Chemistry Reference
In-Depth Information
ane) in the presence of aluminum chloride is proposed in Ref. [331]. The
polyketones have the intrinsic viscosity more than 0.37 dL/g (at 30 °C,
in concentrated H
2
SO
4
), glass transition temperature is 120-231 °C and
melting point lies within 246-367 °C. The polyketones start decompos-
ing at a temperature of 400 °C, the temperature of 10% loss of mass is
480-530 °C.
It is possible to produce polyketones by the reaction of aromatic di-
carboxylic acid and aromatic compound containing two reactive groups
[332]. The reaction is catalyzed by the mix of phosphoric acid and car-
boxylic acid anhydride having the formula of RC(O)O(O)CR (R stands
for not-substituted or substituted alkyl, in which one, several or all hydro-
gen atoms were replaced by functional groups and each R has the Gamet
constant σ
m
≥ 0.2). The pressed articles can be created from synthesized
polyketones.
The aromatic polyketones can be synthesized [333] when conducting
the Friedel-Craft polymerization with acylation by means of the interac-
tion of 2,2{}bis(arylphenoxy)bisphenyls with chlorides of arylenebicar-
bonic acids in the presence of AlCl
3
. The polyketones obtained using the
most efficient 2,2{}bis(4-bezoylphenoxy) bisphenyl are well soluble in
organic solvents and possess high heat resistance.
Also, the aromatic polyketones are produced [334] by the reaction of
electrophylic substitution (in dispersion) of copolymer of aliphatic vinyl
compound (1-acosen) with N-vinylpirrolydone, at ratio of their links close
to equimolar.
The other method of synthesizing aromatic polyketones includes the
interaction of monomer of formula [HC(CN)(NR
2
)]Ar with 4,4′-difluoro-
bisphenylsulfone in dimethylsulfoxide, dimethylformamide or N-methyl-
pirrolydone at 78-250 °C in the presence of the base [335]. The soluble
polyaminonitrile of formula [C(CN)(NR
2
)ArC(CN)(NR
2
)C
6
H
4
SO
2
C
6
H
4
]
n
is thus produced (Ar denotes m-C
6
H
4
, NR
2
- stands for group -NCN-
2
CH
2
OCH
2
CH
2
). When acid hydrolysis of polyaminonitrile is carried out
the polysulfoneketone of formula [COArCOC
6
H
4
SO
2
C
6
H
4
]
n
forms with
glassing temperature of 192 °C, melting point 257 °C and when 10% mass
loss happens at 478 °C. The acid hydrolysis can be performed in the pres-
ence of
n
-toluenesulfoacid, trifluoroacetic acid, and mineral acids.
The synthesis of aromatic polyketone particles has been carried out
[336] by means of precipitation polycondensation and is carried out at
very the low concentration of monomer [0.05 mol/L]. The polyketones are
