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What are the properties of chlorotrifluoroethylene
The basic properties of chlorotrifluoroethylene depend not only on its molecular structure, but also on its molecular weight and crystallinity.
The room temperature mechanical properties of chlorotrifluoroethylene are better than those of PTFE, with higher compressive strength, lower cold flow, higher compressive resilience and good elastic resilience. However, as chlorotrifluoroethylene is a crystalline polymer, its mechanical properties are strongly influenced by temperature and vary somewhat depending on crystallinity and molecular weight. During moulding, clear products with low crystallinity can be formed by sudden cooling and translucent products with high crystallinity by slow cooling. In general, as the crystallisation process proceeds, the tensile strength and hardness increase, but the elongation decreases.
The melting temperature (TM) of chlorotrifluoroethylene (PCTFE) is 211-216°C and the glass transition temperature (TG) is 71-99°C. PCTFE maintains good thermal stability at 250°C. However, crystallisation starts at 130°C and occurs at a rate of crystallisation in the temperature range of 160-200°C. As the degree of crystallisation increases.
3、Low temperature resistance
Under certain conditions, it can be used near zero degrees (-273°C).
4、Resistance to corrosion
The high fluorine content makes chlorotrifluoroethylene resistant to almost all chemicals and oxidisers. It can be impregnated for long periods in acids, alkalis or oxidisers without any change. At high temperatures it can only be corroded by molten alkali metals, fluorine and chlorine trifluoride. It swells when in contact with benzene and its congeners and polyhalides at high temperatures.
Of all plastics, PCTFE is water vapour permeable and is a good barrier polymer.
In terms of electrical properties, PCTFE has a small dielectric constant and dielectric loss factor over a wide range of frequencies, with excellent electrical properties such as insulation resistance and dielectric breakdown voltage, and is virtually unaffected by temperature and humidity. It is a high frequency insulating material that can withstand harsher conditions than conventional materials.
Chlorotrifluoroethylene has excellent optical properties. 3mm thick PCTFE sheet has optical transparency, film thickness of 2μM, film thickness of 1 to 4mμM, M muscle infrared light is 95%, its UV absorption is also very low.
PCTFE also has good weather resistance. Exposure to outdoor sunlight after a year has no effect on performance.
Process characteristics of chlorotrifluoroethylene:
(1) In the high shear stress range, the fluidity of high molecular weight PCTFE is close to that of a non-Newtonian fluid, while the fluidity of low molecular weight PCTFE tends to be that of a Newtonian fluid.
(2) The thermal conductivity is small and heat transfer is poor, so the temperature rise rate should be controlled during the forming process.
(3) PCTFE will decompose into toxic gases when heated above 300°C, so the moulding temperature should be strictly controlled.>
In addition, the equipment is seriously corroded during the forming process, the forming materials, nozzles and moulds should be made of special steel that is resistant to corrosion.
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