Premium
Ge‐ and sn‐containing poly( p ‐xylylene): synthesis, structure and thermal behavior
Author(s) -
Gerasimov Genrikh N.,
Popova Elena L.,
Nikolaeva Elena V.,
Chvalun Sergei N.,
Grigoriev Evgenii I.,
Trakhtenberg Leonid I.,
Rozenberg Valeria I.,
Hopf Henning
Publication year - 1998
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(19981001)199:10<2179::aid-macp2179>3.0.co;2-i
Subject(s) - copolymer , polymer chemistry , xylylene , monomer , materials science , polymerization , polymer , paracrystalline , chemistry , crystallography , composite material
Block copolymers of unsubstituted poly( p ‐xylylene)(PPX) and Ge‐ or Sn‐organic bridged PPX (GePPX and SnPPX) were prepared by pyrolysis of specially synthesized organometallic p ‐cyclophane precursors followed by deposition and polymerization of the thus produced p ‐xylylene monomers. The copolymer structure and thermal behavior were investigated depending on deposition temperature (10 and −196°C). The copolymer PPX‐GePPX obtained from solid monomers deposited at −196°C ( 2a ) consists of long quasi‐independent PPX and GePPX blocks and has paracrystalline structure. Thermal treatment of 2a near 160°C yields crystalline regions of PPX along with paracrystalline aggregates of GePPX. Pyrolysis of this system near 300°C in an inert atmosphere results in the formation of Ge crystals in PPX matrix. In contrast, the copolymer PPX‐GePPX produced by simultaneous deposition and polymerization at 10°C ( 2a′ ) contains shorter blocks of PPX and GePPX than the copolymer deposited at −196°C. Copolymer 2a′ turns to the amorphous state during thermal treatment, and its pyrolysis does not lead to Ge‐crystal formation; hence the supramolecular structure of the polymer plays an important role in inorganic phase formation. The copolymer PPX‐SnPPX ( 2b ) is formed only at a deposition temperature of −196°C; deposition at 10°C yields oligomeric resins. The structure of 2b is nearly the same as that of 2a ; pyrolysis of 2b in air results in SnO 2 ‐crystal formation in a PPX matrix.