The colloidal structure of bitumen: Consequences on the rheology and on the mechanisms of bitumen modification
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Cites background from "The colloidal structure of bitumen:..."
...However, some theoretical trends were also highlighted based on the SARA (saturates, aromatics, resins and asphaltenes) fractions of bitumen: for example, high asphaltenes content may decrease the compatibility between polymer and bitumen and the aromaticity of the maltenes needs to fall between certain values to reach a good level of compatibility [78]....
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...Another example is some authors think asphaltenes are strongly polar components in bitumen and the polarity of polymer modifiers has a significant influence on their compatibility with bitumen and the final storage stability of the resulting PMBs [2, 78]; but some others believe asphaltenes are typical non-polar molecules from a chemical point of view [81]....
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...Regarding compatibilizers, it is valuable to mention that neither too poor nor too great compatibility is good for bitumen modification, because too poor compatibility causes phase separation problems while too great compatibility only leads to very limited improvements [53, 78]....
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...For example, some researchers believe that bitumen has a heterogeneous colloid structure and PMB should be investigated as a multiphase (polymers/asphaltenes/maltenes) viscoelastic emulsion [78, 79], shown as Figure 1; while some other researchers claim that bitumen is a homogeneous and continuous molecular solution based on their mutual solubility and polymers result in good effects on PMB by their partial solubility in bitumen [80], seen in Figure 2....
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...Adapted from [78] with permission from Elsevier....
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"The colloidal structure of bitumen:..." refers background in this paper
...As an example, amorphous linear polymers are generally thermorheologically simple materials [88,89,195]....
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...3 [306] and is theoretically 9/4 [88,195]....
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...Since it is quite difficult to express without introducing many details on the molecular motion of polymers [88,89,195], we will therefore not tackle this point any further....
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...Therefore, temperature only alters the Brownian dynamics of the molecules and molecular segments, hence changing only the absolute value of the relaxation times and not the overall relaxation function [88,195]....
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6,510 citations
"The colloidal structure of bitumen:..." refers background or methods in this paper
...6, with the reference temperature as an adjustable parameter, following the original WLF treatment [89,186]....
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...From then on and although TTSP does not strictly apply to bitumen, most authors starting by Van der Poel [185], plotted master curves using the shifting procedure developed by Williams, Landel and Ferry [89,186], as illustrated in Figure 24....
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...In this case, the parameters can be derived either from viscosity data or from the temperature dependence of the relaxation times which can be obtained by the WLF shifting procedure [89,186]....
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...Once the temperature falls well below say 100oC, it is more common to use either an Arrhenius or a WLF law [89,186]:...
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...The construction was based in fact on master-curves using the same shifting procedure that made famous Williams, Landel and Ferry a year later [186]....
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