1,3-Pentadiene-Assistant Living Anionic Terpolymerization: Composition Impact on Kinetics and Microstructure Sequence...

Area of Science:

• Polymer Chemistry
• Materials Science
• Organic Synthesis

Background:

• Living anionic polymerization enables precise control over polymer architecture.
• Alternating copolymerization strategies are crucial for designing functional polymers.
• Well-defined terpolymers with controlled sequences are challenging to synthesize.

Purpose of the Study:

• To prepare novel, well-defined poly(1,3-pentadiene-co-styrene-co-1,1-diphenylethylene) terpolymers.
• To investigate the kinetic and mechanistic aspects of the terpolymerization process.
• To characterize the microstructure and thermal properties of the synthesized terpolymers.

Main Methods:

• Living anionic polymerization combined with a unique alternating strategy.
• One-pot synthesis method for controlled molecular weight and narrow distributions.
• Kinetic analysis, Nuclear Magnetic Resonance (NMR), and Differential Scanning Calorimetry (DSC) for characterization.

Main Results:

• Successfully synthesized a wide composition range of polyolefin resins with controlled molecular weights and narrow distributions.
• Terpolymer yields and kinetics were dependent on feed ratio and alternating structure content.
• Glass transition temperature (Tg) was sensitive to composition, with some copolymers exhibiting two distinct Tg values and high Tg up to 140 °C.

Conclusions:

• A novel 'ABC-X' mechanism was proposed to explain the unique terpolymerization behavior.
• The study demonstrates a versatile method for creating precisely structured terpolymers.
• The synthesized resins possess tunable thermal properties suitable for advanced applications.