PMID- 34451214
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20210831
IS  - 2073-4360 (Electronic)
IS  - 2073-4360 (Linking)
VI  - 13
IP  - 16
DP  - 2021 Aug 10
TI  - Measuring the Complex Permittivities of Plastics in Irregular Shapes.
LID - 10.3390/polym13162658 [doi]
LID - 2658
AB  - This work presents the measurement of the complex permittivities of high density 
      polyethylene (HDPE), linear low density polyethylene (LLDPE), low density 
      polyethylene (LDPE), polypropylene (PP), Nylon, and thermoplastic vulcanizates 
      (TPV) in irregular shapes at the microwave frequency. A Teflon sample holder was 
      employed to pack irregularly shaped plastic materials with various volumetric 
      percentages. The samples were put into a resonant cavity with an enhanced 
      electric field in its center, which is known as the enhanced-field method (EFM). 
      The resonant frequencies and the quality factors at different volumetric 
      percentages were measured by a network analyzer and compared with simulated 
      results using a full-wave simulator (high-frequency structure simulator (HFSS)). 
      Three simulation models, layer, ring, and hybrid, are proposed and compared with 
      the experimental results. It is found that the hybrid model (denoted as Z5R5) 
      with five heights and five radii in the partition is the most suitable. The 
      complex permittivities of six plastic materials were evaluated by the contour 
      maps of the HFSS simulation using the hybrid model. The measured complex 
      permittivities of the irregularly shaped polymers agree well with their 
      counterparts in bulk form.
FAU - Chao, Hsien-Wen
AU  - Chao HW
AD  - Department of Physics, National Tsing Hua University, 101, Section 2, Kuang Fu 
      Road, Hsinchu 300044, Taiwan.
FAU - Chen, Hua-Hsuan
AU  - Chen HH
AD  - Department of Physics, National Tsing Hua University, 101, Section 2, Kuang Fu 
      Road, Hsinchu 300044, Taiwan.
FAU - Chang, Tsun-Hsu
AU  - Chang TH
AUID- ORCID: 0000-0003-2501-3185
AD  - Department of Physics, National Tsing Hua University, 101, Section 2, Kuang Fu 
      Road, Hsinchu 300044, Taiwan.
LA  - eng
GR  - MOST 107-2112-M-007-015-MY3/Ministry of Science and Technology, Taiwan/
GR  - MOST 106-2622-E-007-021-CC2/Ministry of Science and Technology, Taiwan/
PT  - Journal Article
DEP - 20210810
PL  - Switzerland
TA  - Polymers (Basel)
JT  - Polymers
JID - 101545357
PMC - PMC8402015
OTO - NOTNLM
OT  - complex permittivity
OT  - contour mapping method
OT  - enhanced-field method
OT  - irregularly shaped
COIS- The authors declare no conflict of interest.
EDAT- 2021/08/29 06:00
MHDA- 2021/08/29 06:01
PMCR- 2021/08/10
CRDT- 2021/08/28 01:03
PHST- 2021/06/18 00:00 [received]
PHST- 2021/07/14 00:00 [revised]
PHST- 2021/08/05 00:00 [accepted]
PHST- 2021/08/28 01:03 [entrez]
PHST- 2021/08/29 06:00 [pubmed]
PHST- 2021/08/29 06:01 [medline]
PHST- 2021/08/10 00:00 [pmc-release]
AID - polym13162658 [pii]
AID - polymers-13-02658 [pii]
AID - 10.3390/polym13162658 [doi]
PST - epublish
SO  - Polymers (Basel). 2021 Aug 10;13(16):2658. doi: 10.3390/polym13162658.