Relaxation behavior of biaxially stretched PLA film during the heat setting stage

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

doi:10.3389/fmats.2023.1241104

Cited by 3 publications

(1 citation statement)

References 33 publications

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“…Biaxially oriented technology has become one of the main production methods of high performance films [1][2][3]. In the actual industrial production, the preparation process of the stretched film involves the complex microstructure evolution and mechanical behavior inside the polymer, so there are some basic scientific problems that have not yet been fully understood [4,5]. If a new mathematical constitutive model can be established to describe the stress-strain relationship of stretched films, it will be helpful to further explore the relationship between material microstructure evolution and mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the tensile rheological behavior of pa6 film based on fractional order model

Li,

Liao,

Liu

et al. 2023

Mater. Res. Express

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This paper presents the research results on rheological behavior of Polyamide 6 (PA6) film during uniaxial stretching. The creep and relaxation tests of PA6 films were conducted on dynamic mechanical analysis (DMA) tester under uniaxial tensile conditions. And analyzed the PA6 film creep behavior under different stress and temperature, the stress relaxation behavior under different strain. With the increase of temperature or stress, the creep behavior of PA6 film was enhanced. With the increase of strain, the relaxation of PA6 film showed an enhanced tendency. Fractional-order Maxwell model, fractional-order Kelvin model and fractional-order linear body model were used to fit and analyze the experimental data under different conditions. The results showed that the fractional-order linear body model was better suited for describing the rheological behavior of PA6 film under uniaxial stretching. Then, the fractional-order linear body model was used to fit and analyze the creep and relaxation curves under different conditions, and the rheological properties of PA6 film were discussed according to the fitting results. The results indicated that the rheological elements in the internal microstructure of PA6 film were more easily activated under high stress state, and the macroscopic viscous characteristics were more obvious under high strain state. The above results will provide a theoretical basis to further explore the deformation mechanism of PA6 film during tensile tests.

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Section: Introductionmentioning

confidence: 99%

Investigation on the tensile rheological behavior of pa6 film based on fractional order model

Li,

Liao,

Liu

et al. 2023

Mater. Res. Express

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Scale-Up Preparation of Biobased Poly(ethylene furanoate) Biaxial Orientation Films with Enhanced Mechanical and Barrier Properties for Packaging

Wang,

Jia,

Meng

et al. 2024

ACS Sustainable Chem. Eng.

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Poly(ethylene furanoate) (PEF) films, recognized for their promising barrier and mechanical properties, offer a sustainable alternative to conventional petrochemical-based poly-(ethylene terephthalate) (PET). In this study, the effects of biaxial orientation parameters on the properties of biaxially oriented PEF (BOPEF) and PET/PEF/PET multilayer coextrusion films were comprehensively investigated to explore the potential of PEF for high-barrier packaging materials. Optimized conditions for BOPEF films were achieved at a stretch ratio of 3.5, a temperature of 105 °C, and a rate of 100%/s, which enhanced the tensile strength to 145 MPa, the modulus of elasticity to 4.1 GPa, and the elongation at break to 88%. Moreover, these films exhibited superior barrier properties with an oxygen permeability of 0.0083 barrer, a carbon dioxide permeability of 0.0031 barrer, and a water vapor permeability of 5.54 × 10 −15 g•cm/(cm 2 •s•Pa). Under the same conditions, the mechanical properties and barrier properties of PET/ PEF/PET films were further improved by adding 20% PEF to PET/PEF/PET films. The barrier properties of oxygen, carbon dioxide, and water vapor were improved by 32%, 50%, and 74%, respectively. The pilot-scale production validated the laboratory findings, demonstrating stability in film performance and consistent barrier properties, thus confirming the feasibility of industrialscale production for applications in packaging. The findings from this study not only underscore the potential of PEF as a highperformance material in packaging applications but also illustrate the critical importance of process optimization in achieving the desired material properties. These results build a solid foundation for the broader industrial application of PEF, enhancing its viability as a scalable and environmentally friendly alternative in the packaging industry.

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Enhanced Impact Resistance, Oxygen Barrier, and Thermal Dimensional Stability of Biaxially Processed Miscible Poly(Lactic Acid)/Poly(Butylene Succinate) Thin Films

Jariyasakoolroj,

Kumsang,

Phattarateera

et al. 2024

Polymers

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This study investigates the crystallization, microstructure, and performance of poly(lactic acid)/poly(butylene succinate) (PLA/PBS) thin films processed through blown film extrusion and biaxial orientation (BO) at various blend ratios. Succinic anhydride (SA) was used to enhance interfacial adhesion in PLA-rich blends, while blends near 50/50 formed co-continuous phases without SA. Biaxial stretching and annealing, adjusted according to the crystallization behavior of PLA and PBS, significantly influenced crystallinity, crystallite size, and molecular orientation. Biaxial stretching induced crystallization and ordered chain alignment, particularly at the cold crystallization temperature (Tcc), leading to a 70–80-fold increase in impact resistance compared to blown films. Annealing further enhanced crystallinity, especially at the Tcc of PLA, resulting in larger crystallite sizes. BO films demonstrated reduced thermal shrinkage due to improved PLA crystalline structure, whereas PLA-rich blown films showed higher shrinkage due to PLA’s lower thermal resistance. The SA-miscibilized phase reduced oxygen transmission in blown films, while BO films exhibited higher permeability due to anisotropic crystal orientation. However, the annealing of BO films, especially at high temperature (Tcc of PLA), further lowered oxygen permeability by promoting the crystallization of both PLA and PBS phases. Overall, the combination of SA compatibilization, biaxial stretching, and annealing resulted in substantial improvements in mechanical strength, dimensional stability, and oxygen barrier properties, highlighting the potential of these films for packaging applications.

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Relaxation behavior of biaxially stretched PLA film during the heat setting stage

Cited by 3 publications

References 33 publications

Investigation on the tensile rheological behavior of pa6 film based on fractional order model

Investigation on the tensile rheological behavior of pa6 film based on fractional order model

Scale-Up Preparation of Biobased Poly(ethylene furanoate) Biaxial Orientation Films with Enhanced Mechanical and Barrier Properties for Packaging

Enhanced Impact Resistance, Oxygen Barrier, and Thermal Dimensional Stability of Biaxially Processed Miscible Poly(Lactic Acid)/Poly(Butylene Succinate) Thin Films

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