title: Polymeric materials based on main group elements: the recent development of ambient temperature and controlled routes to polyphosphazenes.
abstract: This Perspective discusses the development of new routes to polyphosphazenes, [R(2)P[double bond, length as m-dash]N](n), that occur at ambient temperature and, in some cases, allow molecular weight control and access to narrow molecular weight distributions and block copolymers. For example, the room temperature silyl-carborane initiated ring-opening polymerisation of (NPCl(2))(3) is described together with chain growth condensation polymerisations of phosphoranimines Cl(3)P[double bond, length as m-dash]NSiMe(3) and BrMePhP[double bond, length as m-dash]NSiMe(3). Recent works on donor-stabilised cationic phosphoranimines are also discussed.
authors.affiliation: School of Chemistry, University of Bristol, Bristol, UKBS8 1TS.
authors.forename: Vivienne
authors.initials: V
authors.lastname: Blackstone
authors.forename: Alejandro
authors.initials: A
authors.lastname: Presa Soto
authors.forename: Ian
authors.initials: I
authors.lastname: Manners