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Z® ÚæÂÆ& ®®B polytertrafluoro ethylene(PTFE), perfluoroalk- oxy(PFA), ethylene tetrafluoroethylene(ETFE), (FEP)fluoroethylenepropyl ene n G’² ÂÚ®Æ, 6~ ÿ® ²Ê ª[r²ê R² 300 × Ê® ‹fš lê PTFE n– PFA nV ÿr:.⁸ Ê: PTFE n– PFA nê û† Fã ÿ ~V 260 ×& B

®B JΪ& VÊ k² ‡š JÊê ْ² ¢zŽ ޒî, :ÿWÎ ®N²r û† J‡& V®B FÂr J6ê $  

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ê ْ² 3Wr:. N Væ:– PTFE n šÚ(film, 300 .m)R PFA n ^ã ª[(coating film, 25 µm)š V’², û† JΪ

& ®² ’ª¯W ‡ e ²Ê ‡® ªÒ Vw®† Z²

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*Department of Polymer Engineering, Chungnam National University, 220, daeduk, Daejeon 305-764, Korea

**Reliability of Assessment Center, Korea Research Institute of Chemical Technology, Daejeon 305-600, Korea (Received November 25, 2004;accepted January 14, 2005)

S¨Ü PTFE e PFA G® Þânê ²V Fã ÿ ~V 260 ×& B®ê 6~ J‡ 6Úæ â²r, N F Â&r nßr 280 ×, 7R Z® JΪ& ®Êr ÿÚ² JW žk‡Ê v~š Vw®V:. NBî †W k

, ‹f e JÚÊ r2 ~ G® âW ’‡Ê v~š ®N®ê †² JW žk‡– N FÂ&r nßr ª [’²r® ²Êg_W, NŽ *ŽöZ, úÂ Ús& ®² ëš †V®Ê ÿÚ® ®:ê ÙÊ «Î Rê BW² ²Ê *ŽöZ® æR ^ã†& V² g{® æ:š W®6 Þ:.

Abstract:Fluoropolymer of PTFE and PFA etc. is a heat resistance polymeric material that it is known as that maximum continuous use temperature reaches for 260 Ž. It was observed that these polymers had the enough thermal stability so enough that it was kept by thermal aging of 280 Ž/7 weeks too in this study. However, such thermal stability means that bulk material property is kept such as mechanical strength, melting point and initial pyrolysis temperature etc. If these polymers are evaluate by coating property such as surface contact angle, surface morphology, surface scratch, thing that heat resistance is not enough was confirmed in this study. Thermal aging of flouropolymer coating was achieved by gear aging oven that the exchange rate of air was controlled, and the analysis results were indicating serious damage of surface morphology and adhesive strength on metal substrate.

Keywords: thermal stability, fluoropolymer coating, interface adhesion.

†To whom correspondence should be addressed. E-mail: kychoi@krict.re.kr

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n Þ:. N FÂ& ÿr PTFE n– PFA nê V²WÎ J‡ Þân ª[r²r, 260 ×® Fã ÿ ~– 300»330 ×

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Table 1. Typical Properties of Teflon Fluoropolymers

Property Teflon PTFE Teflon PFA Teflon ETFE Teflon FEP

Specific G ravity, g/cm³ 2.15 2.15 1.76 2.15

Tensile Strength, psi 3000b5000 3600 5800b6700 3400

Elongation, % 300b500 300 150b300 325

H ardness, Shore D 50b65 60 72 56

Taber A brasion, m g. cycle 12 - - 14.8

C oefficient of Friction Static, D ynam ic

0.12b0.15 0.05b0.10

0.2 -

0.24b0.5 0.3b0.4

0.12b0.20 0.08b0.3 C ontact A ngle, w ater, degrees 104b111 104b111 90b100 95b105

M elting Point, ~ 327 306 267 260

C ure Tem perature, ~ 379b429 379b399 302b323 360b385 M ax, U se Tem p,~

C ontinuous, Interm ittent 260, 316 260, 288 149, 199 204, 232 Therm al C onductivity,W /m .k 0.5 0.19 0.24 0.20

Therm al Expansion, ppm /~ 100

Water A bsorption, % in 24 hr <0.01 <0.03 <0.03 <0.01

M V TR ,g/100 sq - - - 0.40

– 6~Ê š"®â óV®ê ûš JB b’²¾ 280 ×/7RZ

® JΪ ÆÊ ®&r, :.r Þân® ’W, ª¯W ‡

Ê ÿÚÞ vn6 Þ¢š î6 Þ:. JΪ 2Z R&

†Î k– 6~® óV Z–, Þân šÚ® JΪ Rk

&r vrv n Þê Þân® ª¯W Jª& ®² ÚæZ V¦

¿¹¹Bê ÒÖ ² â‡r ÛæZ® ‹& ®² 6~ â þR Ò &Β² 3W¶ n Þ:.

280 ×&r 7RZ JΪr Þân šÚR ª[® ²ÊÖ&

r 2"Ò š>®B nßr 2~RJ Ús Rê, Figure 2

&r JBR6 Þê ÙR oÊ, Þân šÚ® &ê JΪ î& ®² ªV ¢š JBRê Ù& n®B, ª[® 

&ê JΪ î& ®®B ÿ‹ ~ e kªV óV®ê çš JBR6 Þ:. Êê Þân šÚRê B, ª[– J Ϊ î& ®®B n Ö® kªV êVW’² ßn

¢š îê ْ², ÊO nV ÞÿÚ² Jî Ê{š V

6 Þ¢š îê ÙÊ:.¹² ÊB² Ês– ² ßr ÊO ª[ 2"® 2~RJ& ®² VJ e W® r®

:.š ®B 1~ VJ® ‹fR 2~ VJ® ‹f e W k ª ~V WW 310.0, 312.2, 287.5 ײ  R– î Ö¿®

ê ÙÊ:. NBî JŠâ Ús& ®² JÚÊ Æ/® Ús Rê

šÚR ª[ þ¦&r JÚÊ® r2 ~(onset temperature)–

²V ÚÊ ~ G&r Æ ªV ¢š «Î®ê ÙÊ:. J Ϊ îr šÚ® †² JÚs Rê V¦¿ Bê Úæ

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š †rö³ ®ê ÙÊ:.

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²Ê® ÚÛ² ’ª¯W Jª Bê ªÒ nW®ê ْ²

15-19

Þâ n® JªV â Ê ®& ßv  –COOH(1810 e 1760 cm^-1) e –COF(1860 cm^-1)o– ªr Vû†Ò WÎvÚg Ús úïR &r «Î¶ n Þ:. Figure 4ê Þân ª[

® JΪ Z® ²ÊÖ WÎvÚgÚs úïRš 2500»1700 cm^-1 êZ&r š¦² ْ², N :.® JΪ& ®®B ª[

® ²ÊÊ ª¯W’² Jªn:ê +V :ê ٚ «Î

®6 Þ:. Ê Vw Rê Figure 2® 2~RJ Ús e Figure 1. Influence of thermal aging time on the tensile strength (:, ;)

and the elongation (1, 0) of fluoro- polymer (PTFE) film at 160 × (:, 1) and 280 × (;, 0).

# 3# 4# 5# 6# 7# 8# 9# :# ;#

Time (week) Tensile strangth (kgf/cm2) ^:#

9#

8#

7#

6#

5#

4#

3#

Elongation (%)

733#

633#

533#

433#

3#

Figure 2. Changes in melting behavior of fluoro-polymers by thermal aging. Non-aged vs aged sample at 280 × / 7 weeks. (a) Fluoropolymer (PTFE) film and (b) Fluoropolymer (PFA) coating.

# 583# 5:3# 5<3# 643# 663# 683#

Temperature (×) (a)

Heat flow (W/g)

0315#

0317#

0319#

031;#

0413#

0415#

0417#

# 583# 5:3# 5<3# 643# 663# 683#

Temperature (×) (b)

Heat flow (W/g)

0315 0319 031;

0413 0415

Figure 3. Influence of thermal aging time on the contact angle of fluoropolymer (PTFE) film (1, 0) and fluoropolymer (PFA) coating (;) at 160 × (1) and 280 × (0, ;).

3# 4# 5# 6# 7# 8# 9# :# ;#

Time (week)

Contact angle (°)

473#

463#

453#

443#

433#

<3#

;3#

:3#

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²ê, ª[ Öښ ʲ’² ^ Ú®B wk² JŠâ gÚsë(TGA)® Ús RV JBRê ÙîR, ª[& B

¾r N® nr‡ ’(400 ×Ê® nr ¾š †V’² 1.4%, Þân šÚ® &ê 0.1%)Ê JΪ î& ®®B †ªn

rΠْ² 3WnÆ, Ê ⇠¿Ê ÖÇÞ® kr ÆW :Ê JΪ î g® JW ⪠þR& ®®B ²Ê þJ²

V ²Êê Rkš JBRê ْ² 3Wr:. Ž6² Ê ª [& ÿr Þân(PFA)® ÿ‹ ~ê 310.0 ×, kª ~

ê 292.7 ײ Vwn:.

ª[– ^㠆&®  k2ʲ šÚ"Ò †W ’‡Ê lê ®NV gê2n  š n Þ:. nÊ& ª[r& Þrê

^㠆& V² g{® vV gê² ’W ‡Ê nî, Ê& V² V e FÂÒ nß¾& Þ ª[r® ^㠆&

V² Ê g{š k«Þ wk¶ n Þê vþ² ëÊ ~

Figure 4. Formation of hydroxyl group at fluoro-polymer surface by thermal aging, non-aged (--) and aged (-) at 280 ×/7weeks.

Transmittance (%)

#5933# 5633# 5333# 4:33#

Wavenumbers (cm^-1)

Figure 5. Surface images of fluoropolymer(PTFE) film after thermal aging at 280 × (Ý1,000). (a) non-aged (b) aged for 1 week, (c) aged for 3 weeks, and (d) aged for 7 weeks.

Figure 6. Surface images of fluoropolymer (PFA) coating after thermal aging at 280 × (Ý1,000). (a) non-aged, (b) aged for 1 week, (c) aged for 3 weeks, and (d) aged for 7 weeks.

(a) (b)

(c) (d)

(a) (b)

(c) (d)

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R®  – rV šê¾š Û‡Þ JBR6 Þ:.

4. û«

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Figure 7. Scratch test results of fluoropolymer (PFA) coating, (a) non- aged coating, (b) aged coating at 280 × / 7 weeks.

# 3# 433# 533# 633# 733#

Time (sec) (a)

Friction coefficient

518#

513#

418#

413#

318#

313#

Fz (g) 3#

83#

433#

483#

533#

Friction coefficient

518#

513#

418#

413#

318#

313#

Fz (g) 3#

83#

433#

483#

# 3# 433# 533# 633# 733#533#

Time (sec) (b)

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