SiSiB® PC5220
Dimethyldichlorosilane
SiSiB® PC5130, SiSiB® PC5220 and SiSiB® PC5310 are formed by reaction of metallic silicon or ferrosilicon with hydrogen chloride or chlorine. SiSiB® PC5220 is a colorless clear liquid.
Technical Data
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CAS No. |
75 78 5 |
|
EINECS No. |
200-901-0 |
|
Formula |
C2H6Cl2Si |
|
Molecular Weight |
|
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Boiling Point |
70°C [760mmHg] |
|
Flash Point |
-7°C |
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Color and Appearance |
Colorless clear liquid |
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Density 25/25°C |
|
|
Refractive Index |
|
Application
Methyl chlorosilanes have one to three methyl groups. In the case of SiSiB® PC5220 dimethyldichlorosilane, dimethyl dichloro silane, two chlorine atoms are available, so that a reaction with excess water produces a linear chain of ether-like linkages between silicon atoms.
As in polyethers, these flexible linkages produce a rubbery polymer, polydimethylsiloxane (PDMS). Trimethylchlorosilane (SiSiB® PC5310) can be used to induce branching and cross-linking in PDMS molecules, while chlorotrimethylsilane serves to end backbone chains, limiting molecular weight.
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