7a , as the irradiation time increased, the conversion of the material gradually increased and eventually became greater than that of the UV-cured material, while the tensile strength of the material showed a trend of increasing and then slightly decreasing with increasing irradiation time, Fig. 7b shows a more detailed stress-strain profile.
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Upconversion particle-assisted NIR polymerization enables microdomain gradient photopolymerization at inter-particulate length scale.
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