Investigation on the rheological behavior of PA6 film during biaxial stretching

Liu, Jiaxin; Liao, Guangkai; Xie, Zhenyan; Li, Bowen; Cui, Lingna; Liu, Yuejun

doi:10.1016/j.mtcomm.2023.107616

Cited by 3 publications

(1 citation statement)

References 24 publications

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“…The biaxial stretching process (stretching temperature, stretching ratio, stretching rate) will directly affect the microstructure and macroscopic properties of BOPA6 [10]. At present, the investigation on BOPA6 mainly focuses on polycrystalline phenomena and crystal structure [11,12], and the structural evolution and macro property changes of BOPA6 under different bidirectional tensile conditions are not systematic and in-depth, which limits the performance optimization of BOPA6 films to a certain extent.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Correlation between Biaxial Stretching Process and Macroscopic Properties of BOPA6 Film

Li,

Liao,

et al. 2024

Polymers

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Biaxially oriented polyamide 6 (BOPA6) films were prepared by extrusion casting and biaxial stretching with polyamide 6. The effects of different biaxially oriented on the macroscopic properties of BOPA6 were investigated by characterizing the rheological, crystallization, optical, barrier and mechanical properties. The results show that the increase of stretching temperature leads to the diffusion and regular stacking rate of BOPA6 chain segments towards crystal nuclei increases, the relative crystallinity increases, reaching 27.87% at 180 °C, and the mechanical strength and optical performance decrease. Heat-induced crystallization promotes the transformation of β-crystals to α-crystals in BOPA6, resulting in a more perfect crystalline structure and enhancing oxygen barrier properties. BOPA6 chains are oriented, and strain-induced crystallization (SIC) occurs during the biaxial stretching. Further increasing the stretch ratio, the relative crystallinity increased to 30.34%. The machine direction (MD) and transverse direction (TD) tensile strength of BOPA6 (B-33) are nearly two times higher than the unstretched film, reaching 134.33 MPa and 155.28 MPa, respectively. In addition, the permeation decreases to 57.61 cc·mil/(m2 day), and the oxygen barrier performance has improved by nearly 30% compared to the sample B-22. BOPA6 has a high storage modulus at a high stretching rate (300%/s). Rapid chain relaxation would promote the molecular chain disorientation, destroy the entangled network of the molecular chain, and lead to a decrease in tensile strength, reducing to about 110 MPa.

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Section: Introductionmentioning

confidence: 99%

Investigation on the Correlation between Biaxial Stretching Process and Macroscopic Properties of BOPA6 Film

Li,

Liao,

et al. 2024

Polymers

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Investigation on the creep mechanism of PA6 films based on quasi point defect theory

Li,

Liao,

Liu

et al. 2024

Sci Rep

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Investigation on the biaxial stretching deformation mechanism of PA6 film based on finite element method

Li,

Liu,

Liao

et al. 2024

E-Polymers

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This study employed the finite element method to investigate the biaxial stretching deformation mechanism of polyamide 6 (PA6) Film. First, the PA6 film was subjected to biaxial stretching experiments under various conditions. Then, a three-dimensional finite element model of PA6 film was established. The biaxial stretching experiments of PA6 films under various conditions were simulated by the established finite element model. The results show that the biaxial stretching of the films under various conditions exhibited a transition from elastic deformation to plastic deformation. Meanwhile, as the stretching ratio increases, the more uniform stress and strain distribution on the film surface can be found in the stress and strain contour diagrams. The stress and strain distributions were found to be largely consistent under various annealing temperatures. However, lower stretching rates resulted in higher internal stress intensity, making the films more resistant to biaxial stretching. The findings of this study provide a theoretical reference for a deeper understanding of the deformation mechanisms of PA6 films during the biaxial stretching process.

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Investigation on the rheological behavior of PA6 film during biaxial stretching

Cited by 3 publications

References 24 publications

Investigation on the Correlation between Biaxial Stretching Process and Macroscopic Properties of BOPA6 Film

Investigation on the Correlation between Biaxial Stretching Process and Macroscopic Properties of BOPA6 Film

Investigation on the creep mechanism of PA6 films based on quasi point defect theory

Investigation on the biaxial stretching deformation mechanism of PA6 film based on finite element method

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