Inhomogeneous distribution of crosslinks in ion tracks in polystyrene and polysilanes

Journal Article · Fri Oct 01 00:00:00 EDT 2004 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.70.144203· OSTI ID:20664913

Seki, Shu; Tsukuda, Satoshi; Maeda, Kensaku; Matsui, Yoshinori; Saeki, Akinori; Tagawa, Seiichi ^[1]

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1. Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047 (Japan)

Gelation in polystyrene, poly(methylphenylsilane), and poly(di-n-hexylsilane) induced by irradiation with 30-200 keV Ga, Si, and Au ion beams is examined and compared with that induced by MeV-order ion beams of similar linear energy transfer. The apparent G values of crosslinking (crosslinks per 100 eV absorbed dose) are calculated using the Charlesby-Pinner relationship, and shown to be dramatically lower than for the corresponding MeV ion beams. This decrease is attributed due to the reduced ion track radius and an increase in the density of crosslinking points. The apparent crosslinking G value obtained by the Charlesby-Pinner relationship represents only the crosslinking points contributing to gelation, and other points such as intramolecular crosslinking in the core of the ion track are not counted in the relationship. The total volume of ion tracks is considered to be the most important feature determining the gel fraction produced by the ion beams. A new formulation that provides a good explanation of the gelation of the polymer is proposed, with applicability to ion beams with energy of keV to MeV order.

• OSTI ID: 20664913
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 70, Issue 14; Other Information: DOI: 10.1103/PhysRevB.70.144203; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CROSS-LINKING
EV RANGE
GELS
GOLD IONS
ION BEAMS
ION IMPLANTATION
IRRADIATION
KEV RANGE 10-100
KEV RANGE 100-1000
MEV RANGE
POLYMERS
POLYSTYRENE
RADIATION DOSES
SILANES