Experimental research on the feasibility of biodegradable polymeric insulating materials

Yoshimichi Ohki, Naoshi Hirai, S. Kaneko, S. Okabe

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Various environmental issues such as the global warming effect have become major public concerns. Eco-friendly biodegradable polymers have a potential ability to solve these problems. From this viewpoint, we have been studying various dielectric properties such as complex permittivity, electrical conductivity, dielectric breakdown strength, partial discharge (PD) resistance, and resistance to water imersion in comparison to the properties of low density polyethylene (LDPE) for the following various biodegradable polymers; starch ester (SE), poly-L-lactic acid (PLLA), polyethylene terephthalate succinate (PETS), polycaprolactone (PCL), polycaprolactone butylene succinate (PCLBS), polybutylene succinate (PBS), polybutylene succinate adipate (PBSA), polybutylene adipate terephthalate (PBAT), polyhydroxybutyrate/valerate (PHB/V), and their blends. Among the nine polymers investigated, PLLA and PETS are in the glass state at room temperature, while the other seven polymers are in the rubber state. Partly because of this reason, the permittivity and conductivity of PLLA and PETS are much lower than those of SE, PCL, PCL-BS, PBS, PBSA, and PBAT. In contrast to such large differences in conductivity and permittivity, all the polymers investigated have an almost similar impulse breakdown strength at room temperature. As for dc or ac breakdown, in which the conductivity should theoretically play a more significant role than in the impulse breakdown, SE, PLLA, and PETS show a relatively higher strength than the others. The results of PD resistance show that a good PD resistance can be achieved by the sample with a high crystallinity and a low permittivity, and that the PD resistance is ranked as LDPE > SE > PLLA ≅ PETS > PBS > PCL-BS. The durability of biodegradable polymers against water is significantly reduced by the increase in water temperature. Regardless of the water temperature, SE shows the best durability of the five kinds of biodegradable polymers investigated, namely, SE, PLLA, PCL-BS, PBS, and PETS. All three blend polymers of SE with PCL, PBSA, and PBAT show resistivity and ac breakdown strength much higher than the values requested for 600-V class insulated wires. By taking the above-mentioned results into account, it is sumarized that SE can be an electrical insulating material if the surrounding atmosphere is relatively mild, while PCL, PCL-BS, PBS, PBSA, PBAT, and PHB/V can be plasticizers for SE.

Original languageEnglish
Title of host publication43rd International Conference on Large High Voltage Electric Systems 2010, CIGRE 2010
Publication statusPublished - 2010
Event43rd International Conference on Large High Voltage Electric Systems 2010, CIGRE 2010 - Paris
Duration: 2010 Aug 222010 Aug 27

Other

Other43rd International Conference on Large High Voltage Electric Systems 2010, CIGRE 2010
CityParis
Period10/8/2210/8/27

Fingerprint

Polycaprolactone
Insulating materials
Starch
Esters
Lactic acid
Polyethylene terephthalates
Biodegradable polymers
Polymers
Partial discharges
Permittivity
Low density polyethylenes
Water
Durability
Insulated wire
Temperature
Plasticizers
Global warming
Polymer blends
Electric breakdown
Dielectric properties

Keywords

  • Biodegradable polymer
  • Blended polymer
  • Dielectric property
  • Plasticizer
  • Wire insulation

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Ohki, Y., Hirai, N., Kaneko, S., & Okabe, S. (2010). Experimental research on the feasibility of biodegradable polymeric insulating materials. In 43rd International Conference on Large High Voltage Electric Systems 2010, CIGRE 2010

Experimental research on the feasibility of biodegradable polymeric insulating materials. / Ohki, Yoshimichi; Hirai, Naoshi; Kaneko, S.; Okabe, S.

43rd International Conference on Large High Voltage Electric Systems 2010, CIGRE 2010. 2010.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Ohki, Y, Hirai, N, Kaneko, S & Okabe, S 2010, Experimental research on the feasibility of biodegradable polymeric insulating materials. in 43rd International Conference on Large High Voltage Electric Systems 2010, CIGRE 2010. 43rd International Conference on Large High Voltage Electric Systems 2010, CIGRE 2010, Paris, 10/8/22.
Ohki Y, Hirai N, Kaneko S, Okabe S. Experimental research on the feasibility of biodegradable polymeric insulating materials. In 43rd International Conference on Large High Voltage Electric Systems 2010, CIGRE 2010. 2010
Ohki, Yoshimichi ; Hirai, Naoshi ; Kaneko, S. ; Okabe, S. / Experimental research on the feasibility of biodegradable polymeric insulating materials. 43rd International Conference on Large High Voltage Electric Systems 2010, CIGRE 2010. 2010.
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N2 - Various environmental issues such as the global warming effect have become major public concerns. Eco-friendly biodegradable polymers have a potential ability to solve these problems. From this viewpoint, we have been studying various dielectric properties such as complex permittivity, electrical conductivity, dielectric breakdown strength, partial discharge (PD) resistance, and resistance to water imersion in comparison to the properties of low density polyethylene (LDPE) for the following various biodegradable polymers; starch ester (SE), poly-L-lactic acid (PLLA), polyethylene terephthalate succinate (PETS), polycaprolactone (PCL), polycaprolactone butylene succinate (PCLBS), polybutylene succinate (PBS), polybutylene succinate adipate (PBSA), polybutylene adipate terephthalate (PBAT), polyhydroxybutyrate/valerate (PHB/V), and their blends. Among the nine polymers investigated, PLLA and PETS are in the glass state at room temperature, while the other seven polymers are in the rubber state. Partly because of this reason, the permittivity and conductivity of PLLA and PETS are much lower than those of SE, PCL, PCL-BS, PBS, PBSA, and PBAT. In contrast to such large differences in conductivity and permittivity, all the polymers investigated have an almost similar impulse breakdown strength at room temperature. As for dc or ac breakdown, in which the conductivity should theoretically play a more significant role than in the impulse breakdown, SE, PLLA, and PETS show a relatively higher strength than the others. The results of PD resistance show that a good PD resistance can be achieved by the sample with a high crystallinity and a low permittivity, and that the PD resistance is ranked as LDPE > SE > PLLA ≅ PETS > PBS > PCL-BS. The durability of biodegradable polymers against water is significantly reduced by the increase in water temperature. Regardless of the water temperature, SE shows the best durability of the five kinds of biodegradable polymers investigated, namely, SE, PLLA, PCL-BS, PBS, and PETS. All three blend polymers of SE with PCL, PBSA, and PBAT show resistivity and ac breakdown strength much higher than the values requested for 600-V class insulated wires. By taking the above-mentioned results into account, it is sumarized that SE can be an electrical insulating material if the surrounding atmosphere is relatively mild, while PCL, PCL-BS, PBS, PBSA, PBAT, and PHB/V can be plasticizers for SE.

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