Glass transitions and mixed phases in block SBS

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Journal titleJournal of Polymer Science, Part B: Polymer Physics
IssueFebruary 3
Pages276279; # of pages: 4
Subjectbitumen modifier, calorimetry, MDSC, DMA, SBS; Roads/Pavement; Roads
AbstractDifferential scanning calorimetry (DSC) does not allow for easy location of the glass transition temperature of the polystyrene (PS) block in styrene-butadiene-styrene (SBS) block copolymers. Modulated DSC (MDSC), which deconvolutes the standard DSC signal into reversing and non-reversing signals, was used to locate the glass transition temperature (Tg) of both the polybutadiene (PB) and PS blocks in SBS. The Tg of the PB block was sharp at ?92°C, but that for the PS blocks was extremely broad, from ?60 to 125°C with a maximum at 68°C because of blending with PB. PS blocks were found only to exist in a mixed PS-PB phase, which concurred with the results from dynamic mechanical analysis. Annealing did not allow for a segregation of the PS blocks into a pure phase, but allowed for the segregation of the mixed phase into two mixed phases, one was PB-rich and the other PS-rich. It is concluded that three phases coexist in SBS: PB, PB-rich and PS-rich phases.
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AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number47658
NPARC number20378031
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Record identifier9563ad41-c8b8-4779-a661-a0e487921c40
Record created2012-07-24
Record modified2016-05-09
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