1,1-Difluoroethylene, also known as vinylidene fluoride, is a hydrofluoroolefin. This colorless, flammable gas is a difluorinated derivative of ethylene. Global production in 1999 was approximately 33,000 metric tons.[3] It is primarily used in the production of fluoropolymers such as polyvinylidene fluoride and FKM.
Names | |||
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Preferred IUPAC name 1,1-Difluoroethene | |||
Other names Difluoro-1,1-ethylene; R-1132a; Halocarbon 1132 A; Freon 1132A; Vinylidene difluoride; Vinylidene fluoride[1] | |||
Identifiers | |||
3D model (JSmol) | |||
Abbreviations | VDF | ||
ChEBI | |||
ChEMBL | |||
ChemSpider | |||
ECHA InfoCard | 100.000.789 | ||
EC Number |
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KEGG | |||
PubChem CID | |||
RTECS number |
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UNII | |||
UN number | 1959 | ||
CompTox Dashboard (EPA) | |||
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Properties | |||
C2H2F2 | |||
Molar mass | 64.035 g·mol−1 | ||
Appearance | Colorless gas[2] | ||
Odor | Slightly ethereal[1] | ||
Density | 2.89 kg/m3 (vapor, 0 °C)[2] 1.122 g/mL (liquid, -84 °C)[2] | ||
Melting point | −144 °C (−227 °F; 129 K)[2] | ||
Boiling point | −84 °C (−119 °F; 189 K)[2] | ||
0.254 g/L[3] | |||
Vapor pressure | 35.2 atm (20°C)[4] | ||
Hazards | |||
Occupational safety and health (OHS/OSH): | |||
Main hazards | Flammable[4] | ||
GHS labelling: | |||
Warning | |||
H315, H319, H335 | |||
P261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P403+P233, P405, P501 | |||
380 °C (716 °F; 653 K)[1] | |||
Explosive limits | 5.5%-21.3%[4] | ||
NIOSH (US health exposure limits): | |||
PEL (Permissible) | none[4] | ||
REL (Recommended) | TWA 1 ppm C 5 ppm[4] | ||
IDLH (Immediate danger) | N.D.[4] | ||
Related compounds | |||
Related compounds | 1,2-Difluoroethylene; Fluoroethylene; Trifluoroethylene; 2-Chloro-1,1-difluoroethylene; | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). |
Preparation
1,1-Difluoroethylene can be prepared by elimination reaction from a 1,1,1-trihaloethane compound, for example, loss of hydrogen chloride from 1-chloro-1,1-difluoroethane:[5]
or loss of hydrogen fluoride from 1,1,1-trifluoroethane:[6]
See also
References
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