Properties of MFA
- Perfluoroalkoxy resin (PFA) is a copolymer with a molar ratio of TFE and perfluoropropyl vinyl ether (PPVE) of approximately 100:1. Methyl fluoroalkoxy resin (MFA) is a copolymer of TFE and perfluoromethyl vinyl ether (PMVE), so it has similar characteristics to PFA with a slightly lower melting point. Table 1 lists the general properties of PFA and MFA for comparison.
Table 1. General properties comparison of PFA and MFA
|General Properties||MFA||PFA||ASTM Method|
|Specific gravity||2.12–2.17 g/cm3||2.12–2.17 g/cm3||D792|
|Melting temperature||280–290 °C||300–310 °C||D2116|
|Coefficient of linear thermal expansion||12–20 1/K 10-5||12–20 1/K 10-5||E831|
|Specific heat||1.1 kJ/kg K||1.0 kJ/kg K||—|
|Thermal conductivity||0.19 W/K.m||0.19 W/K.m||D696|
|Oxygen index||> 95%||> 95%||D2863|
|Hardness Shore D||55–60||55–60||D2240|
|Friction coefficient (on steel)||0.2||0.2||—|
|Water absorption||< 0.03%||< 0.03%||D570|
- MFA is a semi-crystalline polymer, and its crystallinity depends on the manufacturing conditions, especially the cooling rate. Generally, the light transmittance of fluorocarbon films depends on the crystallinity and crystal morphology of the polymer. The light transmittance includes parameters such as high transmittance in the ultraviolet, visible and infrared regions of the spectrum. For example, MFA film with 0.2 mm thickness has high transmittance in the UV region (wavelength 200 to 400 nm), and its refractive index is close to 1.3.
- MFA can be relatively easily processed into films and sheets without microporous by traditional thermoplastic methods, so they have obvious advantages over PTFE in certain applications, such as anti-corrosion and anti-stick coatings.
- It can be made into high-temperature electrical insulating materials and components and parts that require long bending life.
- In the chemical industry, it is used for processing equipment, linings, special pipes and molded products.
- It can be used for the lining of bellows and expansion joints, valves, pipes, pumps and fittings.
- In the research of colloid science, MFA can be used as the research object to explore various mechanisms, such as sedimentation balance and particle sedimentation dynamics. The colloid made of MFA particles can be characterized by traditional dynamic light scattering and traditional depolarized dynamic light scattering.
Figure 1. Timely visualization of the dialyzed MFA concentrated suspension and the initial supernatant distilled water 
- Roberto Piazza, Stefano Buzzaccaro and Eleonora Secchi, J. Phys.: Condens. Matter 24 (2012) 284109.
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