Miscibility and crystallization of polytetrafluoro-ethylene/poly(tetrafluoroethylene-co-perfluoropropylvinyl ether) blends

Endo, Masahiro; Yamada, Katsuaki; Tadano, Kenji; Nishino, Yoshikazu; Yano, Shinichi

doi:10.1002/(sici)1521-3927(20000401)21:7<396::aid-marc396>3.0.co;2-o

Cited by 10 publications

(7 citation statements)

References 9 publications

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“…In the quenched blends (a), the melting peak shifts to lower temperatures, as PFA content increases and when PFA content is more than 50%, splits into two peaks. 6 The low and high temperature peaks mainly come from the PFA and PTFE crystallites, respectively, and between the two peaks, an exothermic peak due to recrystallization is observed, as in the FEP/PTFE blends (Figure 2a). In the slowly cooled blends (b), the melting endotherm is seen as a single peak, for all blend ratios, although a very small peak appears near 560 K. The melting peak becomes smaller and moves to lower temperatures, as PFA content increases.…”

Section: Resultsmentioning

confidence: 99%

“…for PTFE, FEP (10 mol % HFP), and PFA were all about 5.3 (cal cm À3 ) 0:5 , which suggests a good compatibility for FEP/PTFE and PFA/PTFE blends. The compatibility of the two components in these blends was confirmed experimentally by dynamic mechanical (DM) studies and that for both FEP/ PTFE 13 and PFA/PTFE 3,6 blends; the relaxation attributable to a cooperative segmental motion in the amorphous region above T g 24-26 is seen as a single peak over all blend ratios.…”

Section: Compatibility In the Amorpohous And Molten Statesmentioning

confidence: 99%

“…Since FEP and PTFE components are separately crystallized when HFP content is 2 mol %, it is quite natural that they are so when HFP content is 10 mol %. As for crystallization behavior in PFA/PTFE blends, some discrepancies are recognized in previous reports: [3][4][5][6][7] In PFA (i.e., PVE content is 2 mol %)/PTFE blends, the two components were cocrystallized, forming PTFE-type crystallites. Runt et al 3 reported that in PFA1-2 (i.e., PVE content is 1-2 mol %)/PTFE blends, the two components are separately crystallized, although suggesting a possibility of cocrystallizations under a very rapid crystallization condition.…”

Section: Crystallization Behaviormentioning

confidence: 99%

“…Miscibility and crystallization behavior has been investigated for several binary blends of PTFE with perfluorinated TFE copolymers. [3][4][5][6][7] Runt et al 3 studied miscibility and crystallization for binary blends of PTFE (Teflon 3170) with poly(tetrafluoroethylene-co-perfluoropropylvinyl ether) (trade name Teflon PFA335, but simply called PFA in this paper), using dynamic mechanical (DM) spectroscopy and differential scanning calorimetry (DSC), where the perfluoropropylvinyl ether (PVE) content of the PFA was 1-2 mol %. DM spectra as a function of temperature showed two peaks labeled and , which were related to reorientational motion of long segments above the glass transition temperature (T g ) and room temperature crystal-crystal transition, 8 respectively.…”

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confidence: 99%

“…The crystallization thus depends on the comonomer content. We reported the miscibility and crystallization of PFA/ PTFE blends, using DSC, DM and X-Ray diffractometry, 6 where PVE content in PFA is about 2 mol %. PTFE and PFA components mixed and cocrystallized in the amorphous region.…”

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confidence: 99%

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Crystallization in Binary Blends of Polytetrafluoroethylene with Perfluorinated Tetrafluoroethylene Copolymer

Endo

Ohnishi

Kutsumizu

et al. 2004

Polym J

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ABSTRACT:Miscibility and crystallization were studied for two binary blends of polytetrafluoroethylene (PTFE) with poly(tetrafluoroethylene-co-10 mol % hexafluoropropylene) (FEP) and poly(tetrafluoroethylene-co-2 mol % perfluoropropylvinyl ether) (PFA), using DSC and X-Ray diffractometry. In FEP/PTFE blends, FEP and PTFE components were separately crystallized to form their own crystallites, while in PFA/PTFE blends, PFA and PTFE components were cocrystallized to form PTFE-type crystallites incorporating tetrafluoroethylene segments of PFA and PTFE. The crystallization behavior in both blends is discussed in terms of chemical structure, molecular weight, crystallization rate, blending method (how the two components are blended) and comonomer concentration. [DOI 10.1295/polymj.36.716] KEY WORDS Polytetrafluoroethylene / Poly(tetrafluoroethylene-co-10 mol % hexafluoropropylene) / Poly(tetrafluoroethylene-co-2 mol % perfluoropropylvinyl ether) / Blends / Crystallization / Polytetrafluoroethylene (PTFE) is a polymer with good thermal stability up to 720 K, excellent chemical resistance to many solvents, low surface energy, and good electric insulation.1 However, PTFE used industrially is generally required to have high molecular weight (for example, Teflon 3170 has an average number molecular weight, M n , of about 3:6 Â 10 5 ) enough to avoid excess crystallization, but the high molecular weight results in the high melt viscosity, and hence special processing technology such as powder sintering and paste extrusion is required to reform PTFE powders, for example, into sheets. To overcome the above undesirable properties of PTFE, fluorinated copolymers of tetrafluoroethylene (TFE), such as poly-(tetrafluoroethylene-co-hexafluoropropylene) (FEP) and poly(tetrafluoroethylene-co-perfluoroalkylvinyl ether) (PFAVE), have been developed. These copolymers are semicrystalline polymers and their melt viscosities are in general lowered by the introduction of comonomer, compared with those of PTFE, allowing their molding by usual melting extrusion and injection molding technologies.Recently, scientific interest has been paid to miscibility and crystallization in binary polymer blends.2 In particular, it is important to clarify how and why miscibility and crystallization occur in semicrystalline polymer/semicrystalline polymer blends. Miscibility and crystallization behavior has been investigated for several binary blends of PTFE with perfluorinated TFE copolymers.3-7 Runt et al. 3 studied miscibility and crystallization for binary blends of PTFE (Teflon 3170) with poly(tetrafluoroethylene-co-perfluoropropylvinyl ether) (trade name Teflon PFA335, but simply called PFA in this paper), using dynamic mechanical (DM) spectroscopy and differential scanning calorimetry (DSC), where the perfluoropropylvinyl ether (PVE) content of the PFA was 1-2 mol %. DM spectra as a function of temperature showed two peaks labeled and , which were related to reorientational motion of long segments above the glass transition temperature (T g ) and r...

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Section: Resultsmentioning

confidence: 99%

Section: Compatibility In the Amorpohous And Molten Statesmentioning

confidence: 99%

Section: Crystallization Behaviormentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Crystallization in Binary Blends of Polytetrafluoroethylene with Perfluorinated Tetrafluoroethylene Copolymer

Endo

Ohnishi

Kutsumizu

et al. 2004

Polym J

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Thermal properties of low loss PTFE‐CeO₂ dielectric ceramic composites for microwave substrate applications

Anjana¹,

Uma²,

Philip³

et al. 2010

J of Applied Polymer Sci

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Polytetrafluroethylene (PTFE) composites filled with CeO 2 were prepared by powder processing technique. The PTFE is used as the matrix and the loading fraction of CeO 2 in the composite varied up to 0.6 volume fraction. The thermal conductivity and coefficient of thermal expansion were studied in relation to filler concentration. The thermal conductivity increased and coefficient of thermal expansion decreased with increase in CeO 2 content. For 0.6 volume fraction loading of the ceramic, the composite has a thermal conductivity of 3.1 W/m C and coefficient of thermal expansion 19.6 ppm/ C. Different theoretical approaches have been employed to predict the effective thermal conductivity and coefficient of thermal expansion of composite systems and the results were compared with the experimental data.

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Recycling Tetrafluoroethylene–Perfluoroalkyl Vinylether Copolymer (PFA) Using Extrusion Process

Romoaldo

Francisquetti

Simon

et al. 2022

Macro Materials & Eng

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Tetrafluoroethylene–perfluoroalkyl vinylether copolymer (PFA) has a broad application ranging from biomedical and aerospace to corroding environments in the chemical industry. Despite a low share in end‐of‐life products, PFA processing can produce up to 30% of waste. Thus, understanding how recycled fluorinated polymers affect product performance is crucial to ensure primary recycling, besides economic and environmental reasons. In this paper, the utilization feasibility of PFA waste materials is investigated, i.e., recycled PFA (PFAr) in closed‐loop recycling. The effect of PFAr loading (5–100 wt.%) on the thermal, mechanical, rheological, and color properties and chemical resistance are studied. Thermal properties and chemical resistance showed no significant changes in all ranges of PFAr content tested. The addition of higher loads of PFAr (≥50 wt.%) leads to a reduction in mechanical properties, particularly stress‐strength analysis and elongation at break. However, elastic modulus and hardness have improved concurrently with an increase in the degree of crystallinity. The decrease in complex viscosity and yellowing of the samples occurred probably induced by a polymer chain degradation. Despite that, the addition of up to 10 wt.% of PFAr proved to be an effective alternative to reusing PFA residues based on mechanical recycling.

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Miscibility and crystallization of polytetrafluoro-ethylene/poly(tetrafluoroethylene-co-perfluoropropylvinyl ether) blends

Cited by 10 publications

References 9 publications

Crystallization in Binary Blends of Polytetrafluoroethylene with Perfluorinated Tetrafluoroethylene Copolymer

Crystallization in Binary Blends of Polytetrafluoroethylene with Perfluorinated Tetrafluoroethylene Copolymer

Thermal properties of low loss PTFE‐CeO₂ dielectric ceramic composites for microwave substrate applications

Recycling Tetrafluoroethylene–Perfluoroalkyl Vinylether Copolymer (PFA) Using Extrusion Process

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Miscibility and crystallization of polytetrafluoro-ethylene/poly(tetrafluoroethylene-co-perfluoropropylvinyl ether) blends

Cited by 10 publications

References 9 publications

Crystallization in Binary Blends of Polytetrafluoroethylene with Perfluorinated Tetrafluoroethylene Copolymer

Crystallization in Binary Blends of Polytetrafluoroethylene with Perfluorinated Tetrafluoroethylene Copolymer

Thermal properties of low loss PTFE‐CeO2 dielectric ceramic composites for microwave substrate applications

Recycling Tetrafluoroethylene–Perfluoroalkyl Vinylether Copolymer (PFA) Using Extrusion Process

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Thermal properties of low loss PTFE‐CeO₂ dielectric ceramic composites for microwave substrate applications