One of the most important uses is to coat optical fibers. The production companies include stove top protector Du Pont (trade name TeflonAF) and Asahi (trade name Cytop).At present, more than 90% of fluoropolymers in China are polytetrafluoroethylene (PTFE), and other more advanced fluoropolymers are almost not produced. Because the TFE unit structure is regular, it is very conducive to polymer crystallization; at the same time, the Tg of the copolymer decreases with the increase of the TFE component.

Amorphous fluororesin is one of the latest varieties of fluoropolymers, which was successfully developed in the early 1990s. Compared with the development history and trends of foreign countries, in order to meet the high performance The demand for materials, the planned and focused development of new varieties of fluoropolymers is very necessary.

Amorphous fluororesin for optical fiber coating must meet two conditions: (1) Completely amorphous, to ensure that fluororesin does not produce light scattering; (2) Glass transition temperature Tgge;140℃, to ensure that fluororesin has stable mechanical properties , It has good bonding performance with optical fiber. Du Pont’s Teflon AF1600 has a Tg of 160°C, and Teflon AF2400 has a Tg of 240°C.

Amorphous fluororesin not only possesses the usual chemical inertness, temperature resistance, weather resistance and other excellent properties of fluororesin, but also has excellent optical properties such as optical transparency, UV resistance, and low refractive index. Amorphous fluorine-containing resin is a multi-polymer copolymerization of perfluoro-1,3-dioxolene (PD) monomers and monomers such as VDF, HFP, TFE, and CTFE.

At the end of the contemporary period, large-scale production and application began. It can be widely used as optical materials, Semiconductor processing industry materials, electronic materials, etc. The following is an overview of the preparation of new varieties of fluoropolymers recently developed abroad. The most commonly used monomer in PD is perfluoro-2,2-dimethyl-1,3-dioxolopentene (PDD), and the most common comonomer is tetrafluoroethylene (TFE). Teflon AF is made by the copolymerization of PDD and TFE, and a small amount of other monomers are added