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December
12, 2001
Thermal
Stability of Three Basic Elastomer Types
From their basic structure,
thermoplastic elastomers may be broadly categorized as:
SBS (styrene/butadiene/styrene tri-block copolymers);
SBBS (styrene/(butadiene/butylene)/styrene tri-block copolymers);
and SEBS (styrene/(ethylene/butylene)/styrene tri-block
copolymers).
As indicated by these accelerated aging test results,
SEBS and SBBS generally show higher thermal stability,
an effect of the complete or selective hydrogenation of
the unsaturated double bonds in their butadiene segments.
Test elastomers
(styrene content, 21 wt%; no thermal stabilizer
added):
Polybutadiene block double-bond
partially hydrogenated; basic category of Tuftec™
P
SEBS:
Polybutadiene block double-bond
completely hydrogenated; basic category of Tuftec™
H
Fig.
1. SBS, SBBS, and SEBS at 220°C
Fig.
2. SBS and SBBS rapid-gelling temp.
Please note that all data and values
are given as typical results obtained with the indicated
test methods,
and not as any product specification or warranty of any
nature.
