Page 160 - Handbook of Adhesion Promoters

8.11 Polydimethylsiloxane 153

8.11 POLYDIMETHYLSILOXANE

The following commercial additives are designed to be used for adhesion promotion of
products containing silicone polymer: Chartwell C-545.1; Dynasylan 1146, 1122, 1124,
AMMO, and DAMO; and Silquest A-1120 & A-2120 and VX-225.
An increase in adhesion strength after oxygen or nitrogen plasma treatment was
attributed to the chemical interaction between functional groups introduced on the PDMS
1
surface and the functional groups on collagen as detected by FTIR. The high peel
strength observed on PDMS treated with argon plasma was attributed to its increased
1
roughness which increased mechanical interlocking.
2
Polydimethylsiloxane is frequently used in nanofabrication. The two standard tech-
niques are used for bonding of PDMS parts: surface activation by oxygen plasma and
cocuring of PDMS parts with different ratios of components A and B (typical ratio is
2
10:1). The bond surface of the PDMS part and a substrate are treated with a weak oxygen
2
plasma, or these surfaces are activated using a corona discharge device. The two surfaces
2
are then brought into contact to form (Si–O–Si) bonds. This technique is though limited
2
to silicon-based substrates such as glass, silicon, and PDMS. The adhesion promoter
2
(primer) GE SS4120 is recommended by General Electric Company. This primer consists
2
of 5-10 wt% ethyl silicate, 30-60 wt% methanol, and 30-60 wt% ethanol.
The optimal bonding conditions between PDMS and copper-clad printed circuit
boards can be attained when using a surface adhesion promoter and a surface treatment on
3
copper-clad board. The surface adhesion promoter was based on several components of
Wacker Chemie silicone system and the surface treatment included etching with solution
3
of Na S O .
2 2
8
Silicone composition exhibits excellent adherence to magnesium-based substrates
4
such as magnesium alloys and excellent resistance to organic solvents. These composi-
tions include polymerizable silicone component, amino-containing silane (e.g., amino-
ethyl-3-aminopropyl-methyl-dimethylsilane) adhesion promoter which enhances adhesion
4
of the composition to magnesium-based substrates.
The base coat of the antifouling composition consists of an epoxy modified adhesion
5
promoter and the hydroxyl terminated polymer capable of reacting with silane.
REFERENCES
1 Juárez-Moreno, JA; Brito-Argáez, LG; Ávila-Ortega, A, Oliva, AI; Avilés, F; Cauich-Rodríguez, JV,
Int. J. Adh. Adh., in press, 2017.
2 Kersey, L; Ebacher, V; Bazargan, V; Wang, R; Stoeber, B, Lab. Chip, 9, 1002-4, 2009.
3 Cai, D; Neyer, A; Sensors Actuators B: Chem., 160, 1, 777-83, 2011.
4 Decato, AA, WO2001036537, Loctite Corporation, May 25, 2001.
5 L i a o , W P , WO201412659, Momentive Performance Materials Inc., Aug. 21, 2014.