title: Deterministic control over high-Z doping of polydicyclopentadiene-based aerogel coatings.
abstract: We report on simple and efficient routes to dope polydicyclopentadiene (PDCPD)-based aerogels and their coatings with high-Z tracer elements. Initially, direct halogenation of PDCPD wet gels and aerogels with elemental iodine or bromine was studied. Although several pathways were identified that allowed doping of PDCPD aerogels by direct addition of bromine or iodine to the unsaturated polymer backbone, they all provided limited control over the amount and uniformity of doping, especially at very low dopant concentrations. Deterministic control over the doping level in polymeric aerogels and aerogel coatings was then achieved by developing a copolymerization approach with iodine and tin containing comonomers. Our results highlight the versatility of the ring-opening metathesis polymerization (ROMP)-based copolymerization approach in terms of functionalization and doping of low density polymeric aerogels and their coatings.
authors.affiliation: Chemical Sciences Division, Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA. kim61@llnl.gov
authors.forename: Sung Ho
authors.initials: SH
authors.lastname: Kim
authors.forename: Swanee J
authors.initials: SJ
authors.lastname: Shin
authors.forename: Jeremy M
authors.initials: JM
authors.lastname: Lenhardt
authors.forename: Tom
authors.initials: T
authors.lastname: Braun
authors.forename: John D
authors.initials: JD
authors.lastname: Sain
authors.forename: Carlos A
authors.initials: CA
authors.lastname: Valdez
authors.forename: Roald N
authors.initials: RN
authors.lastname: Leif
authors.forename: Sergei O
authors.initials: SO
authors.lastname: Kucheyev
authors.forename: Kuang Jen J
authors.initials: KJ
authors.lastname: Wu
authors.forename: Juergen
authors.initials: J
authors.lastname: Biener
authors.forename: Joe H
authors.initials: JH
authors.lastname: Satcher
authors.forename: Alex V
authors.initials: AV
authors.lastname: Hamza
mesh_terms: D005782:Gels / Q000737:chemistry; D007192:Indenes / Q000737:chemistry*; D007454:Iodides / Q000737:chemistry; D058105:Polymerization; D011108:Polymers / Q000737:chemistry*; D014131:Trace Elements / Q000737:chemistry*
chemical_list: D005782:Gels; D007192:Indenes; D007454:Iodides; D011108:Polymers; D014131:Trace Elements; C004689:dicyclopentadiene