ENVIRONMENTAL DEGRADATION OF THE ELECTRICAL AND THERMAL-PROPERTIES OF ORGANIC INSULATING MATERIALS

被引：44

作者：

APICELLA, A ^{[1
]}

EGIZIANO, L ^{[1
]}

NICOLAIS, L ^{[1
]}

TUCCI, V ^{[1
]}

机构：

[1] UNIV NAPLES,ELECT DEPT ENERGY,I-80125 NAPLES,ITALY

来源：

JOURNAL OF MATERIALS SCIENCE | 1988年 / 23卷 / 02期

关键词：

ELECTRIC CONDUCTIVITY - THERMOSETS - Electric Properties;

D O I：

10.1007/BF01174713

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The sorption behaviour of water molecules in epoxy-based thermosetting networks is related to modifications of the polymer properties. The hypothesized sorption modes and the corresponding mechanisms of plasticization are discussed on the basis of experimental liquid sorption tests, differential scanning calorimetry (DSC), and electrical analyses. Two modes of moisture sorption are assumed: a sorption leading to an increase in the free volume of the system and adsorption of the water molecules due to hydrogen bonding to hydrophilic groups present in the network and to the surfaces of holes which make up the excess free volume of the glassy polymer. Electrical investigation improved understanding of the hygrothermal ageing phenomena. Water conditioning of the composites modified the surface and bulk resistivities as a consequence of microstructural damage and plasticization.

引用

页码：729 / 735

页数：7

共 47 条

[31] SWELLING AND GLASS-TRANSITION RELATIONS FOR EPOXY MATRIX MATERIAL IN HUMID ENVIRONMENTS [J].