NANOSTRINGS OF GEL PREPARED BY CROSSLINKING OF POLYMERS WITH ION BEAMS

研究了256 MeV Ar、306 MeV Ne和204 MeV C离子辐照聚二甲基硅氧烷的GdR。用膜过滤器分离辐照的聚二甲基硅氧烷的不溶性残留物。不溶性残留物的重量与辐照离子的数量成正比。这一结果表明，凝胶化发生在离子径迹中的高局部剂量区域。在每个离子轨道中产生凝胶串。通过原子力显微镜也观察到在重离子轨道中产生的聚二甲基硅氧烷的凝胶串的形成。不溶性残留物的产率与聚二甲基硅氧烷的初始分子量成正比，并取决于离子束。凝胶串的半径估计使用低LET辐射的交联的G值和适当的剂量分布在离子轨道同意与实验结果。

Gelation of polydimethylsiloxane irradiated with 256 MeV Ar, 306 MeV Ne, and 204 MeV C ions was examined. The insoluble residue of the irradiated polydimethylsiloxane was separated with membrane filters. The weight of the insoluble residue was proportional to the number of irradiated ions. This result indicates that gelation occurs in the high local dose region in the ion tracks. A gel string is generated in each ion track. Formation of gel strings of polydimethylsiloxanes generated in heavy ion tracks was also observed by atomic force microscopy. The yield of the insoluble residue is proportional to initial molecular weight of polydimehylsiloxane and it depends on the ion beams. The radius of the gel strings estimated using the G-value of crosslinking for low-LET radiation and with appropriate dose distributions in the ion tracks agrees with the experimental results.