Influence of the Radiation Destruction of Polymeric Insulation on its Ageing in the Impulse Electric Field

2014 ◽  
Vol 880 ◽  
pp. 88-92 ◽  
Author(s):  
Peter N. Bychkov ◽  
Olga V. Solodovnikova
Keyword(s):  
Service Life ◽  
Radiation Resistance ◽  
Molecular Level ◽  
Gas Permeability ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Volume Charge ◽  
Charge Accumulation ◽  
Gaseous Products ◽  
Ionizing Radiations

Sensitivity of the destructive doses of ionizing radiations, specifically radiolysis gaseous products to multipulse electric intensity of low-density polyethylene (LDPE) and a polymethyl-methacrylate (PMMA) was investigated. LDPE and PMMA were found to differ significantly depending on radiation resistance and gas permeability. The service life of the materials was basically determined by the intensity of the destruction processes at the molecular level, the macrodefects were developed at the last ageing stage . It was shown that microseconds impulses did not cause accumulation of volume charge in LDPE and PMMA. It was concluded that the ageing of polymer dielectrics affected by electric microseconds impulses did not relate to volume charge accumulation in the polymers.

Effect of additives on morphology and space charge accumulation in low density polyethylene

2003 ◽  
Vol 10 (1) ◽  
pp. 148-154 ◽  
Author(s):  
Y. Tanaka ◽  
G. Chen ◽  
Y. Zhao ◽  
A.E. Davies ◽  
A.S. Vaughan ◽  
...  
Keyword(s):  
Space Charge ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Charge Accumulation ◽  
Effect Of Additives

scholarly journals Influence of Temperature on Charge Accumulation in Low-Density Polyethylene Based on Depolarization Current and Space Charge Decay

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 587 ◽  
Author(s):  
Guochang Li ◽  
Jiaxing Wang ◽  
Wang Han ◽  
Yanhui Wei ◽  
Shengtao Li
Keyword(s):  
Space Charge ◽  
Charge Trapping ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Insulation Material ◽  
Charge Accumulation ◽  
Depolarization Current ◽  
Close Link ◽  
Influence Of Temperature ◽  
Influence Of Temperature On

Temperature is one of the key factors affecting space charge accumulation in high voltage direct current (HVDC) cable insulation material. The influence of temperature on charge accumulation in low density polyethylene (LDPE) has been investigated with a combined thermally stimulated depolarization current (TSDC) method and pulsed electro-acoustic (PEA) method. The experimental results indicate that there exists a transition temperature region of charge accumulation around 50 °C. The total accumulated charges all firstly increase and then decrease with the increasing polarization temperature under three typical polarization electric fields, and they have more accumulated charges in LDPE around 50 °C. The phenomenon has a close link with the dynamic processes of charge trapping and de-trapping, which were verified by TSDC results. At room temperature, the trapped charges are difficult to release from the traps, and these homocharges near the cathode can depress the further injection of the charges. More charges can be injected from the electrodes with the increase of temperature, while the charge migration is relatively lower before 50 °C, leading to more accumulated charges. When the temperature exceeds around 50 °C, the molecular movement is accelerated which can enhance the hopping probability of charges between the adjacent traps, resulting in few accumulated charges.

Anisotropy evolution of low density polyethylene greenhouse covering films during their service life

2018 ◽  
Vol 66 ◽  
pp. 146-154 ◽  
Author(s):  
M.I. Babaghayou ◽  
Abdel-Hamid I. Mourad ◽  
Vicente Lorenzo ◽  
S.F. Chabira ◽  
M. Sebaa
Keyword(s):  
Service Life ◽  
Low Density Polyethylene ◽  
Low Density

Enhancement of Miscibility and Thermal Properties of Linear Low Density Polyethylene (LLDPE)/Polysulfone (PSU) Polymer Blends by Functionalization of LLDPE

2019 ◽  
Vol 796 ◽  
pp. 22-29
Author(s):  
N.A. Ahmad ◽  
Shaifulazuar Rozali ◽  
Mohd Faizul Mohd Sabri ◽  
C.Y. Chee ◽  
Suriani Ibrahim
Keyword(s):  
Glass Transition ◽  
Molecular Level ◽  
Weight Percent ◽  
Decomposition Temperature ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Casting Technique ◽  
Blended Polymer ◽  
Optimum Weight

Blended polymer composites are prepared based on linear low density polyethylene (LLDPE) and mixed with polysulfone (PSU) using solvent casting technique. LLDPE is functionalized with carbonyl functional groups to enable it to interact with PSU from the molecular level. Various weight percent of PSU is added into LLDPE to find the optimum weight percent ratio between LLDPE and PSU. The highest glass transition temperature obtained is 47.58°C for ratio LLDPE to PSU of 7:3. In addition, value for decomposition temperature is increased up to 490.16°C with the increasing of PSU content. SEM observation of the blended polymer films shows that glass transition and decomposition temperature depend on morphology of the blended polymers.

Hardness and Micro-Indentation Hardness Comparison of Recycled Modified HDPE

2014 ◽  
Vol 606 ◽  
pp. 217-220 ◽  
Author(s):  
Jan Navratil ◽  
Miroslav Manas ◽  
Michal Stanek ◽  
David Manas ◽  
Martin Ovsik ◽  
...  
Keyword(s):  
Surface Layer ◽  
Service Life ◽  
High Density Polyethylene ◽  
Indentation Test ◽  
Hardness Test ◽  
Measured Data ◽  
Low Density Polyethylene ◽  
Indentation Hardness ◽  
Low Density ◽  
Micro Indentation

This research paper deals with the possible utilization of irradiated high-density polyethylene (HDPE) after its service life. Powder of recycled irradiated HDPE is used as filler into virgin low-density polyethylene (LDPE) in concentrations from 10 to 60 %. Two combinations of materials were tested granules LDPE/powder HDPE and powder LDPE/powder HDPE. Influence of the filler of the resulting blends on hardness and micro-indentation hardness was investigated. Shore D hardness test and instrumented micro-indentation hardness test were performed and results compared. According to the measured data both tested material characteristics are significantly influenced by the amount of the filler. Hardness increased with increasing amount of the filler at both material combinations; however results of micro-indentation test shows little inconsistency in hardness of surface layer.

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