During the accelerated thermal aging and ultraviolet radiation aging of pmma which is used as the core materials of fiber in pof , it was found that the relative permittivity of pmma decreased significantly to approximately equal to its square refractive index 摘要实验中观察到用作塑料光纤纤芯材料的纯有机玻璃（聚甲基丙烯酸甲酯）在加速热老化和紫外老化过程中其相对电容率急剧下降至大约等于其折射率的平方，即有机玻璃由极性聚合物变为非极性聚合物（ “全去偶极子极化”现象） 。
Common test methods for insulating and sheathing materials of electric cables . part 4 : methods specific to polyethylene and polypropylene compounds . section one : resistance to environmental stress cracking - wrapping test after thermal ageing in air - measurement of the melt flow index - carbon black and or mineral filler content measurement in pe 电缆绝缘和护套材料通用试验方法第4部分:聚乙烯和聚丙烯混合料专用试验方法第1节:耐环境应力开裂试验-空气热老化后的卷绕试验-熔体指数测量方法-聚乙烯中碳黑和或矿物质填料含量的测量方法
Insulating and sheathing materials of electric and optical cables - common test methods - methods specific to polyethylene and polypropylene compounds - tensile strength and elongation at break after conditioning at elevated temperature - wrapping test after conditioning at elevated temperature - wrapping test after thermal ageing in air - measurement of mass increase - long - term stability test - test method for copper - catalyzed oxidative degradation 电缆和光缆的绝缘和护套材料.通用试验方法.聚乙烯和聚丙烯化合物专用方法.高温处理后抗拉强度和断裂伸长度.高温处理后的卷绕试验.在空气中热老化后的卷绕试验.质量增加的测量.长期稳定性试验.催化铜氧化降解的试验方法
Common test methods for insulating and sheathing materials of electric cables . part 4 : methods specific to polyethylene and polypropylene compounds . section two : elongation at break after pre - conditioning - wrapping test after pre - conditioning - wrapping test after thermal ageing in air measurement of mass increase - long - term stability test appendix a . test method for copper catalysed oxidative degradation appendix b 电缆绝缘和护套材料通用试验方法第4部分:聚乙烯和聚丙烯混合料专用试验方法第2节:预处理后断裂伸长率试验-预处理后卷绕试验-空气热老化后的卷绕试验-测定质量的增加附录a :长期热稳定性试验附录b :铜催化氧化降解试验方法
Abstract : through contrast test ， characters of ig sealant filled by mineral oil were compared with those of the sealant unfilled by mineral oil ， such as durability ， heat aging resistance ， adhesive ability and the compatibility with hot melt butyl sealant ， and the ultraviolet irradiating resistance of the ig made by them 摘要：本文通过对比实验，比较了掺油和未掺油中空玻璃密封胶的耐久性、热老化性能、粘接性能以及与热熔丁基密封胶的相容性，比较了其制造的中空玻璃的耐紫外辐照性能。
Through contrast test , characters of ig sealant filled by mineral oil were compared with those of the mineral oil unfilled sealant , such as durability , heat aging resistance , adhesive ability and the compatibility with hot melt butyl sealant , and the ultraviolet irradiating resistance of the ig made by them 摘要通过对比实验，比较了掺油和未掺油中空玻璃密封胶的耐久性、热老化性能、粘接性能以及与热熔丁基密封胶的相容性，比较了其制造的中空玻璃的耐紫外辐照性能。
Common test methods for insulating and sheathing materials of electric cables - part 4 : methods specific to polyethylene and polypropylene compounds - section 1 : resistance to environmental stress cracking - wrapping test after thermal ageing in air - measurement of melt flow index - carbon black and or mineral filler content measurement in pe 电缆绝缘和铠装材料通用试验方法.第4部分:聚乙烯和聚丙烯复合物专用方法.第1节:耐环境应力裂化试验.空气中热老化后的缠绕试验.溶体流动指数的测量. pe中炭黑和或矿物填充料的含量测量
Insulating and sheathing materials of electric and optical cables - common test methods - part 4 - 1 : methods specific to polyethylene and polypropylene compounds - resistance to environmental stress cracking - measurement of the melt flow index - carbon black and or mineral filler content measurement in polyethylene by direct combustion - measurement of carbon black content by thermogravimetric analysis - assessment of carbon black dispersion in polyethylene using a microscope 电缆绝缘护套材料的通用试验方法.第4部分:聚乙烯和聚丙烯专用方法.第1节:耐环境应力破裂性.在空气中热老化后的卷绕试验.熔体流动指数测量.聚乙烯中炭黑和
Insulating and sheathing materials of electric and optical cables - common test methods - part 4 - 2 : methods specific to polyethylene and polypropylene compounds - tensile strength and elongation at break after conditioning at elevated temperature - wrapping test after conditioning at elevated temperature - wrapping test after thermal ageing in air - measurement of mass increase - long - term stability test - test method for copper - catalyzed oxidative degradation 电缆和光缆的绝缘和护套材料.通用试验方法.第4 - 2部分:聚乙烯和聚丙烯化合物专用方法.高温处理后抗拉强度和断裂伸长度.高温处理后的卷绕试验.在空气中热老化后的卷绕试验.质量增加的测量.长期稳定性试验.催化铜氧化降解的试验方法
A ; insulating and sheathing materials of electric and optical cables - common test methods - part 4 - 2 : methods specific to polyethylene and polypropylene compounds - tensile strength and elongation at break after conditioning at elevated temperature - wrapping test after conditioning at elevated temperature - wrapping test after thermal ageing in air - measurement of mass increase - long - term stability test - test method for copper - catalyzed oxidative degradation 电缆绝缘护套材料的通用试验方法.第4部分:聚乙烯与聚丙烯复合物专用方法.第2节:预处理后的断裂伸长率预处理后的翘曲试验在空气中热老化后的翘曲试验增加量测量长期稳定性试验
