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a Photographs of 3D printed structures using recycled resin. Scale bar 1 cm. b FTIR spectra of the 1st recycled PSU material (blue) and recycled thiol terminated resin (green). c 1 H-NMR spectra of <t>PPG-di-IPDI</t> <t>2000</t> (green), triSH (blue) and recycled thiol terminated oligomer resin (orange). Proton assignment according to the idealized structure of the recycled thiol terminated oligomer. d Dynamic mechanical analysis of pristine (blue), 1 st recycled (green) and 2 nd recycled (orange) PSU thermosets. Storage modulus is shown as a line and tan delta using hollow squares.
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polypropylene glycol (ppg) (mn: 2000 g/mol)  (Millipore)
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a Photographs of 3D printed structures using recycled resin. Scale bar 1 cm. b FTIR spectra of the 1st recycled PSU material (blue) and recycled thiol terminated resin (green). c 1 H-NMR spectra of <t>PPG-di-IPDI</t> <t>2000</t> (green), triSH (blue) and recycled thiol terminated oligomer resin (orange). Proton assignment according to the idealized structure of the recycled thiol terminated oligomer. d Dynamic mechanical analysis of pristine (blue), 1 st recycled (green) and 2 nd recycled (orange) PSU thermosets. Storage modulus is shown as a line and tan delta using hollow squares.
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a Photographs of 3D printed structures using recycled resin. Scale bar 1 cm. b FTIR spectra of the 1st recycled PSU material (blue) and recycled thiol terminated resin (green). c 1 H-NMR spectra of PPG-di-IPDI 2000 (green), triSH (blue) and recycled thiol terminated oligomer resin (orange). Proton assignment according to the idealized structure of the recycled thiol terminated oligomer. d Dynamic mechanical analysis of pristine (blue), 1 st recycled (green) and 2 nd recycled (orange) PSU thermosets. Storage modulus is shown as a line and tan delta using hollow squares.

Journal: Nature Communications

Article Title: Recyclable photoresins for light-mediated additive manufacturing towards Loop 3D printing

doi: 10.1038/s41467-023-41267-w

Figure Lengend Snippet: a Photographs of 3D printed structures using recycled resin. Scale bar 1 cm. b FTIR spectra of the 1st recycled PSU material (blue) and recycled thiol terminated resin (green). c 1 H-NMR spectra of PPG-di-IPDI 2000 (green), triSH (blue) and recycled thiol terminated oligomer resin (orange). Proton assignment according to the idealized structure of the recycled thiol terminated oligomer. d Dynamic mechanical analysis of pristine (blue), 1 st recycled (green) and 2 nd recycled (orange) PSU thermosets. Storage modulus is shown as a line and tan delta using hollow squares.

Article Snippet: Hexamethylene diisocyanate (HDI) (≥98.0%), polyethylene glycol (PEG) (M n : 400 g/mol), polypropylene glycol (PPG) (M n : 2000 g/mol) and, (M n : 1000 g/mol) 1,5,7-triazabicyclo[4,4,0]dec-5-ene (TBD), trimethylpropane tris(3-mercaptopropionate) (triSH) (≥95.0%), and 1,1,3,3-tetramethylguanidine (TMG) (99.0%), were obtained from Sigma-Aldrich ( https://www.sigmaaldrich.com/ES/es ).

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