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Synthesis of Free-solvent Liquid Ethylene Propylene Diene Monomer Based on the Efficiently Cycling Between V3+ and V2+of VOCl3 Catalysts
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DOI：10.11777/j.issn1000-3304.2025.25185.png)
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Abstract
En 中文
Liquid ethylene propylene diene monomer (EPDM) possesses the characteristics of solid EPDM and exhibits good fluidity, making it suitable for applications such as anti-corrosion and anti-fouling coatings, plasticizers, lubricants, and adhesives. However, its synthesis process faces numerous challenges, including difficulties in molecular weight control, low synthesis efficiency, and high metal residue. In this study, a solvent-free liquid EPDM which exhibited excellent fluidity and thermal stability was synthesized by using VOCI, catalysts. The viscosity of liquid EPDM ranged from 2469 mPa-s to 3546 mPa-s at 25 degrees C. The molecular weight of the polymer was as low as 4960 g/mol. The obtained polymer showed good thermal stability, with the maximum thermal weight loss temperature approximately 405 degrees C. The interactions among co-catalyst (Al2EtCl3. EASC), activator (ethyl trichloroacetate, ETCA), and VOCl, during the polymerization reaction were explored, and the impact of side reactions on the polymerization results was investigated. By adopting an add a small amount multiple times strategy for ETCA, the side reactions between ETCA and EASC were reduced, continuously establishing a cycle of V & sup3;(+) and V2+. This gives an increase in the polymer yield from 2.93 g/g(cat )to 31.26 g/g(cat)- This study avoids the drawbacks of using high-concentration catalysts in conventional liquid rubber synthesis.
Keywords:
Liquid rubber
Polymerization
Ethylene propylene diene monomer
VOCI3
Journal
A
IF:
1.3
Papers:
180
Citations:
1.2K
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Cited Papers