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Abstract
Simple binary blends of bitumens and polymers consist of two-phase mixtures of service temperatures. The characteristics of the two phases, one rich in asphaltenes and the other rich in polymer, are rather different, and the compound properties are dominated by the continuous phase. In blends of bitumens with an SBS elastomer, the polymer-rich phase becomes continuous at SBS concentrations of 5 percent to 8 percent, depending on the nature of the bitumen. The polymer-rich phase comprises most of the polymer, which is extended with maltenes from the bitumen. The polymer forms a network in this phase and, hence, if this phase is the continuous one, a network in the bituminous compound. If two SBS polymers are used, a polymer network can also be built up from the two, provided they have fairly similar compositions and molecular weights. If polymers differ too widely, this may reduce their effectiveness as elastomers compared with that in single-polymer blends.
Simple binary blends of bitumens and polymers consist of two-phase mixtures of service temperatures. The characteristics of the two phases, one rich in asphaltenes and the other rich in polymer, are rather different, and the compound properties are dominated by the continuous phase. In blends of bitumens with an SBS elastomer, the polymer-rich phase becomes continuous at SBS concentrations of 5 percent to 8 percent, depending on the nature of the bitumen. The polymer-rich phase comprises most of the polymer, which is extended with maltenes from the bitumen. The polymer forms a network in this phase and, hence, if this phase is the continuous one, a network in the bituminous compound. If two SBS polymers are used, a polymer network can also be built up from the two, provided they have fairly similar compositions and molecular weights. If polymers differ too widely, this may reduce their effectiveness as elastomers compared with that in single-polymer blends.
Date
0/1989
0/1989
Author(s)
W C Vonk; A L Bull
W C Vonk; A L Bull
Page(s)
210-223
210-223
Keyword(s)
SBS elastomer; two phase mixture; asphaltene; polymer
SBS elastomer; two phase mixture; asphaltene; polymer