Effect of vinyl and phenyl contents of silicone gum on the properties of the elastomers and cellular silicone cushions

Technical Report · Mon Dec 01 23:00:00 EST 1980

DOI:https://doi.org/10.2172/6830698· OSTI ID:6830698

Cady, W E; Jessup, E S; Buckner, A T

Two series of random terpolymers of dimethyl-diphenyl-methylvinylsiloxane were synthesized. In one series, the amount of methylvinylsiloxane was varied from 0 to 5 wt % and diphenylsiloxane was maintained at a nominal 12 wt %. In the other series, diphenylsiloxane was varied from 0 to 18 wt % and methylvinylsiloxane was maintained at a nominal 1 wt %. Molecular weights were maintained around 500,000. These gums were filled with about 26 wt % silicon dioxide and then converted to the intermediate elastomers, temporarily filled molding compounds, and cellular silicone cushions. The intermediate elastomers and cellular silicones were cured with a vinyl specific catalyst and tested. Increasing vinyl content increases the stiffness of the cushion but decreases its resiliency. Compression set reaches a minimum of about 5% at a methylvinylsiloxane content of about 0.9 wt %. Phenyl content has only a slight effect on cushion properties. Compression set is a minimum in a range of 7 to 14 wt % diphenylsiloxane.

• Research Organization: California Univ., Livermore (USA). Lawrence Livermore National Lab.
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6830698
• Report Number(s): UCRL-53105
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360401* -- Polymers & Plastics-- Preparation & Fabrication-- (-1987)
360403 -- Materials-- Polymers & Plastics-- Mechanical Properties-- (-1987)
CHEMICAL PREPARATION
COMPRESSION
CORRELATIONS
CURING
DENSITY
ELASTOMERS
GUMS
HARDNESS
MATERIALS
MECHANICAL PROPERTIES
MECHANICAL STRUCTURES
MOLECULAR WEIGHT
PHYSICAL PROPERTIES
POLYMERS
POROUS MATERIALS
SILICONES
SILOXANES
SUPPORTS
SWELLING
SYNTHESIS
TENSILE PROPERTIES