%0 Journal Article %T The Physical Modification of a Natural Rubber-Polypropylene Thermoplastic Elastomer Blend by Azobisformamide Blowing Agent %A Safia Merabet %A Farid Riahi %A Abdelmalek Douibi %J ISRN Polymer Science %D 2012 %I Hindawi Publishing Corporation %R 10.5402/2012/168798 %U http://dx.doi.org/10.5402/2012/168798