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Comparative Study of Vinyl Polymerization of Styrene-Based Polymers Using Free Radical and Ultrasound Initiation
Nur Syuhada Abas1, Nor Saadah Mohd Yusof1, Noordini M Salleh2
1Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia.
Free radical and ultrasound initiation methods show selective efficiency in polymer synthesis. Free radical polymerization successfully produced liquid crystalline polymers, while ultrasound initiation was effective for styrene, yielding higher molecular weights.
Area of Science:
- Polymer Chemistry
- Materials Science
Background:
- Investigating polymerization techniques is crucial for designing advanced materials.
- Liquid crystalline polymers (LCPs) offer unique properties for high-performance applications.
Purpose of the Study:
- To explore and compare the polymerization behavior of styrene and a liquid crystalline acrylate monomer using free radical and ultrasound initiation.
- To understand the method-dependent selective efficiency in polymerization kinetics and molecular architecture.
Main Methods:
- Free radical polymerization and ultrasound initiation were employed.
- Structural confirmation using 1H NMR, 13C NMR, and FTIR.
- Molecular weights (Mn) determined by 1H NMR.
- Polymer morphology analyzed by Polarized Optical Microscopy (POM).
Main Results:
- Ultrasound initiation yielded higher molecular weights and rapid conversion for styrene polymerization.
- Free radical polymerization achieved higher overall conversion for styrene over longer durations.
- Ultrasound initiation was ineffective for liquid crystalline acrylate polymers and copolymers.
- Free radical polymerization successfully synthesized liquid crystalline acrylate polymers and copolymers.
- Polymers exhibited excellent thermal stability, with 5% weight loss above 350°C.
- POM analysis revealed nematic mesophases in specific polymers.
Conclusions:
- Initiation strategy critically influences polymerization kinetics and polymer properties.
- Free radical polymerization is suitable for synthesizing liquid crystalline polymers.
- Ultrasound initiation is effective for styrene polymerization, offering rapid conversion.
- The synthesized polymers demonstrate high thermal stability, suitable for demanding applications.
- Findings provide insights for designing thermally robust LCP-based materials.
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