Blends of thermoplastic polyurethane (TPU) and polydimethyl siloxane rubber (PDMS), part-I: assessment of compatibility from torque rheometry and mechanical properties

  • Krishna Prasad Rajan
  • Ahmed Al-Ghamdi
  • P. Ramesh
  • G. B. Nando
Original Paper


Thermoplastic polyurethane (TPU) and polydimethyl siloxane rubber (PDMS) are two major polymers used extensively for biomedical applications. Blending of these polymers combines the superior mechanical properties, abrasion resistance, solvent resistance and aging resistance of TPU with chemical stability, inertness, flexibility and biocompatibility of PDMS. In the present investigation, an 80:20 blend of TPU and PDMS was selected for the preparation of an in situ compatibilized blend using ethylene methyl acrylate copolymer (EMA) as the compatibilizer. Effect of EMA on blends of ester type and ether type TPU with PDMS was studied. From the results obtained from torque rheometry, mechanical property evaluation, fourier transform infrared spectroscopy (FTIR), atomic force microscopy (AFM) and scanning electron microscopy (SEM), it was concluded that 5 wt% of compatibilizer effectively compatibilized an 80:20 blend of ester type TPU and PDMS, whereas similar blend of ether type TPU required only 2 wt% compatibilizer.


Thermoplastic polyurethane Polydimethyl siloxane rubber Compatibilizer Torque rheometry Mechanical properties Scanning electron microscopy 



The authors wish to gratefully acknowledge the valuable suggestions and advice provided by Prof Sadhan Kumar De (Chair Professor in Chemical Engineering, King Fahad University of Petroleum and Minerals, Dhahran, Kingdom of Saudi Arabia)


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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Krishna Prasad Rajan
    • 1
  • Ahmed Al-Ghamdi
    • 1
  • P. Ramesh
    • 2
  • G. B. Nando
    • 3
  1. 1.Department of Chemical Engineering TechnologyYanbu Industrial College, Royal Commission for Jubail and YanbuYanbu Industrial CityKingdom of Saudi Arabia
  2. 2.Biomedical Technology Wing, Sree Chitra Tirunal Institute for Medical Sciences and TechnologyThiruvananthapuramIndia
  3. 3.Rubber Technology Centre, Indian Institute of TechnologyKharagpurIndia

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