Put your banner here

 

Last update:

01/04/2004

 

 

 

 

 

Topology of Modified Inorganic Oxide Surfaces

Example of the impact of reaction conditions on the characteristics of a surface 
with tethered Poly(vinyl acetate) chains prepared by a two-step
graft polymerization process.

PVAc monomer concentration (c)

N (degree of polymerization)

Polymer Graft Yield (a) (mg/m2)

D (average chain spacing)

(C)

s (b) 

(surface
density)

M10 (10% v/v monomer)

220

0.80

62

4.743 x 10-3

M25 (25% v/v monomer)

340

1.86

51

7.130 x 10-3

M40 (40% v/v monomer)

460

3.54

43

9.907 x 10-3

(a) Polymer graft yield established on silica particles with silylation yields of approximately 3.0 mg/m2
(b) Surface density defined as s = (a2/D2), where a is the approximate size of a monomeric unit and D is the average spacing between chain anchors on the surface
(c) initial monomer concentration is indicated inside the parentheses.

Average Root Mean Square Roughness Values for Modified 
and Unmodified Membrane and Wafer Samples
 

RMS Surface Roughness (nm)

Modification Type

Membrane

Wafer

Unmodified

19.1 ± 1.3

0.21 ± 0.03

Vinyl silylated

15.3 ± 1.1

1.20 ± 0.15

PVAc Grafted (10% monomer)

18.9 ± 0.2

0.85 ± 0.09

PVAc Grafted (25% monomer)

12.6 ± 0.4

0.81 ± 0.03

PVAc Grafted (40% monomer)

13.9 ± 1.0

0.85 ± 0.11

 

 

 

 

 

 

 

 

 

Copyright © [Year] [Your company name]