核级聚烯烃绝缘材料老化状态分析  

Aging State Analysis of Nuclear Grade Polyolefin Insulation Materials

作　　者：李建喜 曹丹 马芝森 单永东 王长进 朱益国 LI Jian-xi;CAO Dan;MA Zhi-sen;SHAN Yong-dong;WANG Chang-jin;ZHU Yi-guo(CGN-DELTA(Taicang)Testing Technology CO.,LTD.,Suzhou 215400 Jiangsu,China;Life Evaluation and Management Technology of Nonmetal Materials Lab,CGN National R and D Center,Suzhou 215400Jiangsu,China)

机构地区：[1]中广核三角洲(太仓)检测技术有限公司,江苏苏州215400 [2]国家能源核电非金属材料老化寿命与管理技术实验室,江苏苏州215400

出　　处：《合成材料老化与应用》2020年第1期8-12,共5页Synthetic Materials Aging and Application

摘　　要：实验选取核用聚烯烃辐射交联绝缘材料,在180℃下对其进行不同时间的热老化,对机械性能、绝缘性能、微观形貌、红外光谱等进行测试分析。结果表明:随着老化时间的增加断裂伸长率呈明显下降趋势,断裂强度先上升后下降;硬度随着老化时间的增加呈上升趋势;老化初期(72 h前)白度值下降明显,72 h后趋于平缓;随着老化时间的增加,体积电阻率呈上升趋势,介电强度呈先增大后下降的趋势;老化初期(72 h前)绝缘材料的介质损耗角正切值明显增大,72 h后随着老化时间增加,增加速度减慢逐渐趋于平缓;红外光谱显示,在3700 cm-1和1740 cm-1波数的羟基和羰基吸收峰强度随着老化时间的增加而增大,2917 cm-1和2852 cm-1波数的吸收峰的峰宽随着老化时间的增加而逐渐增大;扫描电子显微镜(SEM)微观形貌显示,随老化时间增加,材料表面变得粗糙。In the present study,radiation crosslinking polyolefin insulation materials for nuclear application were employed for thermal aging analysis via evaluating the mechanical properties,insulation properties,micro-morphology and Fourier Transform Infrared Spectroscopy(FTIR)under 180℃at different time.The experimental results showed that the elongation at break decreased continuously,the breaking strength increasedfirstly then decreased and the hardness increased persistently.At the early stage of aging(before 72 h),the whiteness value decreased obviously and remained at certain state when the time was more than 72 h.With the increasing of aging time,the volume resistivity increased,and the dielectric strengthfirstly increased and then decreased.At the initial stage of aging(before 72 h),the tangential value of dielectric loss angle of the insulated material significantly increased and remained at a certain state after 72 h.The FTIR indicated that,with the increasing of aging time,the intensities of two peaks at 3700 cm-1 and 1740 cm-1 attributing to hydroxyl and carbonyl respectively were enhanced and the width values of two peaks at 2917 cm-1 and 2852 cm-1 were promoted gradually.Moreover,the scanning electron microscope(SEM)images showed that the roughness of the material surface increased with the increasing of aging time.

关 键 词：聚烯烃 热老化 机械性能 绝缘性能 

分 类 号：TM21[一般工业技术—材料科学与工程]