Divinylbenzenes

Divinylbenzenes
Surname	o -divinylbenzene	m -divinylbenzene	p -divinylbenzene
other names	1,2-divinylbenzene, 1,2-diethenylbenzene	1,3-divinylbenzene, 1,3-diethenylbenzene	1,4-divinylbenzene, 1,4-diethenylbenzene
Structural formula
CAS number	91-14-5	108-57-6	105-06-6
	1321-74-0 (mixture of isomers)
PubChem	66666	7941	66041
Molecular formula	C 10 H 10
Molar mass	130.19 g mol −1
Physical state	liquid		firmly
Brief description	water-clear, irritating to the mucous membranes, easily polymerizable, flammable liquid		combustible solid
Melting point	−67 ° C	−67 ° C	31 ° C
boiling point	200 ° C	200 ° C	95–96 ° C (24 hPa )
solubility	-	52 mg / l (25 ° C)	practically insoluble in water
GHS labeling	Caution	no classification available	Caution
H and P phrases	315-319-335-411	see above	315-319-335-411
	no EUH phrases	see above	no EUH phrases
	273-302 + 352-304 + 340 305 + 351 + 338	see above	273-302 + 352-304 + 340 305 + 351 + 338

The divinylbenzenes are aromatic hydrocarbons having the general formula C ₁₀ H ₁₀ . They consist of a benzene ring with two vinyl groups  (–CH = CH ₂ ) as substituents . Their different arrangement ( ortho , meta or para ) result in three constitutional isomers . Technical divinylbenzene is a mixture of the ortho , meta and para isomers (1,2-, 1,3- and 1,4-divinylbenzene).

properties

o - and m -Divinylbenzene are water-clear, mucous membrane-irritating, easily polymerizable, flammable liquids. The p -divinylbenzene, which has the highest symmetry, has the highest melting point and is a solid. They are insoluble in water.

use

Divinylbenzenes are mainly used as crosslinkers in the production of styrene copolymers , which results in reduced solubility in most organic solvents , improved heat resistance, higher hardness and strength without affecting the appearance or optical and electrical properties. By far the largest amount is consumed in the production of copolymers with styrene derivatives for use as ion exchange material . As a rule, technical mixtures are polymerized with a proportion of 55% or 80%.

Individual evidence

1. ↑ Entry for CAS no. 1321-74-0 in the GESTIS substance database of the IFA , accessed on March 13, 2017(JavaScript required) .
2. ↑ ^{a b c d} Entry on 1,2-divinylbenzene in the GESTIS substance database of the IFA , accessed on March 13, 2017(JavaScript required) .
3. ↑ ^{a b c} Entry on 1,3-divinylbenzene in the GESTIS substance database of the IFA , accessed on March 13, 2017(JavaScript required) .
4. ↑ ^{a b c d} Entry on 1,4-divinylbenzene in the GESTIS substance database of the IFA , accessed on March 13, 2017(JavaScript required) .