐steady polymorphs (β and δ phases) contributing to 46% of the total crystallinity. This evidence suggests that their presence and high ratios are responsible for the unexpected and simultaneous enhancement of tensile properties.

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“…19 However, slow cooling or isothermal crystallization mainly produces α-form crystals of polyamide. 20 The α-to-γ phase transition can be caused by treatment with KI/I 2 , 21 mixing with clay, 22,23 and heating. 24 The γ-to-α phase transition can be achieved by drawing, 25 annealing, 26 hydrothermal effect, 27 and cyclodextrin.…”

Section: Introductionmentioning

confidence: 99%

Molecular Weight Discrete Distribution-Induced Orientation of High-Strength Copolyamide Fibers: Effects of Component Proportion and Molecular Weight

Zhou¹,

Wang²,

Jia³

et al. 2021

Macromolecules

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The mechanical properties of polymer fibers are dependent on the molecular chemical structure and condensed state structure. Effective control over these two structural parameters allows us to study the relationship between fiber structures and properties and thereafter optimizes the material performance. In this work, the copolyamides (CoPAs) are prepared by selecting polyamide 6 (PA6) as the matrix and copolymerizing with the polyamide 66 (PA66) component, and the CoPA/HwPA6 (CoPA-Hw) composites with discrete molecular weight distribution are further fabricated by adding the high-molecular-weight PA6 (HwPA6) component in the CoPA. The CoPA fibers and CoPA-Hw fibers are prepared via melt spinning, and the crystal structures and mechanical properties of the fibers are studied. The mechanical properties cannot be effectively improved by adjusting the content of the PA66 component in the CoPA molecular chains or increasing the molecular weight of the CoPA. However, the addition of the HwPA6 component can effectively inhibit the slippage of molecular chains under stress and maintain the orientation of the molecular chains during annealing. Therefore, the mechanical properties of the CoPA-Hw fibers are significantly improved, and the stress at break can reach 6.86 cN/dtex. It is expected that the molecular chain orientation of polymer materials resulting from discrete molecular weight distribution can be used to improve the mechanical properties of other polymer materials.

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Crystal structure evolution of nylon 6/GO graft nanocomposites during heat treatments and cold drawing

Cited by 8 publications

References 34 publications

P(N‐phenylmaleimide‐alt‐styrene) as a heat‐resistant agent in the application of nylon 6

P(N‐phenylmaleimide‐alt‐styrene) as a heat‐resistant agent in the application of nylon 6

The Role of α, γ, and Metastable Polymorphs on Electrospun Polyamide 6/Functionalized Graphene Oxide

Molecular Weight Discrete Distribution-Induced Orientation of High-Strength Copolyamide Fibers: Effects of Component Proportion and Molecular Weight

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