Polymerization of acrylic bone cement using differential scanning calorimetry

Area of Science:

• Materials Science
• Polymer Chemistry
• Biomaterials Engineering

Background:

• Acrylic bone cements are widely used in orthopedic surgery for fixation.
• Understanding the polymerization kinetics is crucial for optimizing cement performance and patient outcomes.
• Tricalcium phosphate (TCP) is a common additive in bone cements, but its effect on polymerization needs further elucidation.

Purpose of the Study:

• To investigate the polymerization kinetics of acrylic bone cement using differential scanning calorimetry (DSC).
• To determine the order of the polymerization reaction and calculate reaction rate constants.
• To evaluate the effect of tricalcium phosphate (TCP) addition on the polymerization rate and thermal stability of bone cement.

Main Methods:

• Differential Scanning Calorimetry (DSC) was employed to monitor the polymerization reaction.
• Thermogravimetric Analysis (TGA) was used to assess thermal stability.
• Kinetic analysis was performed to determine reaction order and rate constants before and after peak polymerization time.

Main Results:

• The polymerization of acrylic bone cement followed an approximately first-order reaction.
• Two distinct reaction rate constants were identified, calculated before and after the peak reaction time.
• Increasing tricalcium phosphate (TCP) content significantly retarded the polymerization rate of the bone cement.

Conclusions:

• The polymerization kinetics of acrylic bone cement can be accurately described by a first-order reaction model.
• Tricalcium phosphate (TCP) acts as a significant retardant, slowing down the polymerization process.
• These findings provide valuable insights for tailoring bone cement formulations for improved handling and setting characteristics in orthopedic applications.