Effect of colloidal platinum on the kinetics and mechanism of the initial stages of the bulk polymerization of styrene—II

Abstracts

528 ductivity

fall

(to

b= 10-a ohm-l.

value of the static magnetic to 400” and above conductivity. structure

is no relation

The results obtained

on the character

*EFFECT THE

there

cm-*

OF

STAGES

AN equation

of the colloid

The activation been shown activation

energy

that

energy

inhibition energy

This

is connected

POLYESTERS

AND

for

KINETICS

AND

of crystalline

MECHANISM

Vysokomol.

of termination

(about

and becomes transition

mechanism.

heated

of electro-

from

kinetic

1 kcal/mole)

negative

has been

chains

of radicals. data.

It has

is less than

with

increase

that

the

in extent

mechanism

shown

at the walls (glass) equals the activa.tion

soedin.

of polymer

of the bimolecular

It

OF

OF STYRENE--II

has been calculated

of inhibition

with

to a trimolecular

(7 kcal/mole)

THE

and A. L. Bortnichuk,

of bulk chain termination

reaction

and the value

in terms of the effect

based on the assumption

energy

and the

in the polymer.

POLYMERIZATION

of chain termination

of chain termination

agation

ON

BULK

signal

signal

For specimens

metal and the vessel walls and of bulk recombination

the activation

of polymerization.

the ESR

interaction

PLATINUM

OF THE

has been derived,

a maximum.

have been explained

A. D. Stepukhovich, E. A. Rafikov 4: No. 2, 182-187, 1962.

at the particles

EwO-I eV) whereas the ESR

pass through between

of electron

COLLOIDAL

INITIAL

and

susceptibility

of the

the activation

energy

of chain prop-

styrene.

POLYMERIC

SALTS

OF BOROMC

AND

I,4-BENZENEDIBORONIC

ACIDS

V. V. Korshak, V. A. Zamyatina, soedin. 4: No. 2, 188-191, 1962. of boronic

POLYESTERS organotin

and

Ma Zhui-zhan and R. M. Oganesyan, Vysokomol.

and 1,4-benzenediboronic

organozinc

salts

acids have been synthesized.

of

ACIDS

and V. A. Zamyatina,

Vysokomol.

of tet,ra-alkyl

has been

under the experimental diboronic amines

acid condenses

1,4-benzenediborates

investigated. conditions

It

PROPERTIES

THE

results of an investigation a large range

of stretching

that

since the ini.tially-formed structure

OF RUBBER

S. N. Zhurkov, T. P. Sanfirova 41 No. 2, 196-200, 1962. over

with aromatic

has been found

to polyaminopolyanhydride

and of three-dimensional

MECHANICAL

salts, polymeric

1,4-benzenediboronic

OF 1,4-BENZENEDIBORONIC

V. V. Korshak, Ma Zhui-zhan No. 2, 192-195, 1962. and diamines

and

They were found to be the most stable high-melting

POLYAMINOPOLYANHYDRIDES

THE polycondensation

acids with pentaerythritol

pentaerythritoxydiboronic

amines obtained

in the case of mono-

in the case of the diamines. AT HIGH

of the mechanical

t6’ lo6 o/o/set) ‘have been pfesented.

is not

4:

diester of 1,4-benzene-

of linear structure

STRETCHING

and E. E. Tomashevskii,

rates (from

soedin.

and aliphatic

polyborazol

diamino

substances.

properties

Vysokomol.

of natural and synthetic

1 to lo5 and in a number

The change

in strength

VELOCITIES

with

change

soedin. rubbers

of cases from

1O-5

in stretching

rate