γ射线辐照对PA6/PTFE合金吸水与力学性能的影响

PTFE

γ射线辐照对PA6/PTFE合金吸水与力学性能的影响
Effect of gamma irradiation on water absorption and  mechanical properties of PA6/PTFE blends

作　　者：肖华明[1,2] 吴国忠[2] 罗文波[1]

XIAO Hua-ming, WU Guo-zhong  , LUO Wen-bo  （1. College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan 411105, China; 2. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China）

机构地区：[1]湘潭大学土木工程与力学学院,湖南湘潭411105 [2]中国科学院上海应用物理研究所,上海201800

出　　处：《材料科学与工艺》 EI CAS CSCD 2008年第16卷第6期 759-762页,共4页

Materials Science and Technology

基　　金：国家自然科学基金资助项目（10772156）;教育部留学回国人员科研启动基金资助项目（教外司留[2007]1108）.

摘　　要：为了探讨辐照对尼龙6（PA6）基共混材料吸水性能和力学性能的影响,制备了PA6和聚四氟乙烯（PTFE）共混合金并在室温下进行不同剂量的60Coγ射线辐照.通过吸水率测试、准静态拉伸和弯曲实验以及缺口冲击测试,研究了辐照对PA6/PTFE共混体系吸水性能以及吸收水和辐照剂量对共混合金动静态力学性能的影响.结果表明,辐照过程引发交联反应,共混合金的拉伸强度、拉伸模量和弯曲模量均随辐照剂量的增大而增大,而缺口冲击强度和吸水率则随之减小.吸收水对共混合金缺口冲击强度的影响与合金组分有关.PTFE含量较低时,吸收水抑制PTFE对合金冲击强度的减弱作用;当PTFE的质量分数大于7%时,吸收水反而加剧PTFE对材料冲击强度的减弱效应.此外,PA6/PTFE合金的吸水率随PTFE含量的增加而降低,而弯曲模量则先增后减.

In order to investigate the influence of radiation on water absorption and mechanical properties of blends with PA6 matrix, PA6/PTFE blends with varying VFFE contents from 3 wt% to 15 wt% were prepared and irradiated by ^60Co γ-ray at ambient conditions up to 100 kGy. Water absorptivity measurement, quasi-static tension and bending tests, and U-notched Charpy impact tests were conducted to evaluat the irradiation-induced changes in water absorption and mechanical properties of the blends. It is shown that the exposure to ^60Co γ-ray radiation improves the tensile modulus, tensild strength and flexural modulus of the blends due to partial cross-linking, while the Charpy impact strength and water absorptivity decrease with the irradiation dose. The effect of absorbed water on the impact behavior of PA6/PTFE blends depends on the PTFE content, the absorbed water restrains the impact strength reduction of the blends with lower PTFE content, while it plays a reverse role when the PTFE content exceeds about 7%. Moreover, the water absorptivity of PA6/PTFE blends decreases with the increasing PTFE content, while the flexural modulus initially increases to a maximum value and then decreases with further increase of the PTFE content.

关 键 词：γ射线辐照 PA6/PTFE共混物 力学性能 吸水性能
gamma-ray irradiation PA6/PTFE blends mechanical property water absorption
分 类 号：O644.23 [数理科学和化学 > 化学 > 物理化学（理论化学）、化学物理学 > 光化学、辐射化学、超声波作用的化学过程 > 辐射化学]

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