ChemicalBook CAS DataBase List 9003-27-4

9003-27-4

Name	POLYISOBUTYLENE
CAS	9003-27-4
EINECS(EC#)	204-066-3
Molecular Formula	(C4 H8)n
MDL Number	MFCD00084436
Molecular Weight	56.1063
MOL File	9003-27-4.mol

Chemical Properties

Appearance	clear viscous liquid
Melting point	54-56 °C
Boiling point	300 °C
density	0.92 g/mL at 25 °C(lit.)
Tg	-61
Tg	-62
Tg	-64
Tg	-75
refractive index	n20/D 1.51
Fp	>212
Fp	>482
form	slab/chunk
Stability:	Stability Combustible. Incompatible with strong oxidizing agents.
InChI	InChI=1S/C4H8/c1-4(2)3/h1H2,2-3H3
InChIKey	VQTUBCCKSQIDNK-UHFFFAOYSA-N
SMILES	C=C(C)C
Uses	polyisobutene (hydrogenated) is an emollient. less more
EPA Substance Registry System	Polyisobutylene (9003-27-4)

Safety Data

Safety Statements	24/25 less more
WGK Germany	3
RTECS	UD1010000
TSCA	TSCA listed
HS Code	39022000
Hazardous Substances Data	9003-27-4(Hazardous Substances Data)

Raw materials And Preparation Products

Hazard Information

Chemical Properties

clear slab

Definition

ChEBI: A polymer composed of repeating 1,1-dimethylethylene units.

Application

Polyisobutylene (PIB) is a vinyl polymer with a uniquely low water diffusion rate and low glass transition temperature (Tg) (-75 °C). It is widely available for use in the following ways:
(1) PIB can be used as a common encapsulation material for photovoltaic modules.
(2) Chemically inert elastomers with oxidation and thermal degradation resistance and low gas permeability.
(3) Plasticisers in rubber formulations and sporting goods (e.g. golf clubs, tennis rackets, grips for bicycles and tools).
(4) Adhesive compositions used as wound dressings where PIB acts as a tackifier.
(5) Functionalisation of polyisobutylene with pyrene by photoinduced radical addition of 1-bromomethylpyrene in the presence of Mn2(CO)10 during the preparation of polyisobutylene-based block copolymers.
(6) Highly reactive polyisobutylene (HRPIB) is the most important industrial polymer material used as a lubricant, fuel and polymer additive. In contrast to conventional Polyisobutylene, HRPIB is a polymer using olefins as end groups.

Preparation

Silicone rubbers are prepared as follows:
Preparation of Silicone rubbers

Other groups may replace the methyl groups. Silicone rubbers have excellent ozone and weathering resistance, good electrical properties, and good adhesion to metal.

Solubility in organics

non-polar organic solvents (i.e. aliphatic, aromatic, cyclic and halogenated hydrocarbons), THF

Solubility in organics

non-polar organic solvents (i.e. aliphatic, aromatic, cyclic, and halogenated hydrocarbons), THF

Solubility in organics

Non-polar organic solvents (i.e., aliphatic, aromatic, cyclic, and halogenated hydrocarbons), THF

Spectrum Detail

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