REPUBLIQUE ALGERIENNE DEMOCRATIQUE ET POPULAIRE

Abstract
The polyimide present a significant behaviour of water absorption compared to other
polymers because of their imide groups, which induce in certain applications of insulation a
non desirable effects. Indeed, the relative humidity can influence in a considerable way the
electric properties of these materials. During this work, our interest is concerned with the
study of the influence of the relative humidity on the evolution of the electric properties of
polyimide film charged initially with a potential V0. This study is made through the
measurement of the surface potential decay and the surface potential profile. During this
work, the polyimide films are charged by corona system under a controlled atmosphere. The
evolution of the surface potential decay with time showed that the electrostatic discharge in
low relative humidity (80%) is more influenced by the initial level of chargement. The fall of
surface potential increase significantly with the initial tension. Profiles obtained for different
periods show that the flow of the deposited charges and the temporal evolution of the surface
potential is controlled by the contribution of the phenomena related to the bulk of material.
However, in more humid environment, the evolutions of the surface potential showed that the
presence of the water vapour increases the electrostatic discharge in polyimide films and this
increase was accentuated for the high level of charging. The surface potential decay was faster
for films charged under high humidity (80%) than other films charged under low humidity
(30%).
Finally, our results were simulated with a mathematical model which shows that there is a
good agreement between the theoretical and experimental results. The use of this model
enabled us to determine the effect of RH on the variation of the various parameters
controlling the surface potential decay such as: the capture time, the free time, the mobility
and the rate of injection.
: ﺺﺨﻠﻣ
ﻲﻓ ﺔﻴﻔﻴﻇو تﺎﻋﻮﻤﺠﻣ ﻰﻠﻋ ﺎﻬﺋاﻮﺘﺣﻻ اﺪه و تاﺮﻴﻤﻴﻟﻮﺒﻟا ﻦﻣ ﺎهﺮﻴﻏ ﻦﻣ ﺮﺒآا ءﺎﻤﻟا صﺎﺼﺘﻣﻻ ﺔﻴﻠﺑﺎﻘﺑ تاﺪﻴﻤﻴﻟﻮﺒﻟا ﺰﻴﻤﺘﺗ
. داﻮﻤﻟا ﻩﺪﻬﻟ لﺰﻌﻟا ﺺﺋﺎﺼﺧ ﻰﻠﻋ ﺮﺛﺆﻳ ﺎﻤﻣ ﻲﺋﺎﻴﻤﻴﻜﻟا ﺎﻬﺒﻴآﺮﺗ ﻲﻓ ﺪﻴﻤﻳأ ﻦﻣ
ﻲﻓ ﻞﻤﻌﻟا اﺪه جرﺪﻨﻳ " ﺮﻴﻤﻴﻟﻮﺒﻟا"
ﺎﻬﻨﻣ ﺔﺻﺎﺧ لزاﻮﻌﻟا ﺮﺒﻋ ﻲﺋﺎﺑﺮﻬﻜﻟا ﻞﻘﻨﻟا تﺎﻴﻟﺁ لﻮﺣ ﺔﻔﻠﺘﺨﻤﻟا تﺎﺳارد لﻼﺧ ﻦﻣ
ﻊﺒﺘﺗ لﻼﺧ ﻦﻣ ﻚﻟاد و " ﺪﻴﻤﻴﻟﻮﺒﻟا"
ﻦﻣ ﺢﺋاﺮﺷ ﺮﺒﻋ ﻲﺋﺎﺑﺮﻬﻜﻟا ﻞﻘﻨﻟا تﺎﻴﻟﺁ ﻰﻠﻋ ﺔﺑﻮﻃﺮﻟا ﻞﻣﺎﻋ ﺮﻴﺛﺄﺗ ﺔﺳارد رﺎﻃأ
30%)
ﺔﺑﻮﻃﺮﻟا ﻦﻣ ﺔﻔﻠﺘﺨﻣ ﺐﺴﻧ ﺮﻴﺛﺄﺗ ﺖﺤﺗ ﺔﻋﻮﺿﻮﻣ " ﺎﻧورﻮآ"
ﻎﻳﺮﻔﺘﺑ ﺔﻧﻮﺤﺸﻣ ﺔﺤﻳﺮﺸﻟ نﻮﻤﻜﻟا تاﺮﻴﻐﺗ
ﺢﻄﺳ ﻰﻠﻋ ﻎﻳﺮﻔﺘﻟا ﺔﻘﻄﻨﻣ جرﺎﺧ و ﺰآﺮﻣ ﻲﻓ ﻲﻨﺤﺸﻟأ ﻊﻳزﻮﺘﻟا ﻰﻠﻋ ﺔﺑﻮﻃﺮﻟا ﺮﻴﺛﺄﺗ ﻞﻤﻌﻟا اﺪه ضﺮﻌﻳ ﺎﻤآ.(
80%
ﻰﻟإ
ﻢﺠﺣ ﺮﺒﻋ ﺖﻤﺗ ﺔﻴﻟﺎﻘﻨﻟا نأ لﺪﻳ ﺎﻤﻣ ﻎﻳﺮﻔﺘﻟا ﺔﻘﻄﻨﻣ ﻲﻓ ةﺰآﺮﻤﺘﻣ ﺔﻴﺋﺎﺑﺮﻬﻜﻟا تﺎﻨﺤﺸﻟا نأ ﺔﻈﺣﻼﻣ ﻢﺗ ﺖﻴﺣ ﺔﺤﻳﺮﺸﻟا
. ﺔﺤﻳﺮﺸﻟا
ﺞﺋﺎﺘﻨﻟا . ﻲﺤﻄﺴﻟا نﻮﻤﻜﻟا تاﺮﻴﻐﺗ
سﺎﻴﻗ ﻞﺟا ﻦﻣ تارﺎﺷﻹا ﻂﻘﺘﻠﻣ ﺖﺤﺗ ﺔﻋﺮﺴﺑ ﺪﻴﻤﻴﻟﻮﺒﻟا ﺢﺋاﺮﺷ ﻞﻘﻨﺗ ﻎﻳﺮﻔﺘﻟا ﺔﻴﻠﻤﻋ ﺪﻌﺑ
(30%,80%) ﺔﺑﻮﻃﺮﻟا ﺐﺴﻧ ﻲﻓ تاﺮﻴﻐﺗ و ﺔﻟﺪﺘﻌﻣ ةراﺮﺣ تﺎﺟرد طوﺮﺷ ﺖﺤﺗ ﺖﻤﺗ ﺎﻬﻴﻠﻋ ﻞﺼﺤﻤﻟا
ﻊﻣ ﺎﻬﻴﻠﻋ ﻞﺼﺤﻤﻟا ﺞﺋﺎﺘﻨﻟا ﺖﻨﻴﺑ ﺚﻴﺣ ﻲﺤﻄﺴﻟا نﻮﻤﻜﻟا تاﺮﻴﻐﺗ ﺔﺳارﺪﻟ جذﻮﻤﻧ ﻰﻠﻋ دﺎﻤﺘﻋﻻا و ﺔﺣﻮﺘﻔﻣ ةراد لﺎﻤﻌﺘﺳﺎﺑ
. ﺔﺑﻮﻃﺮﻟا ﺔﺒﺴﻧ ﺖﻌﻔﺗرا ﺎﻤﻠآ ﺺﻗﺎﻨﺘﻟا اﺪه ﺪﻳاﺰﺘﻳ
نﻮﻤﻜﻟا ﻲﻓ ﺺﻗﺎﻨﺘﻣ ﻰﻨﺤﻨﻣ دﻮﺟو ﺔﻴﺒﻳﺮﺠﺗ ىﺮﺧأ
نﻮﻤﻜﻟا تاﺮﻴﻐﺗ ﻰﻠﻋ ﺮﺷﺎﺒﻣ ﺮﻴﺛﺄﺗ ﺎﻬﻟ ﻲﺘﻟا ﺔﻴﺋﺎﻳﺰﻴﻔﻟا ﺮهاﻮﻈﻟا ﻒﻠﺘﺨﻣ تاﺮﻴﻐﺗ ضاﺮﻌﺘﺳﺎﺑ ﺎﻨﻤﻗ ﻞﻤﻌﻟا اﺪه لﻼﺧ ﻦﻣ
ﻩﺪه ﻰﻠﻋ ﺮﺷﺎﺒﻤﻟا ﺔﺑﻮﻃﺮﻟا ﺮﻴﺛﺄﺗ حﺮﺷ ﻊﻣ ﺔﺑﻮﻃﺮﻟا ﺐﺴﻧ ﻲﻓ ﺮﻴﻐﺗ ﺔﻟﻻﺪﺑ ﺮهاﻮﻈﻟا ﻩﺪه تاﺮﻴﻐﺗ ضﺮﻋ لﻼﺧ ﻦﻣ ﻲﺤﻄﺴﻟا
.
ﺮهاﻮﻈﻟا