Preparation and Structural Characterization of New Photopolymerizable Transparent Aluminum-Phosphate Hybrid Materials as Resins for 3D Printing

Author(s)

Tayama, Gabriel Toshiaki ^[1] ; Santagneli, Silvia Helena ^[1] ; Eckert, Hellmut ^[2] ; Pawsey, Shane ^[3] ; Messaddeq, Younes ^{[1, 4]}

Affiliation

^[1] Sao Paulo State Univ UNESP, Chem Inst, BR-14800900 Araraquara, SP - Brazil

^[2] Univ Sao Paulo, Sao Carlos Inst Phys, BR-13566590 Sao Carlos, SP - Brazil

^[3] Bruker BioSpin Corp, Billerica, MA 01821 - USA

^[4] Univ Laval, Ctr Opt Photon & Laser COPL, Quebec City, PQ G1V 0A6 - Canada

• Document type: Journal article
• Source: Journal of Physical Chemistry C; v. 124, n. 46, p. 25621-25631, NOV 19 2020.
• Web of Science Citations: 0

Abstract

The use of a hybrid sol-gel route to prepare silicate hybrid materials and glasses through stereolithography and other photopolymerizable based additive manufacturing techniques has become a major topic. In this work, we present a new synthesis of 2-hydroxyethyl methacrylate/aluminum-phosphate hybrid materials with potential use on additive manufacturing through stereolithography (SLA). The unique sol-gel chemistry of phosphates and their strong reactivity toward metal alkoxide precursors pose special challenges toward stable sols with low solvent concentration. Here, we were able to control condensation reactions, avoiding precipitation, yielding clear and long shelf-life stable 2-hydroxyethyl methacrylate/aluminum-phosphate hybrid sols with different Al/(Al + P) ratios (from 0% up to 50%), which can be further photopolymerized, yielding transparent crack-free monolithic materials. A detailed structural study through multinuclear solid-state NMR and infrared spectroscopies showed a high polymerization degree with inorganic Al-y(PO4)(x)-like fragments acting as cross-linkers. These cross-linked structures are sensitive to the Al/(Al + P) ratio, and an increasing aluminum concentration results in a higher degree of inorganic condensation. The organic-inorganic structures are highly interconnected resulting in homogeneous materials. (AU)

• FAPESP's process: 18/24735-3 - The correlation between structure and properties as investigated by multinuclear solid state NMR in disordered materials
• Grantee: Silvia Helena Santagneli
• Support type: Regular Research Grants
• FAPESP's process: 15/22828-6 - Pushing the boundaries of optical fibers: from photonics to optogenetics and environmental monitoring
• Grantee: Younes Messaddeq
• Support type: Research Projects - SPEC Program
• FAPESP's process: 18/06426-3 - Development of coacervates for additive manafacturing/3D printing of photonic materials
• Grantee: Gabriel Toshiaki Tayama
• Support type: Scholarships in Brazil - Doctorate (Direct)