[1] Indian Inst Technol, Ctr Rubber Technol, Kharagpur 721302, W Bengal, India
[2] Ecole Polytech Fed Lausanne, Inst Mat, CH-1015 Lausanne, Switzerland
[3] Ecole Polytech Fed Lausanne, Inst Sci & Ingn Chim, Lab Polymeres, CH-1015 Lausanne, Switzerland
[4] Univ Warwick, Dept Chem, Coventry CV4 7AL, W Midlands, England