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 produce 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.

Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "OKLAHOMA PUBLISHING CO.., EMPLOYEES'..."

Photograph used for a story in the Oklahoma Times newspaper. Caption: "Mrs. Frank Thompson, Stuart Carey, Cathy Heggy and Bill Shdeed, left to right, enjoy the warm Oklahoma afternoon at Sunday's cocktail buffet given by Mr. and Mrs. Michael Elder and Mr. and Mrs. Harrison Levy Jr."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Joe and Mary Ann Harroz, left, and Arden and Paul Barrett at Heritage Place."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Joe Gutierrez, center, and Trent Carthel, right, both 12-year-old students at Houchin Elementary School, join two other children gathered around a blackboard bearing a chalk-scrawled message supporting the six besieged Moore school administrator."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Anticipating each page in the new Putnam City High School yearbook are Renee Hodson, left, assistant editor."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Pat Hogan, 917 East Hills Drive, Moore, charts his course for the Great American Race for antique motor vehicles."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Grandson Jay Michael is a source of relaxation for the chief of police while off duty."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Phillips Bill Bunch (23) makes it to first safely as the throw to Southeastern's Tim Phelps arrived late.."

Photograph used for a story in the Oklahoma Times newspaper. Caption: "Concerned parents representative Mike Bohrofen gives board a 2,100-signature in support of Moore six elementary school administrators during Monday night meeting."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "In western duds for a Swing for Sight party are, from left, Jim and Cathy Kirk, Barbie and Jim Vervack and Mary Hart."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Drafting guest for the Salvation Army Women's Auxiliary Mrs. Maj. David Jones, left, Mrs. William J. Legg, center, and Mrs. Les A. Voss address invitations to the auxiliary's registration tea and guest day scheduled at 11 a.m. Monday in Mrs. Legg's home."

B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

Semi-weekly newspaper from Bastrop, Texas that includes local, state, and national news along with extensive advertising.