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Study of the adhesion strength on overmoulded plastic materials using the essential work of interfacial fracture (EWIF) concept

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Abstract

The influence of the overmoulding processing conditions (melt and mould temperatures, holding pressure and injection rate) on the adhesion strength between two polymers in a hard–soft part was studied. The used materials were thermoplastic vulcanized elastomer (TPV) and polypropylene (PP). The study of the adhesion strength was made by measuring the essential work of interfacial fracture (EWIF) concept using a single edge-notched tension (SENT) geometry. It was observed that, the data distribution was good since an adequate correlation between the total work of interfacial fracture and the ligament length was obtained. It was verified that, when the melt temperature, and in some cases, the mould temperature are increased, a higher adhesion strength is obtained. These parameters affect in higher degree the adhesion strength, since they may improve the interdiffusion and the wetting process of the PP substrate by the molten material (TPV), causing as a result a good contact between them. A little influence was observed in the case of the holding pressure and injection rate.

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Acknowledgements

Candal wishes to thank “Dirección de Desarrollo Profesoral” of the universidad simón bolívar (USB) and the fondo nacional de ciencia, tecnología e investigación (FONACIT) from Venezuela for the financial support for the trips to Barcelona, Spain, to work on her Ph.D. thesis at the universitat politècnica de catalunya (UPC). She specially would like to thank institutional relations of the Usb and UPC for exoneration of payment of her Ph.D. Authors would like to thank the “Decanato de Investigación y Desarrollo” from Universidad Simón Bolívar for generous funding through grant DID-GID-02. Also they thank the centre catala del plastic and the laboratory “e” (USB) for allowing them to use their facilities and equipments that made possible the development of this investigation.

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Authors and Affiliations

  1. Grupo de Polímeros USB, Departamento de Mecánica, Universidad Simón Bolívar, Apartado 89000, Caracas, 1080-A, Venezuela

    María V. Candal

  2. Centre Català del Plàstic, Universitat Politècnica de Catalunya, c/ Colom 114, 08222, Terrassa, Barcelona, Spain

    Antonio Gordillo & Orlando O. Santana

  3. Grupo de Polímeros USB, Departamento de Ciencia de los Materiales, Universidad Simón Bolívar, Apartado 89000, Caracas, 1080-A, Venezuela

    Johan J. Sánchez

Authors
  1. María V. Candal
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  2. Antonio Gordillo
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  3. Orlando O. Santana
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  4. Johan J. Sánchez
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Corresponding author

Correspondence to María V. Candal.

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Candal, M.V., Gordillo, A., Santana, O.O. et al. Study of the adhesion strength on overmoulded plastic materials using the essential work of interfacial fracture (EWIF) concept. J Mater Sci 43, 5052–5060 (2008). https://doi.org/10.1007/s10853-008-2667-1

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  • DOI: https://doi.org/10.1007/s10853-008-2667-1

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