skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Replacement of silicone polymer A with silicone polymer B and the subsequent characterization of the new cellular silicone materials

Abstract

The purpose of this project is to replace silicone polymer A with silicone polymer B produced by Vendor B. Silicone polymer B and the resulting B-50 cellular silicone have been used to produce cushions for the W87 program. Approximately 5.5 years of stress relaxation aging study data as well as actual part surveillance data have been collected, characterizing the stockpile life performance of the B-50 cellular silicone cushion material. Process characterization of new cellular silicone materials as a result of replacing silicone polymer A with silicone polymer B has been completed. Load deflection requirements for the new cellular silicone materials based on silicone polymer B have been met. The silicone polymer B based cellular silicone materials must be compounded at densities of approximately 0.03 g/cm{sup 3} less than the silicone polymer A based cellular silicone materials in order to achieve the same load deflection requirements has also been demonstrated. The change in silicone polymers from A to B involved a decrease in volatile content as well as a decrease in part shrinkage.

Authors:
Publication Date:
Research Org.:
Allied-Signal Aerospace Co., Kansas City, MO (United States). Kansas City Div.
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10143117
Report Number(s):
KCP-613-5266
ON: DE94010105; TRN: AHC29409%%26
DOE Contract Number:
AC04-76DP00613
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Apr 1994
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE; SILICONES; MATERIALS TESTING; NUCLEAR WEAPONS; PACKAGING; MATERIAL SUBSTITUTION; MECHANICAL PROPERTIES; PHYSICAL PROPERTIES; EXPERIMENTAL DATA; 360603; 360606; 450200; NUCLEAR EXPLOSIONS AND EXPLOSIVES

Citation Formats

Schneider, J.W.. Replacement of silicone polymer A with silicone polymer B and the subsequent characterization of the new cellular silicone materials. United States: N. p., 1994. Web. doi:10.2172/10143117.
Copy to clipboard
Schneider, J.W.. Replacement of silicone polymer A with silicone polymer B and the subsequent characterization of the new cellular silicone materials. United States. doi:10.2172/10143117.
Copy to clipboard
Schneider, J.W.. Fri . "Replacement of silicone polymer A with silicone polymer B and the subsequent characterization of the new cellular silicone materials". United States. doi:10.2172/10143117. https://www.osti.gov/servlets/purl/10143117.
Copy to clipboard
@article{osti_10143117,
title = {Replacement of silicone polymer A with silicone polymer B and the subsequent characterization of the new cellular silicone materials},
author = {Schneider, J.W.},
abstractNote = {The purpose of this project is to replace silicone polymer A with silicone polymer B produced by Vendor B. Silicone polymer B and the resulting B-50 cellular silicone have been used to produce cushions for the W87 program. Approximately 5.5 years of stress relaxation aging study data as well as actual part surveillance data have been collected, characterizing the stockpile life performance of the B-50 cellular silicone cushion material. Process characterization of new cellular silicone materials as a result of replacing silicone polymer A with silicone polymer B has been completed. Load deflection requirements for the new cellular silicone materials based on silicone polymer B have been met. The silicone polymer B based cellular silicone materials must be compounded at densities of approximately 0.03 g/cm{sup 3} less than the silicone polymer A based cellular silicone materials in order to achieve the same load deflection requirements has also been demonstrated. The change in silicone polymers from A to B involved a decrease in volatile content as well as a decrease in part shrinkage.},
doi = {10.2172/10143117},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Apr 01 00:00:00 EST 1994},
month = {Fri Apr 01 00:00:00 EST 1994}
}
Copy to clipboard
Technical Report:
View Technical Report (3.25 MB)
DOI:  10.2172/10143117
Save / Share:
Export Metadata
Save to My Library
You must Sign In or Create an Account in order to save documents to your library.

  • ; ;
    The Lawrence Livermore National Laboratory (LLNL) has an active interest in the synthesis of new polysiloxanes as base polymers for cellular silicone materials. These elastomers have properties uniquely suited to very specific engineering requirements. While the polymers which we have prepared via random equilibrium of various cyclic tetrasiloxanes have adequate properties for certain applications, there is evidence to suggest that alternating block polysiloxanes prepared via condensation-polymerization techniques have properties more suited to our end uses as flexible foam materials (cushions). The synthetic sequence developed to prepare these materials involves reactions of functionally terminated (silylamino and silanol) polysiloxane oligomers to producemore » alternating multiblock (ABAB...) materials of high molecular weight. Dialkylamines are condensation byproducts in this reaction. The analysis and characterization of these multiblock polymers is reported.« less

  • The effects of mixing time and batch size on cellular silicone B-3333 were evaluated with a full factorial experiment. Mixing time had no influence on standard compression set, relative linear shrinkage, apparent density, load ratio, and batch dump temperature, but it did affect load deflection slightly. Batch size was shown to affect all properties significantly; in particular, large batch sizes produced high levels of compression set, apparent density, and load deflection. The optimum laboratory mixing conditions were a batch weight of 750 g and a mix time of between 4 and 10 min.

  • LLNL, and Pantex have thoroughly analyzed and characterized (1) the discontinued DC93 series of silicone potting compounds, (2) the commercial materials used to develop alternate compounds, and (3) representative alternate silicone potting compounds which we have developed. We evaluated the individual components, the activated blends of components and cured compounds. We measured physical and chemical properties, determined elemental compositions, measured trace impurities, and measured molecular weight by high-performance size-exclusion chromatography. We applied the techniques of thermal gravimetric analysis, thermal mechanical analysis, differential scanning calorimetry, and Rheometrics mechanical spectrometer analysis to characterize all of these materials. We evaluated the effect ofmore » shelf aging of the commercial starting materials and of the alternate components on the properties of the components and the activated and cured compounds. Results are collected in this report. 105 tables, 31 figures.« less