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Synthesis and characterization of functionally gradient materials obtained by frontal polymerization

Nuvoli, Daniele and Alzari, Valeria and Pojman, John A. and Sanna, Vanna Annunziata and Ruiu, Andrea and Sanna, Davide and Malucelli, Giulio and Mariani, Alberto (2015) Synthesis and characterization of functionally gradient materials obtained by frontal polymerization. ACS Applied Materials and Interfaces, Vol. 7 (6), p. 3600-3606. ISSN 1520-4898. eISSN 1944-8252. Article.

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DOI: 10.1021/am507725k

Abstract

Functionally gradient materials (FGMs) with gradual and continuous changes of their properties in one or more dimensions are useful in a wide range of applications. However, obtaining such materials with accurate control of the gradient, especially when the gradient is nonlinear, is not easy. In this work, frontal polymerization (FP) was exploited to synthesize polymeric FGMs. We demonstrated that the use of ascending FP with continuous feeding of monomers with computer-controlled peristaltic pumps provided an excellent method for the preparation of functionally gradient materials with programmed gradients. To test the effectiveness of the method, copolymers made from triethylene glycol dimethacrylate/hexyl methacrylate with linear and hyperbolic gradient in composition were synthesized. Differential scanning calorimetry (DSC), Shore A hardness measurements, compression tests, and swelling studies were performed along the length of the materials to assess the relationship between the gradients and the material properties. Glass transition temperatures, determined by DSC, showed a linear dependence on the composition and were in agreement with theoretical values. The other properties showed different and specific behaviors as a function of the compositional gradient.

Item Type:Article
ID Code:10788
Status:Published
Refereed:Yes
Uncontrolled Keywords:Functionally gradient material, frontal polymerization, mechanical properties, glass transition temperature, swelling ratio, shore A hardness, copolymer, polyacrylate
Subjects:Area 03 - Scienze chimiche > CHIM/04 Chimica industriale
Divisions:002 Altri enti e centri di ricerca del Nord Sardegna > INSTM-Consorzio Interuniversitario Nazionale per la Scienza e la Tecnologia dei Materiali, Unità di ricerca di Sassari
001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Chimica e Farmacia
Publisher:American Chemical Society
ISSN:1520-4898
eISSN:1944-8252
Deposited On:10 Feb 2015 14:41

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