Anionic polymerization of hexafluoro-1,3-butadiene

79

B17

ANIONIC

POLYMERIZATION

OF HEXAFLUORO-1

,MWTADIENE

T. Narita Department Technology,

As

of Environmental Engineering, Saitama Institute Okabe-machi, Csato-gun, Saitama 369-02, Japan

has

previously

(HFBD)

been

which

conditions

is

is

tiator[l].

easily

The

results

of

fluoride,

dium

naphthalene

since

the The

was

found

to

of

to

take

the

at

The

place

in

an

any

decomposrtion

and

toluene

one

[l]

T. al.,

although

reaction

the that

fashion

by

by

reaction reactions

of

was,

im-

examined The

than

the

poly-

therefore,

adding

softening

about which

thermal

thrrd

of

Narita, Makromol.

et

of

changed al., Chem.,

and

heating was

expansion

that

substance

point

360°C

417’C,

scarcely

powdery

in-

tert-butoxide

which

hexafluorobenzene.

after

The

efficients

white

measured

was

treatment.

the

were

point

hours

et

minutes

at

be

initiation

was

tert-C4HgOCs.

temperature

anionic

The

O°C

hours

thus

HFBD. at

activity 3

within

HFBD. except

about

fluoride, :I;;;

might

THF of

initiation

was

10

initiators

high

70% of

5

lower

obtained

in

ini-

detailed

Cesium

surprisingly

in

within

much

solvents

tening

an

more

several

counter-cations

concentration

ble CsF

with

over

polymerization

Poly(HFBD) in

show were

tert-C4HgOCs

reaction.

to

HFBD

as

the

counter-cation.

to the

completed

out

merization

of

with

be

carried

found

anionic

HFBD

measurement

ferred

with

Rb+$~~~~~hy~:~~~~ne~~~~~~~le~~~

poly(HFBD)

radius

the

of

anion

are of

ionic

the were

as

tert-C4HgORb,

in

reaction

of

rubidium

polymerization

fluoride

cesium

concerned

polymerization

yields

portant

is

,3-butadiene

radical

Cs+(cr-methylstyrene)

dium

60°C.

with

paper

or

hexafluoro-1 under

polymerized

cesium

tert-C4HgOCs,

briefly,

polymerized

present

anionic

possessing

reported

hardly

of

of

poly(HFBD)

339’C, the

78OC

was

higher

sample than

coefficient

of

a function

the the

Macromolecules, press.

22,

case polymer

T.

sof-

400°C

temperature.

2025(1989);

with

The at

These

of

of

yielded

respectively.

same

insolu-

beginning

poly(tetrafluoroethylene). as

in

The

Narita

for of

no was co-