Gamma Irradiation Effect on Polymeric Chains of Epoxy Adhesive-Reference-Cited by-同舟云学术

Gamma Irradiation Effect on Polymeric Chains of Epoxy Adhesive

Published:2024-04-25 Issue:9 Volume:16 Page:1202
ISSN:2073-4360
Container-title:Polymers
language:en
Short-container-title:Polymers

Author:

Ferrante Carino¹²^ORCID,Lucchesi Leonardo³⁴^ORCID,Cemmi Alessia⁵^ORCID,Di Sarcina Ilaria⁵^ORCID,Scifo Jessica⁵,Verna Adriano⁵,Taschin Andrea⁶⁷,Senni Luca⁶⁸^ORCID,Beghini Marco⁴,Monelli Bernardo Disma⁴^ORCID,Raffaelli Fabrizio³

Affiliation:

1. CNR-SPIN, c/o Dip.to di Scienze Fisiche e Chimiche, Via Vetoio, 67010 L’Aquila, Italy

2. FSN-FISS-SNI Laboratory, ENEA, Via Anguillarese, 301, 00123 Rome, Italy

3. Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Pisa, Largo Bruno Pontecorvo 3, 56127 Pisa, Italy

4. Dipartimento di Ingegneria Civile e Industriale, Università di Pisa, Largo Lucio Lazzarino 1, 56122 Pisa, Italy

5. ENEA–Nuclear Department, NUC-IRAD-GAM Laboratory, Via Anguillarese 301, 00123 Rome, Italy

6. ENEA–Fusion Physics Division, Via E. Fermi, 45, 00044 Rome, Italy

7. Consiglio Nazionale delle Ricerche, Istituto Nazionale di Ottica, CNR-INO, Via Nello Carrara 1, 50019 Firenze, Italy

8. CNR–Institute for Applied Mathematics ‘Mauro Picone’ (IAC), Via dei Taurini, 19, 00185 Rome, Italy

Abstract

The study of materials for space exploration is one of the most interesting targets of international space agencies. An essential tool for realizing light junctions is epoxy adhesive (EA), which provides an elastic and robust material with a complex mesh of polymeric chains and crosslinks. In this work, a study of the structural and chemical modification of a commercial two-part flexible EA (3M™ Scotch-Weld™ EC-2216 B/A Gray), induced by 60Co gamma radiation, is presented. Combining different spectroscopic techniques, such as the spectroscopic Fourier transform infrared spectroscopy (FTIR), the THz time-domain spectroscopy (TDS), and the electron paramagnetic resonance (EPR), a characterization of the EA response in different regions of the electromagnetic spectrum is performed, providing valuable information about the structural and chemical properties of the polymers before and after irradiation. A simultaneous dissociation of polymeric chain and crosslinking formation is observed.The polymer is not subject to structural modification at an absorbed dose of 10 kGy, in which only transient free radicals are observed. Differently, between 100 and 500 kGy, a gradual chemical degradation of the samples is observed together with a broad and long-living EPR signal appearance. This study also provides a microscopic characterization of the material useful for the mechanism evaluation of system degradation.

Publisher

MDPI AG

Link

https://www.mdpi.com/2073-4360/16/9/1202/pdf

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