Preparation of Polystyrene Particles Containing Poly(ethylene glycol) Groups and Their Surface Charge Characterization in Dielectric Medium

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Polymer (Korea), Vol. 28, No. 6, pp 524-530 (2004) /


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Preparation of Polystyrene Particles Containing Poly(ethylene glycol) Groups and Their Surface Charge Characterization in Dielectric Medium

Seong Hun Kim, Bae Joong Kim, Dae Ik Kwon, and Ki Hong Park*^% Department of Molecular System Engineering, Hanyang University,

Seoul 133-791, Korea

*Optoelectronics Material Research Center, Korea Institute of Science and Technology, P.O.Box 131, Cheongryang, Seoul 136-791, Korea

†e-mail : khopark@kist.re.kr

(Received August 3, 2004;accepted November 4, 2004)

5¨¹ä0L, 4ì(8L @ìœ) ” ¬ôH´ø (PEG-MMA) y€ 4ì(8L @ìœ) T” ¬ôH´

ø (PEG-diMMA)¼ Qq $\ t`”\ (emulsifier-free) `” Q©˜, œ´ 8L @ìœp¼ V Ô 4ìä0L Åм ©q˜@ , ´œÀp ð ´°Xô Ä„ \°˜@$. ÄРĀ FT-IR Ä Qpœ ¬°¼ •¸˜@ , QðÀ Å Ä]p€ <ì DÐ D8ý (SEM)„ ´é˜, ÅÐ ¬p€ Äð

¼ °ì˜@$. ä0L @˜, 5( ô PEG-MMAÔ 2ð5 mol%, PEG-diMMAÔ 1 mol% Í À<

\ ¼œ ÅÐ ¬p¼ û„ X È$. ©q\ ÅИ œ´ D˜¼ `D $ ô\ ELS-8000 Qð ÀՄ ´é˜, \ ,œ„ aU˜@$. ä0L @˜, PEG-MMA 5 mol%\ 183 mV˜ „< Ҁ

\ ,œ´ aUX$.

,-897,.9¹Polystyrene particles (PS) with poly(ethylene glycol) units on surface were formed by an emulsifier-free emulsion polymerization using styrene, poly(ethylene glycol) methacrylate (PEG-MMA) or poly(ethylene glycol) dimethacrylate (PEG-diMMA) at pH 7, and followed by freeze-drying to give the corresponding powders. The structures of PS particles were confirmed by FT-IR spectroscopy, and the particle size and distribution the PS particle were observed by scanning electron microscopy and particle analyzer. Monodisperse polymer particles were obtained at a concentration of PEG-MMA 2ð5 mol% or PEG-diMMA 1 mol% relative to styrene. The highest zeta potential of polymer surface was measured to be 183 mV at a polymer of PEG-MMA 5 mol%, which was measured in dielectric medium by means of ELS- 8000 dynamic light scattering.

Keywords¹emulsifier-free emulsion polymerization, poly(ethylene glycol) methacrylate, poly(ethylene glycol) dimethacrylate, polystyrene powders, zeta potential.

Polymer (Korea), Vol. 28, No. 6, 2004_ Polystyrene Particles Containing PEG Groups _{ }

žVâ, \28Ì \6x, 2004„ 4ì(8L @ìœ)p¼ VÔ 4ìä0L ÅÐ# #

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”\ ´ ¼ä@ ˆU˜Ì ´ì  X ÈÔ Ã€ \

\˜ dØ´ø ´h´Ø ´hq 5( ô˜ Œ´h y€

Ñ´h´ ¼ä œ´\ ÅÐD X\e„ `\˜p Œ x´$.⁸H¼ $ô ÅÐ œ´ Œ´h D˜¼ À,˜p D

˜, ” ¬ôð (MA)< Y€ ´hq 5( ô¼ Œ¼ ì $\ Q©˜,¼ ˜ , y€ Ñ´h D˜¼ À ,˜p D´\ N, N’-T”8„8¸8 ” ¬ôH´ø (DMAM)€ Y€ ´hq 5( ô¼ ðq $\ Q©

˜,¼ ˆUœ œœ´ Åм ©q  X È$.⁹ t`

”\ Q©p¬Ô \\€ 5( ôœÀp Uq\ Dì

¼T¼ lì x@ Q©µ„ Uq˜ , ÅМ´„ ˆ U”˜´\, ( ô˜ Ìè€ ¨ \\È qå´Ø@Ô Q©p¬œ ´]X , ´ Œx „A ¼œ ÅÐ@ U qXÔ Ã|œ Œdx È$.^10,11 É `”\¼
Q lŘ

Ô Š˜ , \\Ø 5( ô˜ ´hq |´ ´

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Q©\ H¼ $ô 4ì(„ Œ”l) ŠИ œ´ ” ¬ô𘠌´h„ Ř, $ ˜ X Ą ¡X˜Ô ˜´œd Åм \°œ 4  È$.¹²

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Àìé

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\ ©q˜Ô €

0¬@ È , ´° ‘´ ¼ôØp ½p Œx ´

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„$. 2œ Xé $\ ÄÐ ÅИ œ´ D˜

@œ 0¬Ô   `D $ ô\ ÄÐ ÅИ œ

´ D˜ @œ 0¬Ô  Š˜$. ùÈ Dp A T äLH´ (DÐ Å´)é ÅÐÔ `D $ô\ Då

˜˜, ´˜,¼ ˜p Œx, ‘5 ͼ  ´Ì ˜ p D´\Ô œ´ D˜@ ° ÅÐ@ „Ô˜Ì \$.²¹ ŠИ œ´ D˜Ô \ ,œ´¼ ˜Ô R|œ œD X°, \ ,œ´ ° ÅÐ@ ÅÐD˜ Uœ X\e|

œ ¸˜, $ô\ ˆUœ Ä𡄠Uq  X È$.

8 0¬Ô `D $ô\ \ ,œ´ ° ÄÐ Åм ûÔ Ã„ éA|œ ˜ , ´hq 5( ô¼ ì é˜ Š , „´hq 5( ô¼ ìé˜, ˆUœ 4ì ä0L Åм ©q˜ Ð ˜@$. „´hq 5( ô¼ ìé˜p Œx pH 7˜ Qq $\ Q©  X ÈÔ

åP´ È$. ìéœ 5( ôÔ 8L @ìœp¼ ¨`

˜Ô 4ì(8L @ìœ) ” ¬ôH´ø (PEG-MMA)€

4ì(8L @ìœ) T” ¬ôH´ø (PEG-diMMA)¼ 5( ôœ ìé˜@$. ùÈ PEG-diMMAÔ ´@åq

„ @ Èô\ @\ -     X Èp Œx

, @\ 4ìä0L Åм \°  X Ȅ Ã|œ

p@˜@$. ©qœ Åм Ä”œ  FT-IRœ ¬° Ä ]˜@ A °q p¸ ÅÐ œ´˜ U¼ <ì DÐ D8ý|œ °ì˜@$. `D $ ô\ PEGp˜ Ý

@ p¸ œ´ D˜˜ ”¼ Œ„4p D´ ELS-8000„

´é˜, ÅИ \ ,œ< ´¼ aU˜@$.

51#=U##

;ú1 è $\ ´h ˜\ 3h ݘX¼ ìé˜

@$. ( ô¸ ä0L (Aldrich, 99%)€ 5% NaOH Xé

¡|œ 1Ì xÙ  P• ݘ˜, Q© H \€ È\

|„ \°˜@$. 8 V˜ ½, 4ì(8L @ìœ) ”

¬ôH´ø (PEG-MMA) (Mn 475), 4ì(8L @ìœ) T” ¬ôH´ø (PEG-diMMA) (Mn 550), T„ä`

(DVB), , Ø ¼dØ´ø (KPS) (99%), 37% <ð Xé

¡ (HCl), Xð” Øø¨ (NaOH) (99%)€ Aldrich˜ ½

„ ˜ U\ <U ´ ìé˜@$.

Žæ#+SP;),1 -™ Xp, ˜˜ Ap, Ì Å

@„ Àiœ 500 mL 3¬ L¼ä¬¼ ­h° d˜œ $

Œ, ´h ˜ ݘX 500 mL¼ c$. |@ 5( ô PEG-MMA¼ L¼ä¬ c Q© h (70 )œ °U Xp¼ p$ì° Ì ÄDp˜\ X Í 250
1 rpm|œ 20ÄD X˜@$. 70  ´´´ ä0L 20 g (0.174 mol)„ c 5ÄD Xœ  \\ 0.7 g„ è@

˜@ 6D ˆ Q©˜@$. PEG-MMA˜ Í p

¸ Aå„ Œ„4p D˜, ä0L< ¨ PEG-MMA 1.65 g (3.48 mmol), 2.48 g (5.22 mmol), 3.30 g (6.96 mmol), 4.13 g (8.70 mmol)„ AA˜ $$ è@˜, AA PM-1, PM- 2, PM-3, PM-4¼ \°˜@$ (Table 1).

Žæ#+SGP#;),1 PM ìȘ Q©< Y€ iÕ

|œ Q©˜@$. PEG-diMMA˜ Í p¸ Aå„ Œ„

4p D˜, ä0L< ¨ PEG-MMA 0.48 g (0.87 mmol), 0.96 g (1.74 mmol), 1.91 g (3.48 mmol), 3.83 g (6.96 mmol)„ AA˜ $$ è@˜, AA PDM-1, PDM-2, PDM-3, PDM-4¼ \°˜@$ (Table 2).

æ®Ù# Õ#’™1 Q©  ûô œœ´ ÅÐÔ ,<˜, 8 ˜ ‘|„ \° ˜@$. 8X‘ ( ô, lì x 1„ \°˜p D˜, Q©  û€ œœ´

`”¡„ l]@ (Membrane Filtration Productsì, Cellu Sep

  Kim et al. Polymer (Korea), Vol. 28, No. 6, 2004/

  €q# 1# žVâ, \28Ì \6x, 2004„/

T4, Mw cut-off 12000ð14000)„ ìé˜, l]p$. ´ h˜Ý˜X¼ $¼ 2Ì H„<´\ Xp (Vision <

™, K.M.C-8480 SFN)¼ ìé˜, 40 \ 7¼D X˜

@$.

MÕ#™í1#U\\ 4ìä0L œœ´ 顀 50 mL , Äìé 4ìDœ„L @ cô HŒLp (Cole- Parmerì, 8853)¼ ìé˜, 2D ˆ Øì  'Tœ ¡ ô ̜ ðœ , ð ´°p (¼ Lab ì, FD 5505S)

¼ ìé˜, 7¼D ´°˜@$.

­­#
š1 Q©|˜ ¬° •¸„ D˜, AA˜ Ä Ð Ä„ Perkin Elmerì˜ spectrum GX FT-IR ÄQp

€ SENS IR technology ì˜ ATR ¡x\ì¼ ´é˜, Ä ]˜@$. ÄРĘ `ì D´ h (Tg)¼ aU˜p D˜, h <ì 4 p (DSC) (Dupontì, DSC 2010)¼ ìé˜@$. Ę ÅÐ Äð
€ ÅÐ ¬p¼ aU

˜p D˜, <ì DÐ D8ý (SEM) (HITACHI ì, S- 2500C)|œ @p˜@$. 2œ `D $ ˆ\˜ Å

Ä]€ Beckman Coulterì˜ LS230„ ìé˜@ , œ´

D˜Ô Otsukaì˜ ELS-8000„ ìé˜, aU˜@$.

61#-y#Œ#Ý##

SHJ0PPD#)Õ#~"1 8 0¬\ PEG-MMA¼

`œ ´`Ô, „´hq `”\˜ |q„ @ p Œx

Qq $\ Q©´ @å˜ , 2œ ( ô˜ - „

˜p Œx ä0L< 5Q©´ ÉX´\, ÅМ´

 PEGp@ ” ´ Ä,äp D¨´$. 8 $

\Ô PEG¼ ¨`˜Ô lì x ( ô Q, ¼@å 5(

ô PEG-MMA€ ´@å 5( ô PEG-diMMA¼ `

˜, ä0L<˜ œA 5Q© °´„ °ì˜@$. ð` ä 0L˜ р U˜ PEG-MMA˜ ф Ý@ä´\

ÅИ ”¼ @p˜@$. PM-1, PM-2, PM-3, PM-4 è

 Q©  l], HŒL Øì, ð ´°˜ \\œ Ä

”˜@$. Table 1 8 ð<¼ Uì˜@ , Ä$˜ SEM ì„ Figure 1 Ø ô$. SEM ì\ 4Ô T€

Y´ PEG-MMA˜ Í@ ä0L @˜, 2ð5 mol%

\Ô ÅÐ ¬p 300ð310 nm¼ @ Ô $𠼜 ÅÐ

¼ û„ X È$. ùÈ PEG- MMA˜ Í 2 mol%˜ °

´\Ô „< ¼œ ÅÐ$´ @ ý´ ðUØ<

‘˜, QðÀ D
 ˜˜, \XÔ ½D˜ 4ϛ

„ @p  X È$. PEG-MMA˜ Í p¼ ÅÐ ¬ p˜ ° ”Ô  , ÅÐ ¬p@ $Ì P̘´\

¼ ½D P̘@|Ø D@œ Aå€ < Š˜$.

Q©€ ° ‘|´ ´ ÉX|°, 8L @ìœ

p˜ 9q< t ìì˜ Åô 堜 ¸´\ ÅÐD˜ X

\e´ éÄÈ ÑéȌ„ •¸  X È$. Figure 2Ô ä0L< PEG-MMA¼ 5Q© ˜, û€ Ę FT-IR ÄQ äÙø<„ Ø ô$. 4ìä0L˜ ¡Q |¬

(iå± C¼C, 1500 cm^-1 À<)¸ PEG-MMA ˜œ |

¬Ô 1727 cm^-1À<\ C¼O |¬€ 1111 cm^-1À<\

C-O-C stretching  ˜œ ¡Q |¬¼ •¸˜@$.

PEG-MMA Í@ Ý@ X C¼O |¬€ C-O-C |¬

˜ ¬p Ý@¨„ •¸  X È , ´Ã|œ PEG- MMA¼ lŜ Ñ @˜, °˜ „€A|œ PEG-MMA qĄ ¨`˜ Ȍ„ Œ X È$.

SHJ0glPPD#)Õ#~"1 ´@åq PEG-diMMAÔ PEGp ˜œ ÅИ ˆUq å
< ä0L<˜ @¼ õ˜,, @\ ÄÐ Åм ©q˜ Ð ˜Ô éA|

œ °ìX$. ð` ä0L˜ р U˜ PEG-diMMA

˜ ф Ý@ä´\ ÅИ ”¼ @p˜@$. PDM-1, PDM-2, PDM-3, PDM-4 è Q©  l], HŒL Øì,

ð ´°˜ \\œ Ä”˜@$. Table 2 8 ð<¼ Uì˜@ , Ä$˜ SEM ì„ Figure 3 Ø ô

$. SEM ì\ 4Ô T€ Y´ ä0L @˜, PEG- diMMA 0.5 mol%\Ô Í@ Ht î„ ˆUœ ÄÐ ÅÐ@ UqX ûÈ , 1 mol%\Àp ÅÐ ¬p 410 nm¼ @ Ô $𠼜 Åм û„ X È$. 8ì 2 mol% ´
Àp dÈd ÅÐ ¬p˜ ¼Ô P̘

@|° ÅÐ UÔ È ¼˜ ÅÐ œ´€ ° ôŒ$.

PEG-diMMA˜ Í@ ҄ ´, ÅÐô˜ @ X‘¸

7DEOH 3RO\PHUL]DWLRQ8VLQJ3(*00$0Q^a S a m p le

C o d e s

S ty re n e (m o l)

P E G -M M A

(m o l% )^b p H D (n m )^c

S .D . (n m )^d P M -1 0 .1 7 4 2 7 3 1 0 6 2 P M -2 0 .1 7 4 3 7 3 0 7 6 1 P M -3 0 .1 7 4 4 7 3 0 6 6 3 P M -4 0 .1 7 4 5 7 3 0 0 7 5

a Polymerization condition: KPS 0.7 g, water 200 g, 6 hours, 250 rpm, 70'1 . ^b mol% relative to styrene. ^c Number-averagediameter of PS powders. ^d Standard deviation.

7DEOH3RO\PHUL]DWLRQ8VLQJ3(*GL00$^a S am ple

C odes

S tyrene (m ol)

P E G -diM M A

(m ol% )^b pH D (nm )^c

S .D . (nm )^d

P D M -1 0.174 0.5 7 - -

P D M -2 0.174 1 7 410 52

P D M -3 0.174 2 7 400 102

P D M -4 0.174 4 7 - -

aPolymerization condition: KPS 0.7 g, water 200 g, 6 hours, 250 rpm, 70'1 . ^bmol% relative to styrene. ^cNumber-average diameter of PS powders. ^dStandard deviation.

Polymer (Korea), Vol. 28, No. 6, 2004_ Polystyrene Particles Containing PEG Groups _{ }

žVâ, \28Ì \6x, 2004„ 4ì(8L @ìœ)p¼ VÔ 4ìä0L ÅÐ# #

ÅÐD (qåµ)˜ @ X‘ ¼ôà X Èp Œx ŠИ ¼@ @˜\ Ã|œ ´]\$. 2œ PEG-diMMA Í Ý@ p¼ ÅÐ ¬pÔ ½ 410\ 400 nm ´˜

œ $Ì P̘@$. ´@åq PEG-diMMA˜ Q©Ô

¼@åq PEG-MMA „˜,
@A|œ A€ ðX@

è@Xp Œx „A ÅÐ ¬p@ ¬ , ¼Ô î€ ð<¼ Ø ô$ Aœ$. ÅИ (Äð

¼ VÔ ˆUœ ÄÐ Åм ©q˜p Dœ PEG- diMMA˜ AHœ ÍÔ ä0L @˜, 1 mol% U

@ AH¨„ Œ X È , 8 AU ÍÔ PEG- MMA „˜, „< Á€ A-´$. Figure 4Ô pH 7

\ ä0L< PEG-diMMA¼ 5Q©˜, û€ Ę

FT-IR ÄQ äÙø<„ Ø ô$. PEG-MMA¼ ìé

œ Figure 2˜ äÙø<˜ ¡Q |¬Ô ° h´@ 

, PEG-MMA€ l@ œ PEG-diMMA Í@ Ý@

 X C¼O |¬ (1727 cm^-1)€ C-O-C |¬ (1111 cm^-1)

/ / / / / / / / / /

(a) PM-1 (b) PM-2



/ / / / / / / /

(c) PM-3 (d) PM-4

)LJXUH Scanning electron micrographs of poly(styrene-co-PEG-MMA); mol% relative to styrene (a) PEG-MMA 2 mol% (PM-1), (b)  PEG-MMA 3 mol% (PM-2), (c) PEG-MMA 4 mol% (PM-3), and (d) PEG-MMA 5 mol% (PM-4)./

)LJXUH FT-IR spectra of poly(styrene-co-PEG-MMA); mol%

relative to styrene (a) PEG-MMA 0.5 mol%, (b) PEG-MMA 3 mol%, (c) PEG-MMA 4 mol%, and (d) PEG-MMA 5 mol%./

7333# 6833# 6333# 5833# 5333# 4833# 4333#

Wavenumber (cm^-1)

Transmittance (%)

  Kim et al. Polymer (Korea), Vol. 28, No. 6, 2004/

  €q# 1# žVâ, \28Ì \6x, 2004„/

˜ ¬p ¨ Ý@¨„ •¸  X È$.

]
#
MÕ#&ñ#6®y#)#ñ#¥)1 PEG-diMMA

Ô @\ -  ˜p Œx Q© , @@ Xô È Ô °ì˜@$. ÄÐ ÅИ @ U¼ Œ„4p D

˜, PDM ìÈ (ä0L/PEG-diMMA)¼ 1-”8-2-|¤

ìT¼ (NMP) ¹,\ ÅИ é´ ùq„ @p˜@$.

ä0L @˜, PEG-diMMA 0.5 mol% (PDM-1)€ NMP

 ½D é´X|°, PEG-diMMA 1 mol% (PDM-2) ´

Àp NMP °˜ ¹ ŠŒ„ •¸˜@$. 8,Ø Figure 5˜ h <ì 4Ä] ð<¼ 4´ ÄÐ Ä (PDM-2 ðPDM-4)˜ `ì D´ h@ 93ð99  ì´\ @p X$. PEG-diMMA˜ Í@ Ý@¨ p¼ @˜

Ý@ ˜˜, `ì D´ h@ @pX Š°Ø, y€

`ì D´ h@ Ý@˜ì¼ H
˜@ , `ì D´

h@ 99\ 93 œ dÈd PÌ˜Ô ýå„ Ø ô

$. ´,œ D
€ „A î€ Í˜ PEG-diMMA

˜˜, „A î€ @˜ 4ìä0L ÅÐ@ UqX

p Œx´ , 2œ PEG-diMMA˜ Ñ´ Ý@¨ p¼

`0œ 8L @ìœp˜ Ý@œ ¸˜, `ì D´ h

/ / / / / / 

(a) PDM-1 (b) PDM-2_



/ / / / / / 

(c) PDM-3 (d) PDM-4_

)LJXUH Scanning electron micrographs of poly(styrene-co-PEG-diMMA); mol% relative to styrene (a) PEG-diMMA 0.5 mol% (PDM- 1), (b) PEG-diMMA 1 mol% (PDM-2), (c) PEG-diMMA 2 mol% (PDM-3), and (d) PEG-diMMA 4 mol% (PDM-4)./

)LJXUH FT-IR spectra of poly(styrene-co-PEG-diMMA); mol%

relative to styrene (a) PEG-diMMA 0.5 mol%, (b) PEG-diMMA 1 mol%, (c) PEG-diMMA 2 mol%, and (d) PEG-diMMA 4 mol%./

#7333# 6833# 6333# 5833# 5333# 4833# 4333#

Wavenumber (cm^-1)

Transmittance (%)

Polymer (Korea), Vol. 28, No. 6, 2004_ Polystyrene Particles Containing PEG Groups _{ }

žVâ, \28Ì \6x, 2004„ 4ì(8L @ìœ)p¼ VÔ 4ìä0L ÅÐ# #

@ P̜ ð<œ ´]\$.

]
#
MÕ#Ùñ#Õ1 ÅÐ œ´˜ D˜Ô \ ,

œ„ aU˜, ÔU  X È$. „< 8xœ ф aU˜

p Œx aU iÕ, aU pp p¼ ½D˜ ùq˜ h

´@ Ȅ X È$. ¼XA|œ QðÀ„ ´éœ iÕ<

DÐ Œå„ ´éœ iÕ´ ÈÔ°, 8 $\Ô Qð ÀՄ ´é˜@$. ©q\ ÄÐ ÅÐ$˜ `D $ Q

\˜ \ ,œ„ aU˜p D´\ ð` halocarbon®

0.8 („Q 1.7)< isopar® G („Q 0.8)¼ 1:1.7˜ À|„œ

|©˜, ÅИ „Q (½ 1.13)< ¼˜˜Ô `D $„

\°˜@$. ´,œ `D $ ˆ\ 9Ì ˜ Åм c HŒLœ Ø Äðè , \ ,œ aUp (ELS- 8000)¼ ´é˜, ÅИ \ ,œ„ aU˜@ 8 ð<¼ Table 3 Ø ô$. œ´ D˜p@ °˜ Å X Š€ ¼X ÄÐ ÅÐÔ \ ,œ´ °˜ 30 mV

´˜œ Œdx È$. Table 3\ 4Ô T€ Y´, PEG- MMA˜ Í@ 1\ 5 mol%œ Ý@¨ p¼, \ ,

œ€ 104\ 183 mVœ ¬Ì å
˜@$. PEG- MMA 5 mol% ´
˜ Í\ Q©˜, 4˜|Ø, ÅИ ˆ Uq€ @˜˜@ , ´°  ÅÐD˜ ‘´ ¼ô Ø Äðq´ Ë Š€ Ä„ Uq˜@$. PEG ¨ ´

@å ° PEG-MMA 5 mol%\ @å Ҁ 183 mV, 8ì

2.2110^-5˜ ´@ aUX$. ´Ã€ 8L @ ìœp@ \ ,œ˜ Ý@ ¬Ì Aå„ @$Ô Ã„ ÅÝ˜Ô ð<´$. x œ Dp A TäLH´

ìéXÔ ÅИ \ ,œ€ 100 mVð
´ Ô¬X È , tp Åм ´éœ ýð@ 120ð130 mVœ Œdx Èp Œx, 8 0¬˜ 183 mV˜ R€ „< ðXœ | q„ $Dœ ô$. œø PEG-diMMA¼ ìé˜, ûô

 ÅÐÔ PEG-MMA „˜, „A î€ \ ,

œ„ Ø ô$. @å AU ͸ 1 mol%\ Q©œ

ÄÐ ÅÐ@ 91 mV˜ \ ,œ R„ Ø ô , 1.09210^-5˜ Dp A ´¼ Ø ô$. 8 ͘

D Í\ \ ,œ R€ IéÈ P̘@$.

PEG- diMMA˜ Í@ Ý@¨ Ȭ˜ \ ,œ

R´ P̜ À DÐ D8ý ì\ 4Ô T€ Y´

PEG- diMMA 2 mol% ´
\Àp ÅИ Äð
@

Ë Š˜p Œx|œ A\$. ÅИ \ ,œ„ Ý

@äp D´\Ô ´@åq 5( ô PEG-diMMA4$

¼@åq 5( ô PEG-MMA@ (l è<AĄ Œ X È$. PEG-diMMA˜ ¬°Ô Ñ( ÌXp¼ @ , @ô°Ô œXp¼ V Èp Œx, ´ œq\

- „ ˜p D´\Ô (D (loop)
´ Xô¼ ˜Ô P

Œx, PEG-diMMA˜ œ´ ˆU\˜ è<@ œ è<

A´$ Ôaœ$.

71#-Ý##

„´hq 5( ô (PEG-MMA y€ PEG-diMMA)¼ ì é˜, œ´ „´hq˜ 8L @ìœp¼ VÔ Ä Ð Åм t`” Q©Õ„ ìé˜, ©q˜@$. 5(

ô PEG-MMA˜ ÍÔ ä0L @˜, ½ 2ð5 mol%˜

S€ Í ÔD\ ¼˜ ˆUœ 4ìä0L Åм

©q  X È$. œø @q 5( ô PEG-diMMA¼ ìéœ Q©\Ô PEG-MMA Q©4$ $Ì Èˆ

Uœ œœ´@ UqX , ¼œ Åм ûp Dœ

AUœ ÍÔ ä0L @˜, ½ 1 mol% Ą Œ X È$. 4Ä]„ õ˜, °ì˜,8 T, PEG-diMMA˜

Í@ Ý@¨ p¼ ÄÐ ÅИ @Ô ´(ô  `0œ PEG˜ Aå|œ `ì D´ h@ dÈd P ̨„ Œ X È$. `D $ ô\ œ´ D˜¼ a U´8 ð<, PEG-MMA˜ 5 mol%\ „< Ҁ 183 mV

˜ \ ,œ<, 2.2110^-5˜ ´¼, 8ì PEG- diMMA˜ AU ͸ 1 mol%\ 91 mV˜ \ ,

œ R< 1.0910^-5˜ Dp A ´¼ @„ •¸˜

@$. ´Ã|œ `D $ô\ ÅИ \ ,œ„

Ý@äp D˜, 8L @ìœp@ „< è<AĄ

7DEOH  =HWD 3RWHQWLDO DQG (OHFWURSKRUHWLF 0RELOLW\ LQ

'LHOHFWULF)OXLG

S a m p le C o d e s Z e ta P o te n tia l (m V )

E le c tro p h o re tic M o b ility (c m²/V s)

P M -1 1 0 4 1 .2 4Ý10^-5 P M -2 1 1 9 1 .4 2Ý10^-5 P M -3 1 3 8 1 .6 7Ý10^-5 P M -4 1 8 3 2 .2 1Ý10^-5 P D M -1 4 2 0 .5 1Ý10^-5 P D M -2 9 1 1 .0 9Ý10^-5 P D M -3 5 8 0 .6 9Ý10^-5 P D M -4 5 6 0 .6 2Ý10^-5

)LJXUH  DSC thermograms of polymer powders at a heating rate of 10 ,/min (second heating): (a) PEG-diMMA 1 mol%, (b) PEG-diMMA 2 mol%, and (c) PEG-diMMA 4 mol%./

# ;3# 433# 453# 473#

Temperature (×)

Heat flow (mW) Endo Up

  Kim et al. Polymer (Korea), Vol. 28, No. 6, 2004/

  €q# 1# žVâ, \28Ì \6x, 2004„/

ÅÝ  X È$.

Uhihuhqfhv##

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