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Frontal Conversion and Uniformity in 3D Printing by Photopolymerisation

Vitale, Alessandra ; Cabral, João T

Materials, 2016-09, Vol.9 (9), p.760-760 [Periódico revisado por pares]

Switzerland: MDPI AG

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  • Título:
    Frontal Conversion and Uniformity in 3D Printing by Photopolymerisation
  • Autor: Vitale, Alessandra ; Cabral, João T
  • Assuntos: 3D printing ; Conversion ; conversion profile ; Displacement ; Inhomogeneity ; Mathematical models ; Patterning ; photopolymerisation ; photopolymerisation model ; Polymerization ; Shrinkage ; UV curing
  • É parte de: Materials, 2016-09, Vol.9 (9), p.760-760
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: We investigate the impact of the non-uniform spatio-temporal conversion, intrinsic to photopolymerisation, in the context of light-driven 3D printing of polymers. The polymerisation kinetics of a series of model acrylate and thiol-ene systems, both neat and doped with a light-absorbing dye, is investigated experimentally and analysed according to a descriptive coarse-grained model for photopolymerisation. In particular, we focus on the relative kinetics of polymerisation with those of 3D printing, by comparing the evolution of the position of the conversion profile ( ) to the sequential displacement of the object stage ( ). After quantifying the characteristic sigmoidal monomer-to-polymer conversion of the various systems, with a combination of patterning experiments, FT-IR mapping, and modelling, we compute representative regimes for which is smaller, commensurate with, or larger than . While non-monotonic conversion can be detrimental to 3D printing, for instance in causing differential shrinkage of inhomogeneity in material properties, we identify opportunities for facile fabrication of modulated materials in the -direction (i.e., along the illuminated axis). Our simple framework and model, based on directly measured parameters, can thus be employed in photopolymerisation-based 3D printing, both in process optimisation and in the precise design of complex, internally stratified materials by coupling the -stage displacement and frontal polymerisation kinetics.
  • Editor: Switzerland: MDPI AG
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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