Instructions for use

Title Friction of zwitterionic hydrogel by dynamic polymer adsorption

Author(s) Ahmed, Jamil; Yamamoto, Tetsurou; Guo, Honglei; Kurokawa, Takayuki; Nonoyama, Takayuki; Nakajima, Tasuku;Gong, Jian Ping

Citation Macromolecules, 48(15): 5394-5401

Issue Date 2015-08-11

Doc URL http://hdl.handle.net/2115/62481

RightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in Macromolecules,copyright © American Chemical Society after peer review and technical editing by the publisher. To access the finaledited and published work see http://pubs.acs.org/doi/abs/10.1021/acs.macromol.5b00602.

Type article (author version)

Additional Information There are other files related to this item in HUSCAP. Check the above URL.

File Information Supporting Information.pdf

Hokkaido University Collection of Scholarly and Academic Papers : HUSCAP

1

Supporting  Information  

 

Friction  of  zwitterionic  hydrogel  by  dynamic  polymer  adsorption  

Jamil  AHMED,  Tetsurou  YAMAMOTO,  Honglei  GUO,  Takayuki  KUROKAWA,  Takayuki  NONOYAMA,  Tasuku  NAKAJIMA,  Jian  Ping  GONG  

                                     Figure   S1.   Frictional   stress  σ  vs.   sliding   velocity   v   for   PCDME  hydrogel   sliding   over  

glass  substrates  with  varied  wettability.  Contact  angles  of  glass  substrates  to  water  θw  

are  shown  in  figure.  Hydrogel:  PCDME  (S-­‐16.0).  Substrates:  G1  and  G3  series,  Normal  

pressure:  2.75  kPa.    

 

 

 

 

 

 

 

 

 

 

0

1

2

3

4

5

0 1 2 3 4 5 6

15.138.856.398.1106.6

Fric

tiona

l stre

ss, σ

(kP

a)

Sliding velocity, v x 1000 (m/s)

θw(o)

2

 

 

 

 

 

 

 

 

 

Figure   S2.   Dependence   of   frictional   behavior   of   PCDME   hydrogel   on   the   ionic  

strength  of  the  medium.  (a)  Overall  frictional  stress  σ  vs.  sliding  velocity  v,  (b)  Ratio  

of   elastic   component   of   frictional   stress   σel   to   shear   modulus   G   vs.   Weissenberg  

number  We=(v/ξ)τf,   (c)  Adsorption  time  τb  vs.  Weissenberg  number.  The  adsorption  

time   τb   was   estimated   from   the   results   of   Figure   S2a   using   Equation   (15).  

Concentrations  of  NaCl  are  shown   in   figure.  Hydrogel:  PCDME  with  swelling  degree  

q=20.1.   Substrates:   G2-­‐1,   Normal   pressure:   5.5   kPa.   Figure   S2a   is   cited   from  

reference  23.  

 

 

 

 

 

 

 

 

 

 

 

 

 

10-7

10-6

10-5

10-4

10-3

10-3 10-2 10-1 100

0.00.10.51.05.0

τ b (s)

(v/ξ)τf

CNaCl

(M)

10-1

100

10-2 10-1 100

0.00.10.51.05.0

σel /G

(v/ξ)τf

CNaCl

(M)

102

103

104

10-4 10-3 10-2

0.00.10.51.05.0Fr

ictio

nal s

tress

, σ (P

a)

Sliding velocity, v (m/s)

CNaCl

(M)

(a)   (b)   (c)  

3

 

 

 

 

 

 

 

Figure   S3.   Dependence   of   frictional   behavior   of   PCDME   hydrogel   on   pH   of   the  

medium.   (a)   Overall   frictional   stress   σ   vs.   sliding   velocity   v,   (b)   Ratio   of   elastic  

component   of   frictional   stress   σel   to   shear   modulus   G   vs.   Weissenberg   number  

We=(v/ξ)τf,   (c)  Adsorption   time   τb  vs.  Weissenberg  number.   The   adsorption   time   τb  

was  estimated  from  the  results  of  Figure  S3a  using  Equation  (15).  pH  of  the  medium  

are  shown  in  figure.  Hydrogel:  PCDME  with  swelling  degree  q=20.1.  Substrates:  G2-­‐1,  

Normal  pressure:  5.5  kPa.  Figure  S3a  is  cited  from  reference  23.  

 

 

10-7

10-6

10-5

10-4

10-3

10-3 10-2 10-1 100

1.93.435.07

6.639.811.412.7

τ b (s)

(v/ξ)τf

pH

10-3

10-2

10-1

100

101

10-3 10-2 10-1

1.93.435.076.63

9.811.412.7

σel / G

(v/ξ)τf

pH

102

103

104

10-4 10-3 10-2

1.93.435.076.639.811.412.7Fr

ictio

nal s

tress

, σ (P

a)

Sliding velocity, v (m/s)

pH

(a)  

(b)   (c)