Natural weathering of styrene-butadiene modified bitumen

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TypeBook Chapter
Book titlePolymer Modified Bitumen
Pages138; # of pages: 38
Subjectnatural weathering, physico-chemical analysis, bituminous sealants, copolymers of polystyrene and polybutadiene; Building envelope
AbstractThis chapter reports on the long-term weathering of 12 bituminous sealants that contain thermoplastic elastomers, namely block copolymers of polystyrene and polybutadiene. The goal of the work was to determine the rate and mechanisms of sealant weathering so that future accelerated aging tests could be developed. By means of physico-chemical analysis much weathering was found to occur in the early years of service. Weathering pathways were found to be mass loss, oxidation, and copolymer degradation. Specific mechanisms include the loss of aromatics with time, the formation of sulphoxides, sulphones, and their acids, ketones, and carboxylic acids. Block copolymer degradation occurs mainly through a scission between polystyrene and polybutadiene blocks, and the crosslinking of polybutadiene fragments. The chapter ends with a brief discussion of the suitability of current accelerated aging tests to simulate the natural weathering of elastomeric sealants.
Publication date
PublisherChapter 10
AffiliationNRC Institute for Research in Construction; National Research Council Canada
NotePublisher: Woodhead Publishing Limited/CRC Press, Tony McNally Editor, 2011
Peer reviewedNo
NRC number54540
NPARC number20328572
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Record identifier1e84064c-7b4d-4f67-8a5d-93f119bc5ba9
Record created2012-07-18
Record modified2016-05-09
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