Accession Number : AD0683669

Title :   POLYMER CHEMISTRY OF BORON CLUSTER COMPOUNDS.

Descriptive Note : Technical rept.,

Corporate Author : OLIN MATHIESON CHEMICAL CORP NEW HAVEN CONN CHEMICALS GROUP

Personal Author(s) : Schroeder,Hansjuergen A.

Report Date : MAR 1969

Pagination or Media Count : 39

Abstract : To achieve the goals of a research effort aimed at the synthesis of basically inorganic polymers with superior heat and oxidation resistance, a chain polymer approach was pursued. Large three-dimensional boron cluster compounds were linked via strong bonds resulting in three classes of polymers distinguished by high thermal stability. The first of these are thermosetting resins in which decaborane nuclei are joined through P-O-P or P-N=P linkages. They will crosslink between 500 and 650F and the resulting network polymers can serve as binders in asbestos-reinforced plastic structures. Their retention of physical properties after heat-aging at 800 to 900F for extended periods (e.g. 1000 hours) in air is outstanding. The icosahedral carboranes, especially the meta and para isomers, are ideally suited for the synthesis of flexible and thermoplastic-like species. Progress has especially been achieved in the development of the silicone related m-carboranesiloxanes (DEXSIL polymers) in which m-carborane moieties are linked via siloxy groups. Their use as high-temperature elastomers and coatings is now being pursued for various industrial applications between 600 and 900F. Joining m- and particularly p-carborane moieties by single-atom bridges such as sulfur or tin affords long-chain polymers with exceptionally high softening points. (Author)

Descriptors :   (*INORGANIC POLYMERS, *BORANES), (*HEAT RESISTANT PLASTICS, INORGANIC POLYMERS), (*SILOXANES, POLYMERS), PHOSPHORUS COMPOUNDS, MOLECULAR ISOMERISM, TIN COMPOUNDS, AGING(MATERIALS), ELASTOMERS, COMPOSITE MATERIALS

Subject Categories : Polymer Chemistry
      Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE