Because the properties of the block copolymers are highly dependent on their molecular characteristics, such as molecular weight, chain architecture, and composition of the elastomeric block, a series of SBEBS copolymers was prepared by homogeneous hydrogenation of SBS.
Similar results were observed with the other SBEBS samples.
1]) of both samples were unchanged, verifying that the Ti/Li catalytic system selectively saturated the polybutadiene block; similar results were observed for the other SBEBS polymers.
Data from the FTIR spectra of both the SBS and resultant SBEBS polymers were used together with Eq.
tr] of the SBEBS copolymers, as calculated from the FTIR spectra.
Samples of SBS and SBEBS were analyzed by GPC to determine the effect of the hydrogenation process on the molecular weight of the polymer; potential changes in the hydrodynamic volume of the SBS to the SBEBS were not considered.
Different aspects of asphalt modification with SBS or SBEBS have been reported.
The SBEBS were obtained by partial hydrogenation of two commercial SBS (Solprene 416 and 411), which differ from each other in their global molecular weight and size of the polybutadiene-b and polystyrene-b.
x]]-b-styrene) triblock copolymers SBEBS (P1H and P2H) were, respectively, produced from mild homogenous hydrogenation of PI and P2, using Ni/Li catalyst (28).
x]]-b-styrene) SBEBS used to prepare the polymer-modified asphalts.
Samples of P-MA with 3 and 10 wt% of SBS or SBEBS were produced through high-temperature mixing process, using a stainless steel tank equipped with a thermal jacket and high shear rate stirrer (IKA, Yellow Line OST 20); nitrogen atmosphere blanket was used to minimize polymer degradation.
1 and 2 and Table 2, P-MAs with 3 wt% of either SBS or SBEBS (Fig.