TY - JOUR
T1 - Inhomogeneous distribution of crosslinks in ion tracks in polystyrene and polysilanes
AU - Seki, Shu
AU - Tsukuda, Satoshi
AU - Maeda, Kensaku
AU - Matsui, Yoshinori
AU - Saeki, Akinori
AU - Tagawa, Seiichi
N1 - Funding Information:
The authors thank Professor H. Shibata, Graduate School of Engineering, Kyoto University and Dr. Y. Kunimi of the ISIR, Osaka University for valuable discussion. This work was supported in part by a Grant-in-Aid for scientific research from the Japan Society for the Promotion of Science.
PY - 2004/10
Y1 - 2004/10
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.70.144203
DO - 10.1103/PhysRevB.70.144203
M3 - Article
AN - SCOPUS:42749104696
VL - 70
SP - 144203-1-144203-8
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 0163-1829
IS - 14
M1 - 144203
ER -