Poly(isobutene)

Poly(isobutene)

Poly(isobutene)

NAMES AND IDENTIFIERS OF POLYMER

POLYMER CLASS	Polyalkene (Polyolefin)
COMMON NAMES	Poly(isobutene), Poly(isobutylene), Butyl rubber
STRUCTURE BASED NAME	Poly(1,1-dimethylethylene), Poly(2-methylprop-1-ene)
ACRONYMS	PIB
CAS #	9003-27-4
CurlySMILES	C{-}C{n+}(C)(C)

IDENTIFIERS OF MONOMER(S)

CAS #	68606-25-7
COMMON NAMES	Isobutene
SMILES	CC(=C)C
Std. InChI	1S/C4H8/c1-4(2)3/h1H2,2-3H3
Std. InChIKey	VQTUBCCKSQIDNK-UHFFFAOYSA-N
STRUCTURE

Thermo-Physical Properties: Experimental / Literature Data

PROPERTY	UNIT	VALUE / RANGE	PREFERRED
Molar Volume V_m	mL mol^-1	61.4 - 66.8	63.8
Density ρ	g mL^-1	0.84 - 0.91	0.88
Solubility Parameter δ	MPa^1/2	14.4 - 17.7	15.8
Molar Cohesive Energy E_coh	J mol^-1	13400 - 20300	16300
Glass Transition Temperature T_g	K	195 - 208, 243	202
Molar Heat Capacity C_p	J (mol K)^-1	109.5 - 110.5	110
Entanglement Molecular Weight M_e	g mol^-1	5900 - 10500	7950
Index of Refraction n	none	1.505 - 1.51	1.51

Thermo-Physical Properties: Calculated Data

PROPERTY	UNIT	VALUE / RANGE	PREFERRED
Molecular Weight of Repeat unit	g mol^-1	56.11
Van-der-Waals Volume V_vW	mL mol^-1	41.12
Molar Volume V_m	mL mol^-1	62.2 - 66.6	64.7
Density ρ	g mL^-1	0.84 - 0.90	0.87
Solubility Parameter δ	MPa^1/2	15.1 - 15.9	15.4
Molar Cohesive Energy E_coh	J mol^-1	14200 - 16500	15400
Glass Transition Temperature T_g	K	199 - 202	201
Molar Heat Capacity C_p	J (mol K)^-1	112 - 117	114
Entanglement Molecular Weight M_e	g mol^-1	6900 - 8200	7600
Index of Refraction n	none	1.47 - 1.51	1.49

Last updated: December 10, 2019

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