Polyisobutylene - Materials / Alfa Chemistry

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Polyisobutylene

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Catalog Number

ACMA00017129

Product Name

Polyisobutylene

Category

Polymers

Description

Isobutylene is a colorless gas with a faint petroleum-like odor. For transportation it may be stenched. It is shipped as a liquefied gas under its own vapor pressure. Contact with the liquid can cause frostbite. It is easily ignited. Its vapors are heavier than air and a flame can flash back to the source of leak very easily. The leak can either be a liquid or vapor leak. It can asphyxiate by the displacement of air. Under prolonged exposure to fire or heat the containers may rupture violently and rocket. It is used in the production of isooctane, a high octane aviation gasoline.;GasVapor; Liquid;GasVapor;COLOURLESS COMPRESSED LIQUEFIED GAS WITH CHARACTERISTIC ODOUR.

IUPAC Name

2-methylprop-1-ene

Molecular Weight

56.11g/mol

Molecular Formula

C4H8;CH2=C(CH3)2;C4H8

Canonical SMILES

CC(=C)C

InChI

InChI=1S/C4H8/c1-4(2)3/h1H2,2-3H3

InChI Key

VQTUBCCKSQIDNK-UHFFFAOYSA-N

Boiling Point

19.6 °F at 760 mm Hg (NTP, 1992);-6.9 °C;-7.0 °C;-6.9 °C

Melting Point

-220.5 °F (NTP, 1992);-140.4 °C;-140.7 °C;-140.3 °C

Flash Point

-105 °F (NTP, 1992);-80 °C (-112 °F) - closed cup;-105 °F (-76 °C);-76.1 °C c.c.

Density

0.59 at 68 °F (USCG, 1999);0.589 g/cu cm at 25 °C (p >1 atm);Relative density (water = 1): 0.59

Solubility

Insoluble (NTP, 1992);0.00 M;In water, 263 mg/L at 25 °C;Very soluble in ethanol and ether; soluble in benzene, sulfuric acid;Soluble in organic solvents;Solubility in water, g/100ml at 20 °C: 0.03

Color/Form

Colorless gas;Colorless volatile liquid or easily liquefied gas

Complexity

Covalently-Bonded Unit Count

EC Number

204-066-3;271-734-9

Exact Mass

56.0626g/mol

Formal Charge

Heavy Atom Count

ICSC Number

1027

Log P

2.34 (LogP);log Kow = 2.34;2.35

MeSH Entry Terms

2-methyl propene;2-methylpropene;isobutene;isobutylene

Monoisotopic Mass

56.0626g/mol

Odor

Coal gas odor

Other Experimental

Density: 0.6 at 20 °C;Polymerizes easily and reacts with numerous materials;Tastelss and odorless /Isobutylene polymers/;Heat of formation: -37.5 kJ/mol (liquid); -16.9 kJ/mol (gas);Henry's Law constant = 0.218 atm cu-m/mol at 25 °C;Hydroxyl radical rate constant = 5.14X10-11 cu cm/molec-sec at 25 °C

Refractive Index

Index of refraction: 1.3926 at 25 °C

Rotatable Bond Count

RTECS Number

UD0890000

Stability

Stable under recommended storage conditions.;Volatile liquid or easily liquefied gas.

UNII

QA2LMR467H

UN Number

1055;1055;1055;1055

Vapor Density