Effect of montmorillonite on properties of styrene–butadiene–styrene copolymer modified bitumen

Clay/styrene–butadiene–styrene (SBS) modified bitumen composites were prepared by melt blending with different contents of sodium montmorillonite (Na-MMT) and organophilic montmorillonite (OMMT). The structures of clay/SBS modified bitumen composites were characterized by XRD. The XRD results showed that Na-MMT/SBS modified bitumen composites may form an intercalated structure, whereas the OMMT/SBS modified bitumen composites may form an exfoliated structure. Effects of MMT on physical properties, dynamic rheological behaviors, and aging properties of SBS modified bitumen were investigated. The addition of Na-MMT and OMMT increases both the softening point and viscosity of SBS modified bitumens and the clay/SBS modified bitumens exhibited higher complex modulus, lower phase angle. The high-temperature storage stability can also be improved by clay with a proper amount added. Furthermore, clay/SBS modified bitumen composites showed better resistance to aging than SBS modified bitumen, which was ascribed to barrier of the intercalated or exfoliated structure to oxygen, reducing efficiently the oxidation of bitumen, and the degradation of SBS. POLYM. ENG. SCI., 47:1289–1295, 2007. © 2007 Society of Plastics Engineers

[1]  M. Siddiqui,et al.  Studies on the aging behavior of the Arabian asphalts , 1999 .

[2]  Yong Zhang,et al.  Thermo-rheological properties and storage stability of SEBS/kaolinite clay compound modified asphalts , 2006 .

[3]  K. Wei,et al.  The effect of nano-sized silicate layers from montmorillonite on glass transition, dynamic mechanical, and thermal degradation properties of segmented polyurethane , 2002 .

[4]  Yong Zhang,et al.  Improved properties of SBS‐modified asphalt with dynamic vulcanization , 2002 .

[5]  Ulf Isacsson,et al.  Chemical and rheological evaluation of ageing properties of SBS polymer modified bitumens , 1998 .

[6]  Yong Zhang,et al.  Rheological characterization of storage-stable SBS-modified asphalts , 2002 .

[7]  Ahmet Gültek,et al.  Preparation and phenol captivating properties of polyvinylpyrrolidone-montmorillonite hybrid materials , 2001 .

[8]  G. Airey.  Rheological properties of styrene butadiene styrene polymer modified road bitumens , 2003 .

[9]  N. Salahuddin,et al.  Nanocomposite materials based on polyurethane intercalated into montmorillonite clay , 2005 .

[10]  Xiaohu Lu,et al.  Influence of styrene-butadiene-styrene polymer modification on bitumen viscosity , 1997 .

[11]  M. A. Mull,et al.  Fracture resistance characterization of chemically modified crumb rubber asphalt pavement , 2002 .

[12]  J. Jog,et al.  Effect of modified layered silicates and compatibilizer on properties of PMP/clay nanocomposites , 2003 .

[13]  Mustaque Hossain,et al.  Fracture and Tensile Characteristics of Asphalt-Rubber Concrete , 1999 .

[14]  S. Qutubuddin,et al.  Synthesis and Characterization of ‘Epoxyphilic’ Montmorillonites , 1994, Clay Minerals.

[15]  H. Bianchetto,et al.  Effect of the thermal degradation of SBS copolymers during the ageing of modified asphalts , 2004 .

[16]  C. Zilg,et al.  Nanofillers based upon organophilic layered silicates , 2001 .

[17]  Jian-Shiuh Chen,et al.  Thermal and Rheological Properties of Maleated Polypropylene Modified Asphalt , 2005 .

[18]  R. Mülhaupt,et al.  Synthesis and thermal behaviour of layered silicate-EVA nanocomposites , 2001 .

[19]  Yong Zhang,et al.  Preparation and properties of styrene–butadiene–styrene copolymer/kaolinite clay compound and asphalt modified with the compound , 2005 .

[20]  M. Scarsella,et al.  Improving the ageing resistance of straight-run bitumens by addition of phosphorus compounds , 1995 .

[21]  Andy Collop,et al.  Properties of polymer modified bitumen after rubber-bitumen interaction , 2002 .

[22]  Richard R. Davison,et al.  The effect of long-term oxidation on the rheological properties of polymer modified asphalts☆ , 2003 .