PMID- 31438502
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20200929
IS  - 1996-1944 (Print)
IS  - 1996-1944 (Electronic)
IS  - 1996-1944 (Linking)
VI  - 12
IP  - 17
DP  - 2019 Aug 21
TI  - An Experimental Study of the Crystallinity of Different Density Polyethylenes on 
      the Breakdown Characteristics and the Conductance Mechanism Transformation under 
      High Electric Field.
LID - 10.3390/ma12172657 [doi]
LID - 2657
AB  - In order to study the crystallinity of different density polyethylenes, this 
      paper conducts an experimental study on the transformation of the conductance 
      mechanism under a high electric field. In this experiment, X-ray diffraction 
      (XRD), differentials scanning calorimetry (DSC), direct current (DC) breakdown of 
      low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), 
      medium-density polyethylene (MDPE) and high-density polyethylene (HDPE), as well 
      as the conductivity characteristics under an electric field of 5-200 kV/mm are 
      tested. In addition, the electric field-current density curves of the four kinds 
      of polyethylene are fitted to analyze their conductance transition in non-ohmic 
      regions under different high field strengths, through applying the mathematical 
      formula of a variety of conductance mechanisms. The experimental results are as 
      follows: as the density of polyethylene increases, the crystallinity increases 
      continuously. Moreover, the continuous increase of crystallinity causes the 
      electric conduction flow under the same field strength to decrease significantly. 
      The field strength corresponding to the two turning points in the conductance 
      characteristic curve increases simultaneously, and the breakdown field strength 
      increases accordingly; through analysis, it is found that in the high field, as 
      the electric field increases, the conductance mechanism develops from the ohmic 
      conductance of the low field strength region to the bulk effect of the high field 
      strength region (Poole-Frenkel effect). Then, it develops into the electrode 
      effect to the high field strength (Schottky effect), although the threshold field 
      strength of this conductance mechanism transition increases with the increase of 
      crystallinity.
FAU - Zhou, Liwei
AU  - Zhou L
AD  - Harbin University of Science and Technology, Harbin 150080, China.
AD  - Key Laboratory of Engineering Dielectrics and Its Application Harbin University 
      of Science and Technology, Harbin 150080, China.
FAU - Wang, Xuan
AU  - Wang X
AD  - Harbin University of Science and Technology, Harbin 150080, China. 
      wangxuan@hrbust.edu.cn.
AD  - Key Laboratory of Engineering Dielectrics and Its Application Harbin University 
      of Science and Technology, Harbin 150080, China. wangxuan@hrbust.edu.cn.
FAU - Zhang, Yongqi
AU  - Zhang Y
AD  - Harbin University of Science and Technology, Harbin 150080, China.
AD  - Key Laboratory of Engineering Dielectrics and Its Application Harbin University 
      of Science and Technology, Harbin 150080, China.
FAU - Zhang, Peng
AU  - Zhang P
AD  - Harbin University of Science and Technology, Harbin 150080, China.
AD  - Key Laboratory of Engineering Dielectrics and Its Application Harbin University 
      of Science and Technology, Harbin 150080, China.
FAU - Li, Zhi
AU  - Li Z
AD  - Harbin University of Science and Technology, Harbin 150080, China.
AD  - Key Laboratory of Engineering Dielectrics and Its Application Harbin University 
      of Science and Technology, Harbin 150080, China.
LA  - eng
GR  - 51337002/National Natural Science Foundation of China/
GR  - 2016RQXXJ052/Innovative Foundation of Harbin under Contract/
PT  - Journal Article
DEP - 20190821
PL  - Switzerland
TA  - Materials (Basel)
JT  - Materials (Basel, Switzerland)
JID - 101555929
PMC - PMC6747557
OTO - NOTNLM
OT  - SCLC
OT  - breakdown strength
OT  - conduction mechanism
OT  - crystallinity
OT  - field strength
OT  - polyethylene
COIS- The authors declare no conflict of interest.
EDAT- 2019/08/24 06:00
MHDA- 2019/08/24 06:01
PMCR- 2019/08/21
CRDT- 2019/08/24 06:00
PHST- 2019/07/16 00:00 [received]
PHST- 2019/08/16 00:00 [revised]
PHST- 2019/08/19 00:00 [accepted]
PHST- 2019/08/24 06:00 [entrez]
PHST- 2019/08/24 06:00 [pubmed]
PHST- 2019/08/24 06:01 [medline]
PHST- 2019/08/21 00:00 [pmc-release]
AID - ma12172657 [pii]
AID - materials-12-02657 [pii]
AID - 10.3390/ma12172657 [doi]
PST - epublish
SO  - Materials (Basel). 2019 Aug 21;12(17):2657. doi: 10.3390/ma12172657.