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Reversible Joining Technology for Polyolefins Using Electromagnetic Energy and Homologous Hot-Melt Adhesives
Romeo Cristian Ciobanu1, Mihaela Aradoaei1, George Andrei Ursan1
1Department of Electrical Measurements and Materials, Gheorghe Asachi Technical University, Bdul. D. Mangeron 71, 700050 Iasi, Romania.
Polymers
|January 28, 2026
Summary
This study developed novel hot-melt adhesives with metallic and ferrite additives for reversible polyolefin bonding using electromagnetic energy. The research confirmed the feasibility of this technology, optimizing parameters for efficient and cost-effective bonding of similar and dissimilar polyolefins.
Area of Science:
- Materials Science: Development of advanced polymer composites.
- Adhesion Science: Investigating reversible bonding mechanisms.
- Electromagnetics: Application of electromagnetic energy for material processing.
Background:
- Traditional polyolefin bonding methods can be time-consuming and energy-intensive.
- There is a need for efficient, reversible bonding techniques for polyolefins.
- Metallic and ferrite additives offer potential for electromagnetic energy absorption and localized heating.
Purpose of the Study:
- To develop and test hot-melt adhesives incorporating metallic (Al, Fe) and ferrite additives for reversible polyolefin bonding.
- To evaluate the influence of different additives on adhesive properties, dispersion, and water absorption.
- To determine the optimal conditions for bonding similar and dissimilar polyolefins using electromagnetic energy.
Main Methods:
- Synthesis of hot-melt adhesives with varying Al, Fe, and ferrite nanopowder content.
- Characterization of particle dispersion, water absorption, and dielectric properties.
- Reversible bonding experiments using 2.45 GHz electromagnetic energy on polyolefin samples.
- Mechanical testing (tensile strength, elongation) of bonded joints.
Main Results:
- Uniform dispersion was achieved with Al and ferrite additives; Fe nanopowders showed agglomeration.
- Composites with Al exhibited higher water absorption, while ferrite composites showed lower swelling.
- A significant shift in dielectric loss factor with temperature was observed, crucial for thermal activation.
- Successful reversible bonding of similar polyolefins was demonstrated, with specific formulations optimized for HDPE and PP.
- Bonding dissimilar polyolefins was effective only with Al-containing hot-melts.
- Optimal bonding conditions involved 850 × 103 W/kg power and a 1-minute exposure time for cost-effectiveness.
Conclusions:
- Hot-melt adhesives with metallic and ferrite additives are feasible for reversible polyolefin bonding via electromagnetic energy.
- Formulation choice (e.g., HDPE/Fe, PP/Al) impacts bonding efficiency for similar polyolefins.
- Al-containing adhesives are necessary for bonding dissimilar polyolefins, and optimized energy parameters enhance cost-effectiveness.
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