Characterization of cross-linked two-phase acrylic polymers.

Area of Science:

• Polymer Chemistry
• Materials Science

Background:

• Polymer networks are crucial in various material applications.
• Understanding network formation in particulate systems is key to controlling material properties.

Purpose of the Study:

• To investigate the formation of cross-linked networks within polymer particles.
• To characterize the properties of these networks using swelling measurements.

Main Methods:

• Controlled polymerization to allow monomer imbibition into particles.
• Extraction of non-cross-linked particulate phase.
• Volumetric measurements of equilibrium swelling for characterization.

Main Results:

• A cross-linked network was observed in the particulate phase of one material (L) due to slow polymerization and monomer imbibition.
• In materials CR and S, the particulate phase was extractable, leaving a characterized cross-linked matrix.
• Equilibrium swelling data were utilized to calculate the densities of elastically effective chains.

Conclusions:

• The rate of polymerization significantly influences cross-linked network formation within polymer particles.
• Equilibrium swelling is a viable method for estimating elastically effective chain densities in polymer networks.