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TPV: A New Insight on the Rubber Morphology and Mechanic/Elastic Properties.
Cindy Le Hel1, Véronique Bounor-Legaré1, Mathilde Catherin1
1Univ-Lyon, Université Claude Bernard Lyon 1, Ingénierie des Matériaux Polymères, CNRS, UMR 5223, 15 Bd Latarjet, 69622 Villeurbanne CEDEX, France.
Polymers
|October 14, 2020
Summary
Optimizing the elastomer (EPDM) to thermoplastic (PP) ratio in thermoplastic vulcanizates (TPVs) is key for material performance. Morphology and rubber concentration significantly impact compression set, with carbon black enhancing properties at low PP levels.
Area of Science:
- Materials Science
- Polymer Science
Background:
- Thermoplastic vulcanizates (TPVs) are crucial materials combining elastomer and thermoplastic properties.
- Achieving optimal dispersion of the elastomer phase within the thermoplastic matrix is essential for desired material characteristics.
Purpose of the Study:
- To investigate the impact of the ethylene propylene diene monomer (EPDM) to polypropylene (PP) ratio on TPV properties.
- To understand the relationship between TPV morphology and compression set behavior.
- To evaluate the effect of crosslinking chemistry and fillers on TPV performance.
Main Methods:
- Literature review to establish optimal rubber phase dispersion criteria.
- Analysis of compression set experiments to assess elasticity recovery.
- Investigation of crosslinking agent effects (DCP vs. phenolic resin).
- Study of carbon black filler addition and its localization.
Main Results:
- Maximal packing fraction of ~0.80 requires a broad domain size distribution for the dispersed rubber phase.
- Adequate crosslinking during melting is necessary for effective elastomeric phase dispersion.
- TPV morphology and rubber concentration are primary determinants of compression set.
- Carbon black improves mechanical properties at 20% PP concentration, localizing at the EPDM/PP interface with radical chemistry.
Conclusions:
- Material morphology and rubber concentration are critical factors controlling TPV compression set.
- The choice of crosslinking agent does not significantly affect elasticity recovery in TPVs.
- Carbon black acts as a compatibilizer at the EPDM/PP interface when using radical crosslinking chemistry, enhancing mechanical properties.
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