J. Inst. Electrostat. Jpn.

, 30, 2 (2006) 95 100⺰   ᢥ↢ಽ⸃ᕈ㜞ಽሶ᧚ᢱࡐ࡝੃㉄ߩ㔚✢⛘✼߳ߩㆡ↪ߦ㑐ߔࠆၮ␆⊛ᬌ⸛ฬಾථ↵*,1㧘Ꮉ࿾ാ⾆*㧘ᧄ↰㓷ᄢ*㧘੗రஜੑ**㧘ጊർ㓉ᓕ*㧘↰ኪ૫㇢*
㧔2005 ᐕ 8 ᦬ 1 ᣣฃઃ; 2006 ᐕ 3 ᦬ 7 ᣣฃℂ㧕Basic Studies of Applications of Biodegradable
Polymer PLLA to Insulation of Electric Wires
Takuo NAKIRI*,1㧘Yuuki KAWACHI*㧘Masahiro HONDA*㧘Kenji IMOTO**
Takayuki YAMAKITA* and Yoshiro TAJITSU*(Received August 1, 2005; Accepted March 7, 2006)

We developed equipment for manufacturing a biodegradable-polymer-insulated cable with various functional
properties. Using this equipment, we manufactured a poly-l-lactic acid (PLLA)-insulated electric cable andevaluated its basic electrical insulation characteristics. The mean dielectric breakdown strength of the PLLA-insulated
electric cable was approximately 3.5 times that of a polyvinyl chloride-insulated electric cable (VV electric cable).
The result of bending and weathering tests using the developed PLLA-insulated electric cable showed that weobtained excellent characteristics at room temperature.
1.

ߪߓ߼ߦ↪᷷ᐲၞߦ޽ࠆߚ߼㧘⵾ຠࠍ቟ቯൻߔࠆߚ߼ߦߪ㧘ᵈᗧߔߴࡊ࡜ࠬ࠴࠶ࠢ⵾ຠ߇ᄙ㊂ߦ૶↪ߐࠇߡ޿ࠆ੹ᣣ㧘ડᬺߦ߽߈ὐ߽ᄙ޿㧚৻ᣇ㧘⃻࿷߹ߢߦ㧘PLLA ࠍ⭯⤑ࡈࠖ࡞ࡓߦߒᶖ⾌⠪ߦ߽㧘૶↪ᷣߺࡊ࡜ࠬ࠴࠶ࠢߩᑄ᫈ಣℂ߇ᄢ߈ߥ⺖㗴ߚ႐ว㧘ᓥ᧪ߩ⛘✼᧚ᢱߣߒߡࠃߊ⍮ࠄࠇߡ޿ࠆࡐ࡝ࠛ࠴࡟

1,2)㧚߹ߚ㒢ࠅ޽ࠆ⾗Ḯ࡮ࠛࡀ࡞ࠡ࡯ࠍ⛮⛯ߒߡ

ࡦ(PE)㧘᨞ᯅࡐ࡝ࠛ࠴࡟ࡦ(XLPE)㧘Ⴎൻࡆ࠾࡞(PVC)ߥߤߣ

૶޿⛯ߌࠆߚ߼ߦ㧘⾗ḮᓴⅣဳߩ␠ળᒻᚑ߇ᔅⷐߦߥߞߡ߈Ყセߒߡ㧘ߪࠆ߆ߦఝࠇߚ⛘✼ᕈ⢻ࠍ᦭ߒߡ޿ࠆߎߣ߇␜ߐߡ޿ࠆ㧚⃻࿷ߩ࿾⃿ⅣႺ໧㗴ࠍ⠨߃ࠆߣ߈㧘↢‛↱᧪ߩ↢ಽࠇߡ޿ࠆ 3,4)㧚߹ߚ㧘⠴Ḩᐲ߿⠴᷷ᐲߦኻߔࠆ቟ቯᕈ߽㧘ᓥ᧪⸃ᕈ㜞ಽሶߪ㧘࿯ფ߿᳓ਛߩᓸ↢‛ߦࠃࠅಽ⸃ߐࠇߡⅣႺ⽶ߩ੍᷹ࠃࠅఝࠇߚᕈ⾰߇ႎ๔ߐࠇߡ޿ࠆ 4)㧚

ߣߥߞߡ޿ࠆ⩄߇ዋߥ޿ߣ޿߁ℂ↱߫߆ࠅߢߥߊ㧘੩ㇺߩ⼏ቯᦠߦၮߠߊᚒ‫ߪޘ‬㧘PLLA ߩ਄⸥ߩ㔚᳇⛘✼ᕈ⢻߿⠴୥ᕈߩ⦟ᅢߥႎ

ੑ㉄ൻ὇⚛ឃ಴㊂ߩ೥ᷫ⟵ോࠍ㆐ᚑߔࠆಾࠅᧅߣߒߡ㧘ᦼᓙ๔ 1-4)ߦၮߠ߈㧘ታ↪ൻࠍㅴ߼ࠆߚ߼㧘ᧄ⎇ⓥࠍ߅ߎߥߞߚ㧚߇ᒝ߹ߞߡ޿ࠆ㧚޿߹᮸⢽ࡔ࡯ࠞ࡯߇↢↥૕೙ࠍᢛ߃ߡ቟ቯߒ߆ߒߥ߇ࠄ㧘ᄢ㊂↢↥ߐࠇߡ޿ߥ޿㜞ಽሶࠍ㧘ᣢሽߩᎿߒߚଏ⛎ࠍ࿑ࠈ߁ߣߒߡ޿ࠆ↢ಽ⸃ᕈ㜞ಽሶߦ㧘ࡐ࡝੃㉄ᬺ⊛ߥ⸳஻ࠍ૶޿㧘㐳޿㔚✢ࠍ⹜૞ߒߡ⹏ଔߔࠆߎߣߪኈᤃ㧔PLLA: L ဳࡐ࡝੃㉄㧕߇޽ࠆ㧚PLLA ߪࠕࠢ࡝࡞᮸⢽ߩࠃߢߪߥ޿㧚ߘߎߢ㧘ዋ㊂ߩ㜞ಽሶߢ◲නߦ㔚✢߇⹜૞ߢ߈ࠆ߁ߦ⎬ߊ㧘น᠌ᕈࠍⷐ᳞ߐࠇࠆ↪ㅜߦߪਇะ߈ߣ㧘੹߹ߢߪⵝ⟎ࠍ㐿⊒ߒ㧘㔚✢ߣߒߡߩታ↪⊛ߥ․ᕈ⹜㛎ࠍⴕ߃ࠆࠪࠬ⠨߃ࠄࠇߡ߈ߚ㧚߹ߚ㧘ࠟ࡜ࠬォ⒖ὐ᷷ᐲ߇ᣣᏱ⊛⵾ຠߩ૶࠹ࡓࠍ᭴▽ߔࠆߎߣࠍ⋡ᮡߦ⎇ⓥࠍㅴ߼ߚ㧚ߎࠇࠍ↪޿㧘
PLLA ࠍ⛘✼᧚ᢱߦㆡ↪ߒߚࡊࡠ࠻࠲ࠗࡊߩ㔚✢㧔PLLA 㔚ࠠ࡯ࡢ࡯࠼㧦ⅣႺ⺞๺㧘↢ಽ⸃ᕈ㜞ಽሶ㧘ࡐ࡝੃㉄㧘⛘✼㔚✢* 㑐⷏ᄢቇᄢቇ㒮Ꮏቇ⎇ⓥ⑼㧔564-8680 ᄢ㒋ᐭ็↰Ꮢጊᚻ
↸ 3-3-35㧕
Graduate School of Engineering, Kansai University, 3-3-35
Yamate-cho, Suita, Osaka 564-8680, Japan
1gc4d103@edu.kansai-u.ac.jp** ᩣᑼળ␠੗ర⵾૞ᚲ㧔602-8315 ੩ㇺᏒ਄੩඙੹಴Ꮉㅢ৾
ᧄ᧻᧲౉਄࡞⓭ᛮ↸ 501㧕Imoto Mechanical Engineering Co., Ltd., 501 Tsukinuke,Imadegawa, Kamikyou, Kyoto 602-8315, Japan✢㧕ࠍ⹜૞ߒߡ㧘㔚᳇⹜㛎㧘ᯏ᪾⹜㛎ࠍ㔚✢઀᭽ߢ߅ߎߥ޿5)‫ޔ‬PLLA ߩ㔚✢⛘✼᧚ᢱߣߒߡߩน⢻ᕈߦߟ޿ߡᬌ⸛ߒߚ㧚ߘߩ⚿ᨐࠍႎ๔ߔࠆ㧚
2.
2.1

㔚✢ߩ⹜૞
㔚✢ߩ⛘✼᧚ᢱ

㔚✢ߩ⛘✼᧚ᢱߣߒߡ૶↪ߒߚ PLLA ࡍ࡟࠶࠻ߩၮᧄ‛ℂ․ᕈߪ⴫㧝ߩߣ߅ࠅߢ޽ࠆ㧚96 (38)3022006

⴫ 1 PLLA ߩၮᧄ‛ℂ․ᕈ
Table 1 Basic physical properties of PLLA.

2.2melting point

166 ͠glass transition point

57 ͠mean molecular weight

20-22×104

rupture stress

76 MPa⹜૞ⵝ⟎

PLLA ࠍ㌃✢ߦㅪ⛯ⵍⷒߒߡ㔚✢ࠍ૞ࠆⵝ⟎ࠍ㐿⊒ߒߚ㧚

࿑2᛼ߒ಴ߒ࠳ࠗᧄⵝ⟎ߪᢙචࠣ࡜ࡓߩ㜞ಽሶߢ 3.5m ೨ᓟߩ㔚✢ࠍ૞ࠆߎߣ

Fig. 2 Extrusion die.

߇ߢ߈ࠆ㧚ߎࠇߦࠃࠅ⹜ᢱ߇ዋ㊂ߢ߽ࡊࡠ࠻࠲ࠗࡊߩ㔚✢ࠍ

2.3૞ࠆߎߣ߇ߢ߈ࠆࠃ߁ߦߥߞߚ㧚એਅߦߘߩ᭎ⷐࠍ␜ߔ㧚⹜૞ߒߚ PLLA 㔚✢ߩ᭴ㅧߪ⴫㧞ߩߣ߅ࠅߢ޽ࠆ㧚৻⥸ߦ⹜૞⚿ᨐ

࿑ 1 ߪ᷷ᐲ೙ᓮߐࠇߚ❑ဳߩ㔚✢ⵍⷒ᛼ߒ಴ߒⵝ⟎ߢ㧘PLᐢߊ૶ࠊࠇߡ޿ࠆ㔚✢ߣᲧセߔࠆߚ߼㧘ዉ૕ᄖᓘߣ⛘✼ෘࠍLA ࡍ࡟࠶࠻ࠍⲢ⸃ߒߥ߇ࠄࠬࠢ࡝ࡘ࡯ߢ࿶ജࠍട߃ߡ㔚✢

600V ࡆ࠾࡞⛘✼ࡆ࠾࡞ࠪ࡯ࠬࠤ࡯ࡉ࡞(VV: VV 㔚✢)ߩ✢ᔃ⴫㕙ߦⵍⷒߔࠆ᭴ㅧߦߥߞߡ޿ࠆ㧚ࠬࠢ࡝ࡘ࡯ㇱಽߦ 2 ࠞᚲߩⷙᩰࠍḰ↪ߒߡ‫ޔ‬ዉ૕ኸᴺ߇ 1.6mm ߩනᔃ⋧ᒰߣߒߚ 6)㧚

ߣ᛼ߒ಴ߒ࠳ࠗ߅ࠃ߮㌃✢ଏ⛎ญߦࡅ࡯࠲࡯ࠍขࠅઃߌߡ޿
ࠆ㧚ࠬࠢ࡝ࡘ࡯਄ㇱߩࡅ࡯࠲࡯ߢ PLLA ࡍ࡟࠶࠻ࠍエൻߐߖ㧘⴫ 2 PLLA 㔚✢ߩ᭴ㅧਅㇱߩࡅ࡯࠲࡯ߢᵹേᕈࠍ㜞߼ߡㆡᐲߥ᛼ߒ಴ߒ☼ᐲߦߔࠆ㧚

Table 2 Structure of PLLA-insulated electric cable.

࠳ࠗߩࡅ࡯࠲࡯ߪ᛼ߒ಴ߒߩ᷷ᐲࠍ৻ቯߦ଻ߟ௛߈ࠍߒߡ߅ࠅ㧘᧚ᢱߩုࠇ߿ಾࠇࠍ㒐޿ߢ޿ࠆ㧚ߘࠇߙࠇߩࡅ࡯࠲࡯Wire material

Annealed copper

Outside diameter of wire

1.6 mmInsulation material

PLLA

Thickness of insulation material

0.8 mm᷷ᐲߪ㧘r1͠ߩ♖ᐲߢ೙ᓮߒߡ߅ࠅ㧘PLLA ߇࠳ࠗߦ೔㆐ߔࠆ߹ߢߩ᷷ᐲಽᏓࠍᱜ⏕ߦ᭴ᚑߔࠆߎߣ߇ߢ߈ࠆ㧚ߎߎߢߪ࠳ࠗߩ᷷ᐲࠍ 230͠ߣߒߚ㧚ߐࠄߦ࠳ࠗ಴ญߦߪᕆㅦ಄ළߔ
ࠆߚ߼ߩ᳓಄ⵝ⟎ࠍขࠅઃߌߡ㧘᧚ᢱߩ⚿᥏ൻࠍ೙ᓮߒߡ޿
ࠆ㧚࿑㧞ߪ PLLA ࠍ㌃✢ߦ᛼ߒ಴ߔ࠳ࠗߩㇱಽࠍ␜ߔ㧚ߎߩ࠳ࠗߩ಴ญㇱಽߪ੤឵ߢ߈㧘ขࠅᦧ߃ࠆߎߣߢછᗧߩ⛘✼ෘߐߦ⺞ᢛߢ߈ࠆ㧚㌃✢ߪᏱߦ৻ቯߩࡃ࠶ࠢ࠹ࡦ࡚ࠪࡦࠍਈ߃ࠆ࠹ࡦ࡚ࠪࡦࠦࡦ࠻ࡠ࡯࡞࡝࡯࡞ࠍ⚻ߡ࠳ࠗߦଏ⛎ߐࠇ㧘Ꮞ߈ขࠅࡕ࡯࠲࡯ߢᏎ߈ขࠄࠇࠆ㧚㔚✢ߦⵍⷒߔࠆ PLLA ߩෘߐࠍ৻ቯߦߔࠆߚ߼ߦߪ㧘㌃✢ߩ⒖േㅦᐲࠍᱜ⏕ߦ⛽ᜬߔࠆᔅⷐ߇޽ࠆߩߢ㧘㜞♖ᐲߩࡕ࡯࠲࡯ㅦᐲ೙ᓮᯏ᭴ࠍ⸳ߌߡ޿ࠆ㧚

࿑3
࿑1㔚✢⹜૞ⵝ⟎㔚✢ᄖᓘߩ㐳ߐᣇะߩ৻᭽ᕈ

Fig. 3 Uniformity of external diameter ofFig. 1 Equipment for manufacturing

PLLA-insulated electric cable and VV electric cablebiodegradable-polymer-insulated electric cable.

in length direction.

97 (39)㔚✢ߩ㐳ߐᣇะߦ߅ߌࠆᄖᓘߩᄌൻߪ࿑ 3 ߦ␜ߔߣ߅ࠅߢ㧘ൻߪ৻ಾ⷗ࠄࠇߥ߆ߞߚ㧚PLLA ߪ࿕ߊߡᨵエᕈ߇ߥ޿ߣା

PLLA 㔚✢ߩ઀਄߇ࠅ♖ᐲࠍ VV 㔚✢ߣห⒟ᐲߦߔࠆߎߣ߇ߓࠄࠇߡ߈ߚ߇㧘ߎߩ⚿ᨐߪ㛳ߊߴ߈߽ߩߢ㧘ߘߩᨵエᕈߩߢ߈ߚ㧚⊒⃻ߪᄢ߈ߊᔕ↪ߩน⢻ᕈࠍ㐿ߊ߽ߩߣ㧘ߎߎߢ․ߦᒝ⺞ߒ⹜૞ߒߚ PLLA 㔚✢ߩᄖⷰࠍ࿑ 4 ߦ␜ߔ㧚ߎߩ㔚✢ߪ⛘✼ߚ޿㧚૕ㇱಽ߇ㅘ᣿ߢ޽ࠆߎߣએᄖߪ VV 㔚✢ߣ߶߷ห᭽ߩ઀਄߇
ࠅߢ㧘ዉ૕ߢ޽ࠆ㌃ߩ๟࿐ߦ PLLA ࠍဋ╬ߦⵍⷒߒߡ㐳ዤߩ

2.4㔚✢ߦߔࠆߎߣ߇ߢ߈ߚ㧚ߎߩ PLLA 㔚✢ࠍౝᓘ 50mm ߩࠦ㔚✢ࠍⵍⷒߒߡ޿ࠆ⁁ᘒߢߩ PLLA ߩ⛘✼ᕈ⢻ࠍᬌ⸽ߔࠆ

ࠗ࡞⁁ߦᦛߍࠆ⹜㛎ࠍⴕߞߚ⚿ᨐࠍ࿑ 5 ߦ␜ߔ㧚࿑ 5 ߆ࠄಽ߆ࠆࠃ߁ߦ㧘Ṗࠄ߆ߦᦛߍࠆߎߣ߇ߢ߈㧘PLLA ߩഀࠇ߿⊕㔚᳇⹜㛎⚿ᨐ

ߚ߼㧘੤ᵹ㔚࿶⎕უ⹜㛎ࠍⴕߥߞߚ 5,7)㧚
࿑ 6 ߩࠃ߁ߦ PLLA 㔚✢ߣ VV 㔚✢ߩ⛘✼૕⴫㕙ߦࠛࡐࠠࠪߢࠬ࠻࡟ࠬࠦ࡯ࡦࠍ૞ࠅ㧘㌁ࡍ࡯ࠬ࠻ߣࠕ࡞ࡒ▗ߢ⴫㕙㔚ᭂࠍ᭴ᚑߒߡ㧘࿑ 7 ߩ࿁〝ߢዉ૕ߣߩ㑆ߦ⺖㔚ߒߚ 5,7)㧚

࿑4

PLLA 㔚✢(਄)ߣᲧセ↪ VVF

Fig. 4 PLLA-insulated electric cable (top) and VV
electric cable placed as reference (bottom).

࿑5࿑6⹜㛎㔚ᭂ

Fig. 6 Sample for ac dielectric breakdown test.

PLLA 㔚✢ߩᦛߍᕈ

Fig. 5 Flexural property of PLLA-insulated electric cable.

98 (40)

3022006⹜ᢱᢙߪߘࠇߙࠇ㧡ὐߢ޽ࠆ㧚⹜㛎⚿ᨐߪ࿑ 8 ߩߣ߅ࠅߢ㧘
PLLA 㔚✢ߩ੤ᵹ⎕უᒝᐲߩᐔဋ୯ߪ 110kV/mm㧘Ყセߦ↪
޿ߚ VV 㔚✢ߪ 30kV/mm ߢ޽ࠅ㧘PLLA 㔚✢ߪ 3.5 ୚߽ߩ⛘✼ᒝᐲࠍ᦭ߒߡ޿ࠆߎߣ߇ࠊ߆ߞߚ 2-6)㧚JIS C3342 6)ߦ߅޿ߡ㧘㔚✢ߪ 1,500V ߩ㧡୚ߩ⹜㛎㔚࿶(ࠬࡄ࡯ࠢߦࠃࠆ⠴㔚࿶ᣇᴺ)
ߦ⠴߃ࠆߎߣ߇ⷙቯߐࠇߡ߅ࠅ㧘ߎࠇࠍḩ⿷ߔࠆߦߪ⚂9.3kV/mm એ਄ߩ⛘✼ᒝᐲ߇ᔅⷐߢ޽ࠆ㧚੤ᵹ⎕უߩᦨૐ୯
ߪ PLLA 㔚✢߇ 100kV/mm㧘VV 㔚✢ߪ 13kV/mm ߢ޽ࠅ㧘ਔᣇߣ߽ JIS ߩⷙቯࠍචಽ਄࿁ߞߡ޿ࠆߎߣ߇⏕⹺ߢ߈ߚ㧚એ਄ࠃࠅ㧘ᓥ᧪ߩ VV 㔚✢ߣห╬ߩ⠴㔚࿶ᕈ⢻ࠍታ⃻ߔࠆߦߪ㧘
࿑7੤ᵹ⎕უ⹜㛎࿁〝

Fig. 7 Circuit for ac dielectric breakdown test.

⛘✼ෘ߇⚂㧟ಽߩ㧝ߢߔ߻ߎߣߦߥࠆ㧚߹ߚᓥ᧪ߩ⚻㛎ೣߢ⸒߃߫㧘⭯⤑ൻࠍㅴ߼ࠆߎߣߢ⵾ㅧㆊ⒟ߩਇᢛߩዉ౉߽ᷫࠅ㧘ታ㓙ߦߪߐࠄߦ⛘✼ෘߩૐᷫൻ߇࿑ࠇࠆ㧚⚿ᨐߣߒߡ㔚✢ߩ⛘✼᧚ᢱߩ૶↪㊂߇⪺ߒߊૐᷫߒߡ⋭⾗Ḯߦߟߥ߇ࠆߣ޿߃ࠆ㧚੤ᵹ㔚࿶⎕უ⹜㛎ߦࠃࠆ⎕უὐߩ᭽⋧ߪ࿑ 9 ߩߣ߅ࠅߢ
޽ࠆ㧚⎕უὐߩᄢ߈ߐ㧘὇ൻߩ⒟ᐲߦᄢᏅߪߥߊ㧘⎕უ⋥ᓟߩࠕ࡯ࠢ᡼㔚ߦࠃࠆ⊒Ἣ㧘⥄ᏆᶖἻ߽ห⒟ᐲߢ޽ߞߚߩߢ㧘
PLLA 㔚✢ߪ VV 㔚✢ਗߩ቟ోᕈ߇ᦼᓙߢ߈ࠆ߽ߩߣ⠨߃ࠄࠇࠆ㧚
2.5ᯏ᪾⹜㛎⚿ᨐᯏ᪾ᕈ⢻ࠍᬌ⸽ߔࠆߚ߼㧘࿑ 10 ߦ␜ߔᦛߍ⹜㛎ⵝ⟎ 8)ࠍ↪޿ߡ➅ࠅ㄰ߒᦛߍ⹜㛎ࠍ߅ߎߥߞߚ㧚ࡑࡦ࠼࡟࡞ߩ⋥࿑8PLLA 㔚✢ߣ VV 㔚✢ߩ੤ᵹ⎕უ㔚⇇
Fig. 8 AC breakdown strength.

ᓘߪ 30mm ߢ㧘㔚✢ᄖᓘߩ⚂ 10 ୚ߢ޽ࠆ㧚
PLLA 㔚✢ࠍ࿑ 11 ߩࠃ߁ߦࡑࡦ࠼࡟࡞ߦᴪߞߡ 90 ᐲዮᦛߐߖߚ޽ߣ⋥✢⁁ߦᚯߒ㧘ᰴߦ෻ኻ஥ߦ 90 ᐲዮᦛߐߖߡరߩ
⋥✢⁁ߦߔࠆᠲ૞ࠍ㧡⑽߆ߌߡ߅ߎߥ߁㧚ߎࠇߦࠃߞߡഀࠇ߿⊕ൻߥߤߩᄌൻࠍⷰኤߒߡᦛߍᕈ⢻ࠍ⹏ଔߒߚ㧚ߐࠄߦⵍⷒᓟߩᤨ㑆⚻ㆊߦࠃࠆᄌൻࠍߺࠆߚ߼ߦ㧘⹜૞⋥ᓟߦ 1 ࿁㧘ߘߩᓟ 2 ᤨ㑆߅߈ߦ 12 ᤨ㑆߹ߢߘࠇߙࠇ 1 ࿁㧘ߘߒߡ 12 ᤨ㑆ᓟߦ 1 ࿁㧘ߐࠄߦߘߩᓟ 24 ᤨ㑆߅߈ߦ 120 ᤨ㑆߹ߢߘࠇߙ
ࠇ 1 ࿁ߕߟว⸘ 12 ࿁ߩ➅ࠅ㄰ߒᦛߍࠍਈ߃ߚ㧚ᦛߍࠍਈ߃ࠆ

(a)(b)
࿑9੤ᵹ㔚࿶⎕უ⹜㛎ߦࠃࠆ⎕უὐߩ᭽⋧㧔a㧦PLLA 㔚✢㧘b㧦VV 㔚✢㧕Fig. 9 State of breaking point of cable after ac
dielectric breakdown test.
(a) PLLA-insulated cable and (b) VV electric cable.

࿑ 10ᦛߍ⹜㛎ⵝ⟎

Fig. 10 Equipment for bending test.

99 (41)ߚ߮ߦ㧘㔚✢ߩ⴫㕙ࠍ㗼ᓸ㏜ߢⷰኤߒߚ㧚ߎߩ⚿ᨐ㧘⹜૞⋥߹ߢߩ➅ࠅ㄰ߒᦛߍࠍਈ߃ߚߎߣߢ⊕ൻ߇↢ߓߚ᭽ሶࠍ

ᓟ 96 ᤨ㑆߹ߢߪⵍⷒߒߚ PLLA ߦᄌൻ߇⹺߼ࠄࠇߥ߆ߞߚ㧚࿑  ߦ␜ߔ㧚⹜૞ᓟ 120 ᤨ㑆⚻ߞߚ PLLA 㔚✢ߦ㧘࿑ 12 ߦ␜ߔࠃ߁ߥ
ࠊߕ߆ߥ⊕ൻ߇⷗ࠄࠇߚ㧚⊕ൻߩ᭽ሶࠍㅊⓥߔࠆߚ߼ߦ㧘PLLA 㔚✢ࠍ 2 ᨎߩ஍శ᧼ߢ᜽ࠎߢ㧘PLLA ⛘✼૕ߦ↢ߓߚ஍శߩᄌൻࠍⷰኤߒߚ㧚PLLA ߪടᾲ᛼ߒ಴ߒߒߚ޽ߣ㧘ᤨ㑆ߩ⚻ㆊߣߣ߽ߦ⚿᥏ൻ߇ㅴࠎߢ㔚✢ߩ⛘✼․ᕈߦᄢ߈ߥᓇ㗀ࠍਈ߃ࠆߩߢ㧘ߎߎߢߪ⚻ㆊᤨ㑆ࠍ㊀ⷞߒߚ㧚࿑ 13 ߪ㧘ਅ߆ࠄ⹜૞⋥ᓟ㧘24 ᤨ㑆ᓟ㧘72 ᤨ㑆ᓟ㧘120 ᤨ㑆ᓟߩ PLLA 㔚✢ߩ஍శࠍ౮⌀ߦ᠟ߞߚ߽ߩߢ޽ࠆ㧚㔚✢⵾૞߆ࠄߩᤨ㑆⚻ㆊߣߣ߽ߦ஍శㇱಽ߇㐳ߊߥߞߡ߅ࠅ㧘ߎࠇߪ PLLA ߩ⚿᥏ൻ߇ㅴߺ೰ᕈ߇ᄢ߈ߊߥߞߡ޿ࠆߎߣࠍ␜ໂߔࠆ 1,2) 㧚࿑ 13PLLA 㔚✢⛘✼૕ߦ↢ߓߚ஍శߩ᷹ⷰ౮⌀(ਅ߆ࠄ⹜૞⋥ᓟ㧘24,72,120 ᤨ㑆ᓟ)

2.6⛘✼ෘߐߩᏅߦࠃࠆᦛߍᕈ⢻ߩᲧセ⛘✼ෘߐࠍᄌ߃ߡ೨ㅀߣห᭽ߩᣇᴺߢᦛߍᕈ⢻ࠍᬌ⸽ߒߚ㧚⚿ᨐߪ࿑  ߩߣ߅ࠅ 2..# ߩ⛘✼ෘࠍዊߐߊߔ

Fig. 13 Observation photograph of polarized light
generated on PLLA-insulated electric cable 0, 24, 72
and 120 hours after fabrication (from bottom to top).

ࠆߎߣߢ㧘⊕ൻ߹ߚߪഀࠇ߇↢ߓߦߊߊߥߞߡ޿ࠆ㧚ߟ߹ࠅ㧘㔚✢ߩ⛘✼⊹⤑ࠍ⭯ߊߒߡ޿ߊߎߣߢᭂ߼ߡ
⦟ᅢߥᦛߍ․ᕈࠍ␜ߔࠃ߁ߦߥߞߚ㧚ߎߩ⚿ᨐ㧘ߐࠄߦ⛘✼ෘࠍ⭯ߊߢ߈ࠇ߫㧘ᨵエᕈߦఝࠇߚ 2..# 㔚✢ࠍታ↪
ൻߢ߈ࠆน⢻ᕈ߇㜞޿ߎߣ߇ࠊ߆ߞߚ㧚2..# 㔚✢ߦᭂ㒢࿑ 14

PLLA ⛘✼ෘߐߣ⊕ൻߦ⥋ࠆᦛߍ࿁ᢙ

Fig. 14 Relationship between PLLA thickness andnumber of bending repetitions before whitening.

࿑ 11Fig. 11➅ࠅ㄰ߒᦛߍ⹜㛎ࠨࠗࠢ࡞One cycle of continuous bending test.

࿑ 15
࿑ 12Fig. 12➅ࠅ㄰ߒᦛߍߦࠃࠆ⊕ൻWhitening due to repeated bending.

Fig. 15.

30 ࿁ᦛߍ⹜㛎ᓟߩ PLLA 㔚✢

Surface of PLLA-insulated electric cable
after being bent 30 times.

100 (42)2.730㜞᷷㜞Ḩ㔓࿐᳇⹜㛎⚿ᨐ

23.

2006

߹ߣ߼

PLLA 㔚✢ࠍ㜞᷷ᐲ‫ޔ‬㜞Ḩᐲߩ㔓࿐᳇ਛߦ⟎߈‫ߩߘޔ‬ᕈ⁁

ᄢ㊂↢↥ߐࠇߡ޿ߥ޿㜞ಽሶࠍ㧘ᣢሽߩᎿᬺ⊛ߥ⸳஻ࠍ૶ᄌൻࠍⷰኤߒߚ㧚ෳ⠨ߣߒߡ‫ޔ‬VV 㔚✢ߢ߽߅ߎߥߞߚ‫ߎޕ‬޿㧘㐳޿㔚✢ࠍ⹜૞ߒߡ⹏ଔߔࠆߎߣߪኈᤃߢߪߥ޿㧚ߘߎߩ⹜㛎ߩߚ߼ߦએਅߩࠃ߁ߦ⹜ᢱࠍḰ஻ߒߚ㧚PLLA 㔚✢ࠍߢ㧘ዋ㊂ߩ㜞ಽሶߢ◲නߦ㔚✢߇⹜૞ߢ߈ࠆⵝ⟎ࠍ㐿⊒ߒ㧘㐳ߐ 400mm ߦಾࠅขࠅ㧘㜞Ḩᐲߩ㔓࿐᳇ߦ⟎ߊߩߢ㧘㔚✢㔚✢ߣߒߡߩታ↪⊛ߥ․ᕈ⹜㛎ࠍⴕ߃ࠆࠪࠬ࠹ࡓࠍ᭴▽ߔࠆ┵ㇱࠍࠛࡐࠠࠪߢࠪ࡯࡞ߒߡ㧘ዉ૕ߣ⛘✼૕ߩ㑆ߦ᳓ಽ߇౉ߎߣࠍ⋡ᮡߦ⎇ⓥࠍㅴ߼ߚ㧚ߎߎߢߪ㧘ታⷙᮨߩ PLLA 㔚✢ࠆߩࠍ㒐ᱛߒߚ㧚ࠍ⵾૞ߒߡ⹜㛎ߒߚ⚿ᨐ㧘ߟ߉ߩߎߣ߇᣿ࠄ߆ߦߥߞߚ㧚㧝㧕Ḩᐲߩᓇ㗀(1) PLLA 㔚✢⹜૞ⵝ⟎㧔60 ࠣ࡜ࡓߢ 3.5m ߩ㔚✢߇⵾૞น⢻㧕਄⸥ߩ⹜ᢱࠍ᷷ᐲ 20͠㧘Ḩᐲ 90%ߦ⸳ቯߒߚᕡ᷷ᕡḨᮏౝࠍ㐿⊒ߒ㧘ዋ㊂ߩ᧚ᢱߢዉ૕ో๟ߦ৻᭽ߥෘߐߩ PLLA ⵍⷒ

ߦ 96 ᤨ㑆⟎޿ߚ㧚ߘߩᓟ㧘࿑ 11 ߢ␜ߒߚ᛬ࠅᦛߍ⹜㛎ࠍⴕࠍߔࠆߎߣࠍน⢻ߦߒߚ㧚ߥߞߚ㧚ߘߩ⚿ᨐ㧘࿑ 11 ߢ␜ߒߚ⚿ᨐߣ߶߷หߓߢ㧘᛬ࠇߚ(2) PLLA ߪ⎬޿⚛᧚ߣ⷗ࠄࠇߡ߈ߚ߇㧘PLLA 㔚✢ߪ⛘✼ෘࠅ㧘⊕ൻߒߚ⹜ᢱߪᱴߤߥ߆ߞߚ㧚ߎߩߎߣ߆ࠄ㧘ቶ᷷ߢߪࠍ᳢↪ߩ VV 㔚✢ߩ 2 ಽߩ 1 એਅߦߔࠆߎߣߢ㧘ᦛߍᕈ߇⪺Ḩᐲ߇ PLLA 㔚✢ߦᱴߤᓇ㗀ࠍਈ߃ߥ޿ߎߣ߇ಽ߆ߞߚ㧚ߎߒߊะ਄ߔࠆߎߣࠍ⷗಴ߒߚ㧚߹ߚ PLLA 㔚✢ߩ⠴㔚࿶ᒝᐲ4)ࠇߪᄢᧁࠄߩႎ๔ 㧘⛘✼ᕈߦߟ޿ߡ߽ቶ᷷ߢߪḨᐲߩᓇ㗀4)߇ߥ޿ߎߣߣ⍦⋫ߒߥ޿ 㧚ߪ VV 㔚✢ߩ 3.5 ୚ߢ޽ࠆߎߣࠍ⏕⹺ߒߚߩߢ㧘⛘✼ෘࠍዊߐߊߒߡ߽㔚᳇⊛ߥ໧㗴ߪߥ޿ߣ⠨߃ࠄࠇࠆ㧚㧞㧕㜞᷷㧘㜞Ḩᐲ(3) 㜞᷷㧘㜞Ḩᐲߩ㔓࿐᳇ਅߢߪ㧘PLLA 㔚✢ߩో㐳ߦࠊߚߞ਄⸥ߩ⹜ᢱࠍ㧘᷷ᐲ 70͠㧘Ḩᐲ 90%ߦ⺞ᢛߒߚᕡ᷷ᕡḨᮏߡഠൻ߇⷗ࠄࠇߚ㧚㐳ᦼ቟ቯ㕙ߦ߅޿ߡ㧘PLLA 㔚✢ߦߪᡷ

ౝߦ 96 ᤨ㑆⟎޿ߚ㧚⚿ᨐߪ࿑ 16 ߦ␜ߔߣ߅ࠅ㧘ᕡ᷷ᕡḨᮏ߆ࠄขࠅ಴ߒߚ PLLA 㔚✢ߩో㐳ߦࠊߚߞߡ⊕ൻ߇⷗ࠄࠇߚ㧚ༀߔߴ߈ߣߎࠈ߇޽ࠆߣᕁࠊࠇࠆ㧚એ਄ߩࠃ߁ߦ㧘PLLA ߪ㔚✢ߩ⛘✼᧚ᢱߣߒߡߩน⢻ᕈࠍᜬߟߎߣࠍታࠨࠗ࠭ߢታ⸽ߔࠆߎߣ߇ߢ߈ߚ㧚↢ಽ⸃ᕈ㜞ಽሶߪⅣႺ⽶⩄߇ዊߐߊ‫↪૶ޔ‬㊂ࠍᷫࠄߔߎߣ߇ߢ߈ࠆߣ޿߁ⷰὐ߆ࠄ߽㧘ߘߩታ↪ൻߪᦸ߹ࠇࠆ㧚⻢ㄉᧄ⎇ⓥߩ৻ㇱߪᢥㇱ⑼ቇ⋭⑼ቇ⎇ⓥ⾌⵬ഥ㊄ߢⴕࠊࠇߚ㧚ෳ⠨ᢥ₂1) G. Scott: Biodegradable Plastics and Polymers, Elsevier,London (1994)
2) C. Gebelein and C. Carraher: Biotechnology and BioactivePolymers, Plenum Press, New York (1994).
࿑ 16㜞᷷ᐲ㜞Ḩᐲ㔓࿐᳇߆ࠄขࠅ಴ߒߚ
PLLA 㔚✢(਄)ߣ VV 㔚✢

Fig. 16 PLLA-insulated (top) and VV (bottom)
electric cables taken out of high-temperature andhigh-humidity environment.
-temperature and high-humidity environment.
߹ߚ 6㨪7mm ߅߈ߦ㧘ዉ૕ߦ㆐ߔࠆ߭߮ഀࠇ߇↢ߓߡ޿ߚ㧚ߎࠇߪ㧘PLLA ߩࠟ࡜ࠬォ⒖᷷ᐲ߇ 60͠㧘⚿᥏ൻ᷷ᐲ߇ 90͠೨ᓟߩߚ߼㧘⚿᥏ൻߥߤ߇ࡒࠢࡠߦଦㅴߐࠇߚ⚿ᨐߣᕁࠊࠇࠆ1-4)

3) T. Nakagawa, T. Nakiri, R. Hosoya and Y. Tajitsu: IEEETrans. Ind. Appl., 40 (2004) 1020
4) ೨㊁ᵏᱜ, ጊญ㓶਽, ᐔ੗⋥ᔒ, ↰ਛ␢ᝰ, ᄢᧁ⟵〝, ↰ኪ૫㇢, ะ⇧᡽ౖ, ጟㇱᚑశ: 㔚᳇ቇળ⺰ᢥ⹹ A, 125-3 (2005)
2545) ㅦ᳓ᢅᐘ: 㧯㨂ࠤ࡯ࡉ࡞, ࠦࡠ࠽␠ (1995)
6) JIS C3342 600V ࡆ࠾࡞⛘✼ࡆ࠾࡞ࠪ࡯ࠬࠤ࡯ࡉ࡞(VV)(1993)
7) A. Haddad and D. Warne:

AdvancesinHighVoltage㧚৻ᣇ㧘VV 㔚✢ߪ೨ㅀߩᦛߍ⹜㛎ⵝ⟎ߦࠃࠆ 20 ࿁ߩEngineering, Institution of Electrical Engineers, London (2004)➅ࠅ㄰ߒᦛߍࠍ߅ߎߥߞߚ޽ߣߢ߽㧘ᄌൻ߇⷗ࠄࠇߥ߆ߞߚ㧚8) JIS C3005 ࠧࡓ࡮ࡊ࡜ࠬ࠴࠶ࠢ⛘✼㔚✢⹜㛎ᣇᴺ (1993)