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First day at Queensland University of Technology (QUT)

17 February 2020

First day at QUT campus

Light processable hydrogels were successfully fabricated by utilizing maize starch as raw material. To render light processability, starch was gelatinized and methacrylated by simple reaction with methacrylic anhydride. The methacrylated starch was then evaluated for its photocuring reactivity and 3D printability by digital light processing (DLP). Hydrogels with good mechanical properties and biocompatibility were obtained by direct curing from aqueous solution containing lithium phenyl-2,4,6-trimethylbenzoylphosphinate (LAP) as photo-initiator. The properties of the hydrogels were tunable by simply changing the concentration of starch in water. Photo-rheology showed that the formulations with 10 or 15 wt% starch started curing immediately and reached G’ plateau after only 60 s, while it took 90 s for the 5 wt% formulation. The properties of the photocured hydrogels were further characterized by rheology, compressive tests, and swelling experiments. Increasing the starch content from 10 to 15 wt% increased the compressive stiffness from 13 to 20 kPa. This covers the stiffness of different body tissues giving promise for the use of the hydrogels in tissue engineering applications. Good cell viability with human fibroblast cells was confirmed for all three starch hydrogel formulations indicating no negative effects from the methacrylation or photo-crosslinking reaction. Finally, the light processability of methacrylated starch by digital light processing (DLP) 3D printing directly from aqueous solution was successfully demonstrated. Altogether the results are promising for future application of the hydrogels in tissue engineering and as cell carriers

11 October 2020

Light Processable Starch Hydrogels

politecnico di torino materials science

24 March 2020

Graduation day

Queensland University of Technology (QUT)

18 February 2020

Second day at QUT

After few days of stop-over in New York I am now ready for the conference in Monterey. Ready to follow all the talks about recent advanced in photopolymerization as well as to show our recent results in the field.

15 September 2019

Ready for Photopolymerization Fundamentals 2019

ationic photocurable systems show important advantages with respect to the use of the radical process. The use of bio-renewable monomers will make the cationic process greener. We have reported the synthesis of a series of vinyl ether ester oligomers using enzyme catalysis under solvent-free conditions. We have reported the synthesis of epoxy functionalized bio-renewable monomers as well, that can be applied in cationic photopolymerization. The cationic UV-curing process was efficient in obtaining crosslinked coatings with a wide range of thermo-mechanical properties. The final properties were analyzed based on the monomer chemical structure. Glass or carbon fibers epoxy composites was achieved for the very first time. We have demonstrated that the crosslinking reaction proceeds via a radical-induced cationic frontal polymerization (RICFP), where the UV-surface activation of cationic ring-opening polymerization is able to promote the heat front that will activate a thermal initiator in the deeper layers. Because of the very high velocity of the reaction, we could obtain quickly epoxy composites maintaining the good thermo-mechanical properties. By this way, thicker cationic photocured materials can be achieved.

19 September 2019

Update #3 from Photopolymerization Fundamentals 2019

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