Photoinitiator Selection and Concentration in Photopolymer Formulations towards Large-Format Additive Manufacturing.
BAPO
additive manufacturing
large format
large scale
photobleaching
photopolymer
Journal
Polymers
ISSN: 2073-4360
Titre abrégé: Polymers (Basel)
Pays: Switzerland
ID NLM: 101545357
Informations de publication
Date de publication:
01 Jul 2022
01 Jul 2022
Historique:
received:
28
04
2022
revised:
27
06
2022
accepted:
27
06
2022
entrez:
9
7
2022
pubmed:
10
7
2022
medline:
10
7
2022
Statut:
epublish
Résumé
Photopolymers are an attractive option for large-format additive manufacturing (LFAM), because they can be formulated from structural thermosets and cure rapidly in ambient conditions under low-energy ultraviolet light-emitting diode (UV LED) lamps. Photopolymer cure is strongly influenced by the depth penetration of UV light, which can be limited in the 2-4 mm layer thicknesses typical of LFAM. Photoinitiator (PI) systems that exhibit photobleaching have proven useful in thick-section cure applications, because they generate a photoinitiation wavefront, but this effect is time-dependent. This study investigates the light transmission and through-thickness cure behavior in (meth)acrylate photopolymer formulations with the photobleaching initiator bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide (BAPO). Utilizing an optical model developed by Kenning et al., lower concentrations (0.1 wt% to 0.5 wt%) of BAPO were predicted to yield rapid onset of photoinitiation. In situ cure measurements under continuous UV LED irradiation of 380 mW/cm
Identifiants
pubmed: 35808752
pii: polym14132708
doi: 10.3390/polym14132708
pmc: PMC9268840
pii:
doi:
Types de publication
Journal Article
Langues
eng
Subventions
Organisme : NIEHS NIH HHS
ID : P42 ES027723
Pays : United States
Organisme : Institute of Advanced Composites Manufacturing Innovation
ID : P42 ES027723-01A1
Organisme : Office of Energy Efficiency and Renewable Energy
ID : DE-EE0006926
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