Phenyl Presentation

1
86 Summit Avenue Summit, NJ 07901
USA www.andisil.com
Anderson Associates, LLC
The Effect of the Diphenyl Siloxy Group on the
Characteristics of Silicone Polymers
Matthew J. Napoli Vice President, Research
Technology
2
Figure 1
dimethyl diphenyl polysiloxane type
3
Figure 2
cyclic silicone monomers with 1,3 divinyl
tetramethyl disiloxane by means of an
equilibration reaction
These materials can also be made from diphenyl
fluids and vinyl-terminated silicone polymers
4
Figure 3
The correlation between the phenyl content and
refractive index is directly proportional 15 /
16 phenyl content brings the Refractive Index up
to that of amorphous silica
5
Refractive Indices

• The diphenyl siloxy group
• Enables raising the refractive indices equal to
  that of the filler, such as quartz or silica.
• Provides a means of producing an optically clear,
  filled formulation with a cured silicone polymer.
• With dimethyl diphenyl polysiloxane co-polymer
  containing about 15 to 16 mole percent diphenyl,
  and when formulated with amorphous silica, will
  produce excellent clarity.
• With increased amounts, can achieve Refractive
  Indices matching that of optical fibers and
  amorphous silica.
• Provides formulators to produce transparent
  materials with RTV (Room-Temperature
  Vulcanization) systems.

6
Thermal Properties
Thermal properties of silicone polymers with
diphenyl siloxy groups are dramatically enhanced
by increased quantities of the diphenyl group
The phenyl group within the polymer chain
protects it by steric hinderance lower
susceptibility of the phenyl group High
viscosity dimethyl polysiloxanes have better
thermal stability. 5050 ratio of dimethyl to
diphenyl, gel times increase to 700 hours at
230? C. The weight or mole ratio of dimethyl
to diphenyl, will vary the service temperature,
from -55? C to 290? C for the various diphenyl
polymers.
7
Low Temperature Properties
Mole percentage of 3.0 to 3.5 diphenyl within
the silicone polymer, the Pour Point of this
material is below -80? C. Diluting or
plasticizing the RTV formulation with standard
dimethyl polysiloxane fluids will raise the Pour
Point. The use of diphenyl fluids as a diluent
will retain the low temperature characteristics
of the formulation.
8
Pour Points Table 1
COPOLYMER PRODUCT
PERCENTAGE POUR POINT / ?C Diphenyl dimethyl 4
6 - 73? C Diphenyl dimethyl 18 22 - 40?
C Methylphenyl dimethyl 50 - 51?C Dimethyl
polysiloxane 0 - 45?/-60? C Diethyl
polysiloxane 100 - 80? C
9
Flammability
Residual amounts of volatiles in the dimethyl
diphenyl copolymer produced during the
equilibration reaction affect the flammability of
the material. Residual volatility of less than
0.5 by weight, remaining in the polymer(s) when
measured on a 2.0 gram sample that has been
heated for 2.0 hours at 150? C, will pass the UL
94V-0 Test Procedure for flammability. Residual
volatility greater than 1.0 to 2.0, will not
pass the Test Protocol / Method.
10
Silicone Phenyl Materials

• Materials of design production that resist
• TIME
• COLD
• HEAT
• MOISTURE
• WEATHERING
• OXIDATION
• ELECTRICITY
• CHEMICAL ATTACK

11
86 Summit Avenue Summit, NJ 07901
USA www.andisil.com
Anderson Associates, LLC
The Effect of the Diphenyl Siloxy Group on the
Characteristics of Silicone Polymers By Matthew
J. Napoli, Vice President, Research
Technology, Anderson Associates, LLC To
download this presentation, please visit our
website www.andisil.com Thank you!