Comparison of nanostructure and nanomechanical properties of cast and air sides of polyimide films from different manufacturers

Liu, Shaoyang; Chambers, Taylor G.; Cutts, William D.

doi:10.1016/j.micron.2021.103059

Cited by 2 publications

(3 citation statements)

References 21 publications

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“…The deflection and amplitude sensitivities of the probes were calibrated by the contact method with a sapphire sample before analysis. In this study, the adhesion force was recorded . The adhesion force was used to probe rPET/rPP interfacial domains and study the effect of PMDA.…”

Section: Methodsmentioning

confidence: 99%

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Reactive Blending of Recycled Poly(ethylene terephthalate)/Recycled Polypropylene: Kinetics Modeling of Non-Isothermal Crystallization

et al. 2023

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Plastics were developed to change our world for the better. However, plastic pollution has become a serious global environmental crisis. Thermoplastic polyesters and polyolefins are among the most abundant plastic waste. This work presents an in-depth non-isothermal crystallization kinetics analysis of recycled post-consumer poly(ethylene terephthalate) (rPET) and recycled polypropylene (rPP) blends prepared through reactive compounding. The effect of pyromellitic dianhydride (PMDA) on crystallization kinetics and phase morphology of rPET/rPP blends was investigated by differential scanning calorimetry (DSC) and microscopy techniques. DSC results showed that increasing rPP content accelerated rPET crystallization while reducing crystallinity, which indicates the nucleation effect of the rPP phase in blends. Further, it was found that the incorporation of PMDA increased the degree of crystallinity during non-isothermal crystallization, even though the rate of crystallinity decreased slightly due to its restriction effects. The non-isothermal crystallization kinetics was analyzed based on the theoretical models developed by Jeziorny, Ozawa, Mo, and Tobin. The activation energy of the crystallization process derived from Kissinger, Takhor, and Augis−Bennett models was found to increase in rPET/rPP blends with increasing PMDA due to hindered dynamics of the system. Rheological measurements revealed that rPET melt viscosity is remarkably increased in the presence of PMDA and reactive blending with rPP relevant for processing. Moreover, nanomechanical mapping of the rPP phase dispersed in the rPET matrix demonstrated the broadening of the interfacial domains after reactive blending due to the branching effect of PMDA. Findings from this study are essential for the recycling/ upcycling thermoplastics through non-isothermal fabrication processes, such as extrusion and injection molding, to mitigate the lack of sorting options.

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Section: Methodsmentioning

confidence: 99%

“…In this study, the adhesion force was recorded. 50 The adhesion force was used to probe rPET/rPP interfacial domains and study the effect of PMDA.…”

Section: Methodsmentioning

confidence: 99%

Reactive Blending of Recycled Poly(ethylene terephthalate)/Recycled Polypropylene: Kinetics Modeling of Non-Isothermal Crystallization

et al. 2023

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“…PI fiber is a kind of highperformance reinforcement material because of its light weight, high strength, radiation resistance, excellent mechanical properties and dimensional stability, excellent chemical and thermal properties, and special dielectric properties. [1][2][3][4][5][6][7] Compared with other highperformance resin matrix composites, the polyimide/ polyamic acid (PI/PAA) unidirectional reinforced composites can be prepared to the same thickness as films, 8,9 while also having the high performance of PI fibers, so they have been widely used in aerospace, electronics, integrated circuit packaging, and other fields.…”

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confidence: 99%

Surface modification of polyimide fibers for high-performance composite by using oxygen plasma and silane coupling agent treatment

Cheng

Shao

Chen

et al. 2022

Textile Research Journal

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In this study, the oxygen plasma and silane coupling agent composite treatment was used to modify the polyimide fiber surface to improve the interfacial properties. The oxygen plasma treatment introduced active groups on the fiber surface, which facilitated the grafting of silane coupling agent to the fiber surface. The surface morphology and chemical composition of fibers were characterized by scanning electron microscope and X-ray photoelectron spectroscopy. The results showed that after plasma treatment, the etching spots on the fiber surface increased with the plasma treatment time, and the surface O atom content, O/C ratio and C–O(H) bond ratio reached the highest value at 27 min plasma treatment. After the composite treatment, the surface Si atomic content reached the highest value after 27 min plasma pretreatment. Moreover, polyimide/polyamic acid unidirectional reinforced composites were prepared. In polyimide/polyamic acid composites, the interfacial shear strength of polyimide fibers first increased and then decreased with plasma treatment time, both in oxygen plasma treatment and in composite treatment, and increased by up to 36.98% and 61.68% respectively compared. In addition, the transverse tensile strength of polyimide/polyamic acid composites increased by 103.73% after composite treatment compared with the pristine specimens.

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Comparison of nanostructure and nanomechanical properties of cast and air sides of polyimide films from different manufacturers

Cited by 2 publications

References 21 publications

Reactive Blending of Recycled Poly(ethylene terephthalate)/Recycled Polypropylene: Kinetics Modeling of Non-Isothermal Crystallization

Reactive Blending of Recycled Poly(ethylene terephthalate)/Recycled Polypropylene: Kinetics Modeling of Non-Isothermal Crystallization

Surface modification of polyimide fibers for high-performance composite by using oxygen plasma and silane coupling agent treatment

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