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Thermal and rheological properties of maleated polypropylene modified asphalt
Author(s) -
Yeh PeiHung,
Nien YuHsun,
Chen JeanHong,
Chen WeiChyum,
Chen JianShiuh
Publication year - 2005
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.20386
Subject(s) - materials science , rheology , asphalt , polypropylene , composite material , dynamic shear rheometer , differential scanning calorimetry , crystallinity , scanning electron microscope , tacticity , dispersion (optics) , polymer , rheometer , polymerization , thermodynamics , physics , optics
Modified asphalts using polymeric additives, such as isotactic polypropylene (iPP) and maleated polypropylene (MPP), for asphalt binders were prepared and characterized for potential usages in pavement construction. The differential scanning calorimetry (DSC) studies show that most of the crystallinity of iPP remains intact in the asphalt binders, but MPP exhibits more interaction with the asphalt due to the increase of the amorphous region of MPP. The phase distributions and rheological properties of the modified asphalts were examined by scanning electron microscope (SEM) and dynamic shear rheometer (DSR), respectively. The images of SEM show that the MPP‐rich phase is larger than the iPP‐rich phase in asphalt blends, which contributes to more dispersion of the polymer into the asphalt phase in the asphalt/MPP blend. From the rheological studies, the asphalt blends containing iPP exhibit higher viscosity in terms of higher temperature to get Newtonian behavior and have a higher performance grade for rutting resistance at high temperature and frequency. POLYM. ENG. SCI., 45:1152–1158, 2005. © 2005 Society of Plastics Engineers