The cyclic trimer, (NPCl 2 ) 3 , is commercially available and has formed the starting point for most commercial developments. Prominent among these developments has been the high performance elastomers known as PN-F or Eypel-F, which have been manufactured for seals, O-rings , and dental devices. An aryloxy-substituted polymer has also been developed as a fire resistant expanded foam for thermal and sound insulation . The patent literature contains many references to cyclomatrix polymers derived from cyclic trimeric phosphazenes incorporated into cross-linked resins for fire resistant circuit boards and related applications.
USA Home > Product Directory > Materials Science > Organic and Printed Electronics > Photonic and Optical Materials > Waveguide Materials > Polyphosphazenes
(b) ALS inhibitors: The acetolactate synthase (ALS) enzyme (also known as acetohydroxyacid synthase, or AHAS) is the first step in the synthesis of the branched-chain amino acids (valine, leucine, and isoleucine). These herbicides slowly starve affected plants of these amino acids which eventually lead to inhibition of DNA synthesis. They affect grasses and dicots alike. The ALS inhibitor family includes sulfonylureas (SUs), imidazolinones (IMIs), triazolopyrimidines (TPs), pyrimidinyl oxybenzoates (POBs), and sulfonylamino carbonyl triazolinones (SCTs). ALS is a biological pathway that exists only in plants and not in animals thus making the ALS-inhibitors among the safest herbicides.