Biphenyl

　　Main Applications

　　High-Temperature Heat Transfer Media:

　　Mixtures of biphenyl and diphenyl ether (such as Dowtherm A) possess high boiling points (257℃) and low vapor pressures, making them widely used in high-temperature heat transfer systems in the chemical and food processing industries.

　　Materials Science:

　　Liquid Crystal Materials: Biphenyl derivatives (such as 4-pentyl-4'-cyanobiphenyl) are core components of TFT-LCDs, utilizing their ordered molecular arrangement to achieve optoelectronic responses.

　　Anti-Corrosion Coatings: Biphenyl-type diamond-like carbon (BP-DLC) is formed through hydrogenation-induced phase transformation. With a hardness of 37 GPa and strong adhesion to metal substrates, it is used for corrosion protection in aerospace and marine equipment.

　　OLED Blue Light Materials: Polycyclic compounds containing biphenyl structures (such as patented compounds) emit low-energy blue light with wavelengths of 460-465 nm, reducing harm to the human eye and extending device lifespan.

　　Pharmaceuticals and Pesticides:

　　Pharmaceutical Intermediates: Used in the synthesis of antitumor drugs (such as Garciyndiphenyl A) and anti-ulcer drugs (such as biphenyl dimethyl dicarboxylate).

　　Pesticides: Bifenthrin is a highly efficient insecticide that works by interfering with the insect nervous system.

　　Environmental Protection:

　　Biodegradable Materials: Biphenyl-derived polyesters possess degradability and are used in eco-friendly packaging.

　　Pollutant Adsorption: Three-dimensional biphenyl porous materials can adsorb heavy metal ions and organic pollutants in water.