2021
DOI: 10.3390/polym13203473
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Improving UV Curing in Organosolv Lignin-Containing Photopolymers for Stereolithography by Reduction and Acylation

Abstract: Despite recent successes in incorporating lignin into photoactive resins, lignin photo-properties can be detrimental to its application in UV-curable photopolymers, especially in specialized engineered resins for use in stereolithography printing. We report on chemical modification techniques employed to reduce UV absorption by lignin and the resulting mechanical, thermal, and cure properties of these modified lignin materials. Lignin was modified using reduction and acylation reactions and incorporated into a… Show more

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Cited by 16 publications
(22 citation statements)
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“…For lignin contents ≤2 wt.% the critical exposure ( E c ) to induce polymerization remains actually unchanged, whereas it doubles its value for 3 wt.% lignin. Notwithstanding, the E c values are in the same range or lower compared to those reported for commercial nonconductive resins [ 25 , 28 , 36 ]. The D p of LG1 (58 µm) lies within the low range of commercial resins without conductive fillers tested by Bennet et al (53–568 µm), whereas D p values decreased around 31% for 2 and 3 wt.% lignin contents [ 36 ].…”
Section: Resultsmentioning
confidence: 60%
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“…For lignin contents ≤2 wt.% the critical exposure ( E c ) to induce polymerization remains actually unchanged, whereas it doubles its value for 3 wt.% lignin. Notwithstanding, the E c values are in the same range or lower compared to those reported for commercial nonconductive resins [ 25 , 28 , 36 ]. The D p of LG1 (58 µm) lies within the low range of commercial resins without conductive fillers tested by Bennet et al (53–568 µm), whereas D p values decreased around 31% for 2 and 3 wt.% lignin contents [ 36 ].…”
Section: Resultsmentioning
confidence: 60%
“…The viscosity values of all liquid formulations as a function of shear rate and Lignin amount at room temperature are depicted in Figure S1 , whereas the viscosities at 1 s −1 are compiled in Table 1 . It is obvious that the higher the lignin content, the greater the viscosity of the formulations at 1 s −1 , since the presence of lignin limits the mobility of the polymer chains [ 25 , 35 ]. Increased lignin content (0–4 wt.…”
Section: Resultsmentioning
confidence: 99%
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“…The polymer gear has some distinct advantages compared to the metal gear, including low weight, quietness of operation, and no need for external lubrication [ 1 ], and has been widely used in the automotive industry and consumer electronics. Additive manufacturing (AM) [ 2 , 3 ] has been defined as the process of building physical models by joining materials layer upon layer using computer numerical control data. The application of AM processes has increased in fabricating physical models across various industries because of its capability in manufacturing functional parts with complex geometries.…”
Section: Introductionmentioning
confidence: 99%