Thermoplastic elastomers derived from menthide and tulipalin A.

Area of Science:

• Polymer Chemistry
• Materials Science
• Sustainable Chemistry

Background:

• Development of high-performance thermoplastic elastomers from renewable resources is crucial for sustainable materials.
• Plant-based monomers offer a viable alternative to petroleum-based feedstocks in polymer synthesis.

Purpose of the Study:

• To synthesize novel ABA triblock copolymers using renewable monomers.
• To investigate the structure-property relationships of these bio-based copolymers.
• To evaluate their potential as high-performance thermoplastic elastomers.

Main Methods:

• Sequential polymerization utilizing ring-opening transesterification and atom transfer radical polymerization.
• Synthesis of poly(menthide) macroinitiator from menthide monomer.
• Polymerization of α-methylene-γ-butyrolactone (MBL) using the macroinitiator.
• Characterization using NMR spectroscopy, small-angle X-ray scattering, differential scanning calorimetry, and atomic force microscopy.
• Mechanical testing including tensile and elastic recovery experiments.

Main Results:

• Successfully synthesized four poly(α-methylene-γ-butyrolactone)-b-poly(menthide)-b-poly(α-methylene-γ-butyrolactone) (PMBL-PM-PMBL) triblock copolymers with varying PMBL content (6-20 wt %).
• Confirmed microphase separation in the synthesized copolymers through advanced characterization techniques.
• Demonstrated favorable tensile properties and elastic recovery at both ambient and elevated temperatures.

Conclusions:

• The synthesized renewable ABA triblock copolymers show potential as high-performance thermoplastic elastomers.
• The use of plant-based monomers provides a sustainable route to advanced polymer materials.
• These materials are suitable for applications requiring good mechanical performance under varying temperature conditions.