New trend of radiation application to polymer modification - irradiation in oxygen free atmosphere and at elevated temperature
New trend of radiation application to polymer modification - irradiation in oxygen free atmosphere and at elevated temperature
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DOI：
10.1016/s0969-806x(99)00406-5
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发表时间：
2000-03-01
影响因子：
2.9
通讯作者：
Seguchi, T
中科院分区：
文献类型：
--
作者：
Seguchi, T
聚碳硅烷(PCS)纤维作为碳化硅陶瓷纤维的前驱体，在无氧气氛下经电子束辐照固化。固化后的PCS纤维含氧量低，得到的低含氧量碳化硅纤维的耐热性高达1973K，拉伸强度可达3 GPa.将EB固化的氧含量极低的PCS纤维在氨气气氛中热解，可转化为氮化硅(Si3N4)纤维，是制备Si3N4纤维的新工艺。碳化硅纤维的合成工艺已发展到工业化生产，另一个应用领域是聚四氟乙烯(PTFE)的交联。聚四氟乙烯被认为是一种典型的断链聚合物，在无氧气氛中，熔融状态下的辐射可以诱导其发生交联。交联剂的结晶度、力学性能等物理性能发生了较大的变化，耐辐射性能也得到了很大的提高。(C)2000爱思唯尔科学有限公司。保留所有权利。
Polycarbosilane (PCS) fiber as a precursor for ceramic fiber of silicon carbide was cured by electron beam (EB) irradiation under oxygen free atmosphere. Oxygen content in the cured PCS fiber was scarce and the obtained silicon carbide (SIC) fiber with low oxygen content showed high heat resistance up to 1973 K and tensile strength of 3 GPa. Also, the EB cured PCS fiber with very low oxygen content could be converted to silicon nitride (Si3N4) fiber by the pyrolysis in NH, gas atmosphere, which was the new processing to produce Si3N4 fiber. The process of SIC fiber synthesis was developed to the commercial plant.The other application was the crosslinking of polytetrafluoroethylene (PTFE). PTFE, which had been recognized to be a typical chain scission polymer, could be induced to crosslinking by irradiation at the molten state in oxygen free atmosphere. The physical properties such as crystallinity, mechanical properties, etc, changed much by crosslinking, and the radiation resistance was much improved. (C) 2000 Elsevier Science Ltd. All rights reserved.