Comparison between electron-beam and chemical crosslinking of silicone rubber
Comparison between electron-beam and chemical crosslinking of silicone rubber
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DOI：
10.1016/j.nimb.2005.09.013
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发表时间：
2006-02-01
影响因子：
1.3
通讯作者：
Panahinia, F
中科院分区：
文献类型：
--
作者：
Frounchi, M;Dadbin, S;Panahinia, F
在无化学试剂的情况下，用电子束在50-300 kGy的剂量范围内辐照硅橡胶（SR）。用溶剂溶胀法和弹性模量法测定了SB网络中交联点间的分子量。比较了电子束辐照交联和化学硫化交联弹性体的网络结构。进行机械测试以确定样品的海岸硬度、拉伸伸长率、强度和模量。结果发现，SR是有效的电子束辐照交联。辐照SR的拉伸强度、硬度、定伸应力和伸长率均高于过氧化物交联SR，纯橡胶的最佳辐照剂量为150 kGy，加入10 wt.%的过氧化物后，辐照SR的最佳辐照剂量降至50 kGy气相二氧化硅通过M-c测量验证了气相二氧化硅的协同效应，其显示在橡胶中存在气相二氧化硅时显著降低。通过比较Guth-Smallwood方程计算的模量值和实验数据，也验证了性能的协同作用。辐照SR样品中化学试剂的缺乏使其成为医学应用的适当选择。(c)2005 Elsevier B. V.保留所有权利。
Silicone rubber (SR) was irradiated by electron beam over a dose range of 50-300 kGy in the absence of chemical reagents. Molecular weight between crosslinks (M-c) in the network of SB was determined by two methods of solvent swelling and modulus of elasticity. The network structure of the elastomer crosslinked by electron beam irradiation and chemical vulcanization was compared. Mechanical tests were performed to determine shore hardness, tensile elongation, strength and modulus of the samples. It was found that SR is effectively crosslinked by electron beam irradiation. The tensile strength, hardness, modulus and elongation of irradiated SR were higher than peroxide-crosslinked SR. The optimum dose for the neat rubber was 150 kGy which reduced to 50 kGy with addition of 10 wt.% fumed silica. The synergistic effect of fumed silica was verified by M-c measurements which showed a dramatic decrease in presence of fumed silica in the rubber. The synergism in properties was also verified by comparing the modulus values calculated from the Guth-Smallwood equation and experimental data. Absence of chemical reagents in irradiated SR samples makes them a proper choice for medical applications. (c) 2005 Elsevier B.V. All rights reserved.