Chapter 3: Structural Diversity in Fluorinated Polyphosphazenes: Exploring the Change from Crystalline Thermoplastics to High-performance Elastomers and Other New Materials

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Abstract

Fluorine-containing polyorganophosphazenes, (NPRF2)n, constitute one of the largest and best developed areas of inorganic-organic polymer chemistry. Linear high polymers in this class are fire resistant, hydrophobic, fiber-, film- and elastomer-forming materials that, in many cases, have property combinations that cannot be matched by conventional fluorocarbon or non-fluorinated polymers. Most macromolecules of this type are synthesized by using the alkali metal salts of fluoroalcohols or fluorophenols for chlorine-replacement reactions with poly(dichlorophosphazene). This approach allows the synthesis of polymers with only one type of fluorinated side-group, mixed-substituent polymers or block copolymers. Single-substituent polymers in this series generate either semicrystalline or amorphous materials, depending on the length and flexibility of the side-chains. Mixed-substituent polymers are usually amorphous materials that can be covalently crosslinked to generate elastomers. In addition, elastomers have been produced by the incorporation of small percentages of rigid bulky side-groups that favor side-chain interdigitation, a process that leads to physical crosslinking. Finally, fluorophosphazene elastomers are accessible by the incorporation of organosilicon side-groups and by the formation of polyphosphazene-polyorganosilicon block copolymers.

Original languageEnglish (US)
Title of host publicationFluorinated Polymers, Volume 1
Subtitle of host publicationSynthesis, Properties, Processing and Simulation
EditorsBruno Ameduri, Hideo Sawada, Ben Zhong Tang
PublisherRoyal Society of Chemistry
Pages54-79
Number of pages26
Edition24
DOIs
StatePublished - Jan 1 2017

Publication series

NameRSC Polymer Chemistry Series
Number24
Volume2017-January
ISSN (Print)2044-0790
ISSN (Electronic)2044-0804

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All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Bioengineering
  • Biomaterials
  • Polymers and Plastics

Cite this

Allcock, H. R. (2017). Chapter 3: Structural Diversity in Fluorinated Polyphosphazenes: Exploring the Change from Crystalline Thermoplastics to High-performance Elastomers and Other New Materials. In B. Ameduri, H. Sawada, & B. Z. Tang (Eds.), Fluorinated Polymers, Volume 1: Synthesis, Properties, Processing and Simulation (24 ed., pp. 54-79). (RSC Polymer Chemistry Series; Vol. 2017-January, No. 24). Royal Society of Chemistry. https://doi.org/10.1039/9781782629368-00054