Modification of TPE using selected additives / Lim Chun Piao
Blends of well characterized hydrogenated polystyrene-polybutadiene-polystyrene (SEBS) triblock and additives consisting tackifiers provide unique rubbery and glassy network interaction with controlled amounts of volume fraction (f) of certain phase. Such systems also provide quantitative informat...
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| Format: | Thesis |
| Published: |
2009
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| Subjects: | |
| Online Access: | http://studentsrepo.um.edu.my/6229/1/Modification_ofTPE_Using_Selected_Additives.pdf http://studentsrepo.um.edu.my/6229/ |
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| Institution: | Universiti Malaya |
| Summary: | Blends of well characterized hydrogenated polystyrene-polybutadiene-polystyrene (SEBS) triblock and
additives consisting tackifiers provide unique rubbery and glassy network interaction with controlled amounts of
volume fraction (f) of certain phase. Such systems also provide quantitative information correlated from the
concentrations of trapped chain entanglements in polymer additives blend. Two different resins (aliphatic type,
Sukorez SU420 and aromatic type, Norsolene W85) were blended carefully in various amounts with a typical
SEBS triblock copolymer (TSCR's Taipol 3152H) to form three series of samples for viscoelastic study. The
unusual behaviours in dynamic mechanical properties suggest that complex morphology of gyroid exists in
certain blending ratio.
The mechanical properties of these blended materials were studied in sinusoidal oscillation of film tension mode
at 1 Hz over a temperature range from room temperature to about 110°C. The effect of tackifier mixture on the
mechanical properties depends upon their compatibility and concentration in the network, as well as partial
interaction with other phase. It acts as a diluent, lowering the storage modulus in the rubbery region. Several
unexpected mechanisms appeared as a result of suspected gyroid structure formation, and their existence
resulted from certain critical volume fraction of components. The various mechanisms (chain architecture,
morphology formation, chain topology) associated with the polystyrene chains have been incorporated from
previous efforts whose parameters were given in terms of the structural and compositional features of complex
morphology formation. The correlation in between compatibility, morphology and rheology properties
successfully predicts the level and the location of the dynamic response for the various blends studied here. |
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