Polymerisation Processes Polymerisation Processes Polyethylene ...

HIPS, solution/mass ABS - principles
Rubber ( PBu) dissolved in Styrene
(/ Ethyl benzene)
Polymerization of styrene, homo-PS
and grafted PBu
Phase separation ( PBu/S and PS/S)
Phase inversion
Particle formation
End of reaction
A
B
D
C
Course of reaction
Dr. Klaus-Dieter Hungenberg, BASF AG Ludwigshafen Vorlesung Polymerisationstechnik, Universität Paderborn, WS 07/08 Polymer processes
HIPS – phase inversion in first 2 reactors
Viscosity
Reactor 1 Reactor 2
in out in out
Homogene
Lösung
Polybutadiene in styrene
Polystyrene in styrene
conversion
Phase inversion when
volume ratio = 1:1 of
disperse : continuous phase
Stabilization of particles by
graft polymers formed in 1. reactor
Dr. Klaus-Dieter Hungenberg, BASF AG Ludwigshafen Vorlesung Polymerisationstechnik, Universität Paderborn, WS 07/08 Polymer processes
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HIPS grafting and phase inversion
PBu in S PS in S
S S
Phase separation Phase inversion
S
B
B
B
B
S S
S S
B
B
B
S B B
S
S
Graft copolymers needed for
stabilization of morphology
S
B
B
B
B
B
S
S
S
S
B
BS
B
B B
S
S
S
Dr. Klaus-Dieter Hungenberg, BASF AG Ludwigshafen Vorlesung Polymerisationstechnik, Universität Paderborn, WS 07/08 Polymer processes
HIPS – phase inversion in first 2 reactors
Viscosity
Conversion
Dr. Klaus-Dieter Hungenberg, BASF AG Ludwigshafen Vorlesung Polymerisationstechnik, Universität Paderborn, WS 07/08 Polymer processes
S
50
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