Polydimethylsilanes

Crystalline structure of poly(methyl-n-propylsilane)

“…20,21 Many crystalline polysilanes have also been reported to adopt a hexagonal columnar liquid crystalline mesophase Polysilanes are a novel class of polymers made of (HCLQ) above melting point. [22][23][24] Since the early a concatenation of silicon atoms, each bearing two 1980s, 6,25,26 it has been reported that the introducaliphatic or/and aromatic carbonaceous substitution of unsymmetrical side groups greatly reduces ents.…”

Soluble alkyl substituted polygermanes: Thermochromic behavior

“…Scheme I shows that both bromides and chlorides could be prepared from readily available diphenylgermanium dichloride. 2 Scheme 1I 29,30 was utilized for the preparation of the new monomers on the scale needed for the polymerization studies.…”

Preparation and stability of phenylated polysilanes

“…However, cyclosilanes which are completely substituted with organic groups are known (18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29). These compounds conform to the general formula (SiRg) , consisting of a cycle of n silicon atoms, each of which bears two organic groups.…”

“…It was also recognized that a compound identical with (21). Under these conditions, the cyclosilane was formed in rather low yield along with polymeric materials, one of which was characterized as a dimethylsilylene polymer with an average degree of polymerization of 55 units.…”

“…Dodecamethylcyclohexasilane was characterized by analysis and molecular weight, and was reported to have a crystal transition temperature of 74° (21). It readily sublimes at 100° and melts at 250-252° in a sealed tube.…”