Characterization of room temperature ionic liquid solvent based free radical copolymerized network gels

Joseph F. Stanzione, Robert E. Jensen, Philip J. Costanzo, Giuseppe R. Palmese

Research output: Contribution to journalConference articlepeer-review


A potential polymer-based soft tissue surrogate for blunt impact testing was generated via a free radical copolymerization of 2-acrylamido-2-methyl-1- propanesulfonic acid (AMPS) monomer and N,N'methylenebis(acrylamide) (MBA) cross-linker using a room temperature ionic liquid (RTIL) as the solvent medium. Potassium persulfate (PPS) was used as the free radical polymerization initiator. The RTIL utilized was 1-ethyl-3-methylimidazolium ethylsulfate [EMIM][EtSO4]. For varying concentrations of AMPS and MBA in [EMIM][EtSO4] within the solubility space, thermomechanical analysis showed a glass transition temperature range of -85 to -60°C. Servo-mechanical analysis showed a compressive modulus range of 24 to 10,700 kPa. Gravimetric analysis indicated that swelling of ionic liquid gels (ILG) is dependent on the relative humidity of the atmosphere, while under identical environmental conditions traditional ballistic gelatin collapses. Overall, ILG physical property characterization results demonstrated a strong dependence on the concentration of [EMIM][EtSO4] and the cross-linker to mono-functional monomer mole fraction ratio. Moreover, ILG display potential to mimic soft tissue as well as other vital parts of the human body.

Original languageEnglish (US)
JournalInternational SAMPE Symposium and Exhibition (Proceedings)
StatePublished - 2008
Externally publishedYes
EventSAMPE 2008 - 52nd International SAMPE Symposium - Material and Process Innovations: Changing our World - Long Beach, CA, United States
Duration: May 18 2008May 22 2008

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering


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