A glass fiber reinforced engineering plastic TPX developed by Mitsui Chemicals has many insulator applications in 5G and low conductivity: Because of its outstanding insulation characteristics, Dk value is 2.1 and Df is 0.0008 (12 GHz), so TPX is very Suitable for high-frequency applications, which means that in the future 5G high-frequency era, it has good application potential.
TPX is a polymer of 4-methylpentene-1 produced by Mitsui Chemicals Co., Ltd. of Japan, TPX is its trade name, chemical name is Methyl pentene copolymer, referred to as PMP.
TPX was first developed by British ICI in 1965, and commercial production began in 1968. Japan's Mitsui Petroleum Corporation (now Mitsui Chemicals Corporation) obtained ICI authorization, and began to produce TPX in 1973 and entered the market. Currently, Mitsui Chemicals, Inc. is the only TPX manufacturer in the world.
The high transparency of poly (4-methylpentene) is mainly due to the low optical anisotropy of the molecules in the helical group of the crystalline phase, and the close density and refractive index of the crystalline and amorphous parts. of. The refractive index of the crystalline part and the amorphous part are very close, which makes the material isotropy high. Therefore, TPX has become the only crystalline polymer in currently commercialized high transparency resins.
TPX materials mainly have the following properties:
1. Transparency: Although TPX is a crystalline resin, it has high transparency (haze degree <5%) and light transmittance> 93%.
2. Chemical resistance: Due to the stable C-C bond, TPX shows excellent chemical resistance, even better than polycarbonate or acrylic resin.
3. Heat resistance: The melting point of TPX is between 220 ℃ -240 ℃. It has a high Vicat softening point and can be used at high temperatures. However, its thermal deformation temperature is almost the same as polypropylene, so special attention must be paid to it. Applications of TPX? With external load.
4. Easy to peel: Because TPX has a very low surface tension, only 24mN / m, which is even lower than some fluororesins. Compared with other materials, TPX has excellent easy to peel.
5. Gas permeability: TPX has good gas permeability (10 times that of PE), which makes it a gas separation application, such as permeable membranes, membranes and porous fibers.
6. Low density: TPX is the lowest density in thermoplastic resin (833kg / m3).
7. Low conductivity: Because of its outstanding insulation characteristics, the dielectric constant ε = 2.1 (the dielectric constant of PTFE is 2.0 to 2.1) and tan δ = 0.0008 (at 12 GHz), so TPX is very suitable for applications in the high-frequency field This means that in the future 5G high-frequency era, it has good application potential.