Porpora, Giuseppe (2023) Experiments and Modelling of Solvent Sealing of Polymeric Films. [Tesi di dottorato]
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| Tipologia del documento: | Tesi di dottorato |
|---|---|
| Lingua: | English |
| Titolo: | Experiments and Modelling of Solvent Sealing of Polymeric Films |
| Autori: | Autore Email Porpora, Giuseppe giuseppe.porpora@unina.it |
| Data: | 10 Marzo 2023 |
| Numero di pagine: | 95 |
| Istituzione: | Università degli Studi di Napoli Federico II |
| Dipartimento: | Ingegneria Chimica, dei Materiali e della Produzione Industriale |
| Dottorato: | Ingegneria dei prodotti e dei processi industriali |
| Ciclo di dottorato: | 35 |
| Coordinatore del Corso di dottorato: | nome email D'Anna, Andrea anddanna@unina.it |
| Tutor: | nome email Greco, Francesco [non definito] Pastore, Raffaele [non definito] Gabriele, Andrea [non definito] |
| Data: | 10 Marzo 2023 |
| Numero di pagine: | 95 |
| Parole chiave: | Anomalous Diffusion, Wet Adhesion, Solvent Sealing |
| Settori scientifico-disciplinari del MIUR: | Area 02 - Scienze fisiche > FIS/03 - Fisica della materia Area 09 - Ingegneria industriale e dell'informazione > ING-IND/06 - Fluidodinamica Area 09 - Ingegneria industriale e dell'informazione > ING-IND/24 - Principi di ingegneria chimica |
| Depositato il: | 21 Mar 2023 10:04 |
| Ultima modifica: | 10 Apr 2025 12:44 |
| URI: | http://www.fedoa.unina.it/id/eprint/15086 |
Abstract
Sealing of polymeric films is a widespread process, exploited in several industrial and technological applications, ranging from aeronautics to large consumer goods and bio-medical devices. Thus, the study of polymer/polymer interfaces and local polymer dynamics is currently raising a great deal of interest. Among several approaches, a modern way to promote the welding of two polymeric films is the absorption of a liquid solvent at the polymer surface: the so-called solvent-sealing technique. According to this method, a given amount of solvent is applied on a given polymeric film and, then, the wet film and the dry companion are put in contact, also applying pressure to promote the joint formation. The objective of this Ph.D. project is to study the fundamentals of the solvent-sealing transformation, by investigating the nature of its two main steps: solvent diffusion and swelling of the film, and the adhesion process itself, laying the foundations for a predictive tool for the seal strength. The main target application is the sealing of Polyvinyl alcohol films for laundry detergent pods’ production, where water is used as a solvent. The thesis combines experimental, theoretical and numerical tasks. From an experimental perspective, solvent diffusion, film swelling and adhesion between polymer layers have been characterized for the system water-Polyvinyl alcohol by means of several techniques, including optical microscopy, optical coeherence tomography and peel tests. From the theoretical and numerical side, a new model for solvent diffusion in a deforming polymer matrix has been developed and numerically solved. We demonstrate that the model provides fully satisfactory predictions by validating its outcomes both with our own experimental results and with literature data.
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