Temperature effects on radiation induced phenomena in polytetrafluoroetylene (PTFE)-change of G-value
Temperature effects on radiation induced phenomena in polytetrafluoroetylene (PTFE)-change of G-value
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DOI：
10.1016/s0969-806x(97)00103-5
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发表时间：
1997-12-01
影响因子：
2.9
通讯作者：
Tabata, Y
中科院分区：
文献类型：
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作者：
Oshima, A;Ikeda, S;Tabata, Y
在 77-653 K 的温度范围内研究了聚四氟乙烯 (PTFE) 辐射诱导现象和 G 值的温度依赖性。众所周知，主链断裂发生在非常低于 PTFE 熔化温度 (600 K) 的温度。我们在实验中发现，随着辐照温度的升高，断链的 G 值显着增加，直到 600 K。除此之外，我们还认识到，在 613 K 熔融状态下辐照会发生交联（Tabata，1992；Oshima 等，1995；Tabata 等，1996）。在熔融状态下，交联的G值被发现为0.35(交联数/100eV吸收)，作为下限，并且断链的表观G值显着降低。高于633 K，主要发生辐射诱导交联，但同时发生一定程度的热解聚或分解。 (C) 1997 爱思唯尔科学有限公司。
Temperature dependencies on the radiation induced phenomena and G-value of polytetrafluoroethylene (PTFE) have been studied in a temperature range 77-653 K. It is well known that main chain scission occurs very;effectively below the melting temperature of PTFE (600 K). We have found in our experiments that G-value of chain scission increases significantly with increasing irradiation temperature, until 600 K. In addition to that, we have realized that crosslinking occurs by irradiation in the molten state at 613 K (Tabata, 1992; Oshima et al., 1995; Tabata et al., 1996). In the molten state, G-value of crosslinking was found to be 0.35 (number of crosslinking/100 eV absorption), as a lower limit, and the apparent G-value of chain scission is drastically reduced. Above 633 K, radiation induced crosslinking mainly occurs, however parallel thermal depolymerization or decomposition takes place to some extent. (C) 1997 Elsevier Science Ltd.