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Paper Information

Journal:   IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN)   FEBRUARY-MARCH 2008 , Volume 20 , Number 6 (ISSUE NO. 90); Page(s) 539 To 550.
 
Paper: 

MECHANICAL PROPERTIES OF THE BLENDS OF RECYCLED POLYPROPYLENE WITH BLOWN AND SOFT BITUMEN'S

 
 
Author(s):  HADADI V., YOUSEFI A.A.*, GANJI M.T., KHOSRAVI M.
 
* IRAN POLYMER AND PETROCHEMICAL INSTITUTE, TEHRAN, IRAN
 
Abstract: 

In this investigation, the mechanical properties of the blends of blown bitumen110/10, heavy vacuum slops (H.V.S), bitumen 60/70 penetration grade and isotactic polypropylene (iPP) were studied for the first time. Our results showed that modulus varies non-linearly and at certain asphaltenes contents a peak appears. Considering these phenomena it is revealed that in the absence of iPP, interactions between the asphaltenes control the modulus of the blends. These interactions are dependent on the H.V.S and soft bitumen contents. The asphaltenes establish strong interactions with other asphaltene groups during dissolution in H.V.S or bitumen 60/70 (called solubility limit). At low percentages of iPP and high concentrations of asphaltenes a segregated network of asphaltenes is formed. Formation of this network increases the modulus of blends. At higher percentages of iPP and low asphaltenes concentration an inter diffusion-coalescence network is established. This network creates transition structures and increases the blend modulus. Finally, it is found that incorporation of iPP improves the modulus of bituminous blends.

 
Keyword(s): RECYCLED POLYPROPYLENE, BLEND, MECHANICAL PROPERTIES, ASPHALTENE, INTERDIFFUSION-COALESCENCE
 
References: 
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