Transparent PC/PMMA Blends with Enhanced Mechanical Properties via Reactive Compounding of Functionalized Polymers.

Area of Science:

• Polymer Science and Engineering
• Materials Science
• Chemical Engineering

Background:

• Polycarbonate (PC) and polymethylmethacrylate (PMMA) are widely used polymers.
• Improving the mechanical properties and maintaining optical clarity of polymer blends is a significant challenge.
• Reactive compounding offers a pathway to create novel materials with tailored properties.

Purpose of the Study:

• To investigate the reactive compounding of functionalized PC and PMMA.
• To understand the formation of PC/PMMA copolymers and their impact on blend properties.
• To correlate molecular structure with macroscopic optical and mechanical performance.

Main Methods:

• Melt reaction of phenolic OH-functionalized PC with epoxy-functionalized PMMA.
• Spectroscopic analysis to confirm copolymer formation.
• Continuous twin-screw extrusion for reactive compounding.
• Evaluation of optical (transparency) and mechanical (tensile, flexural, scratch resistance) properties.

Main Results:

• Successful formation of a PC/PMMA copolymer during reactive compounding, confirmed spectroscopically.
• Transparent PC/PMMA blends with two-phase morphologies were produced.
• The blends exhibited synergistically improved tensile and flexural strength and high scratch resistance.
• Transparency was influenced by functionalization degree, catalyst presence, and residence time.

Conclusions:

• Reactive compounding of functionalized PC and PMMA yields transparent blends with superior mechanical performance.
• In-situ copolymer formation reduces interphase tension, enhances phase dispersion, and improves adhesion.
• The process enables the creation of advanced materials combining optical clarity and mechanical robustness.