Name: stereolithographic 3d printing with renewable acrylates
Uploaded: 2018-09-12T15:00:00
Description: Watch this Scientific Journal Video about Stereolithographic 3D Printing with Renewable Acrylates at JoVE.com

This study was supported by GreenPAC Polymer Application Centre as part of Project 140413: &#34;3D Printing in Production&#34;.&#160;We would like to acknowledge Albert Hartman, Corinne van Noordenne, Rens van Leeuwen, Anniek Bruins, Femke Tamminga, Jur van Dijken and Albert Woortman for facilitating the video shooting.

CAUTION: Please consult all relevant material safety data sheets (MSDS) before use.
1. Preparation of Photocurable Resin
NOTE: Please use personal protective equipment (safety glasses, gloves, lab coat) during the following procedure. See our previous work12 for more details on this section.
<ol>
	<li>Pour 50 g of 1,10-decanediol diacrylate (SA5201) in a 500 mL Erlenmeyer flask.</li>
	<li>Add 1.0 g of diphenyl(2,4,6-trimethylbenzoyl)phosphi...

<ol>
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C., Schwentenwein, M., Gorsche, C., Stampfl, J., Liska, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Toughening+of+photo-curable+polymer+networks:+A+review.">Toughening of photo-curable polymer networks: A review.</a> Polymer Chemistry. 7, 257-286 (2016).</li><li>Miao, S., Zhu, W., Castro, N. J., Nowicki, M., Zhou, X., Cui, H., Fisher, J. P., Zhang, L. G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=4D+printing+smart+biomedical+scaffolds+with+novel+soybean+oil+epoxidized+acrylate.">4D printing smart biomedical scaffolds with novel soybean oil epoxidized acrylate.</a> Scientific Reports. 6, 27226 (2016).</li><li>Voet, V. S. D., Strating, T., Schnelting, G. H. M., Dijkstra, P., Tietema, M., Xu, J., Woortman, A. J. 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C., Liska, R., Stampfl, J., Gurr, M., M&#252;lhaupt, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Polymers+for+3D+Printing+and+Customized+Additive+Manufacturing.">Polymers for 3D Printing and Customized Additive Manufacturing.</a> Chemical Reviews. 117, 10212-10290 (2017).</li><li>Weng, Z., Zhou, Y., Lin, W., Senthil, T., Wu, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Structure-property+relationship+of+nano+enhanced+stereolithography+resin+for+desktop+SLA+3D+printer.">Structure-property relationship of nano enhanced stereolithography resin for desktop SLA 3D printer.</a> Composites: Part A. 88, 234-242 (2016).</li><li>Scalera, F., Esposito Corcione, C., Montagna, F., Sannino, A., Maffezzoli, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Development+and+characterization+of+UV+curable+epoxy/hydroxyapatite+suspensions+for+stereolithography+applied+to+bone+tissue+engineering.">Development and characterization of UV curable epoxy/hydroxyapatite suspensions for stereolithography applied to bone tissue engineering.</a> Ceramics International. 40, 15455-15462 (2014).</li><li>Lee, H., Fang, N. 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(128), e56340 (2017).</li><li>Decker, C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Light-induced+crosslinking+polymerization.">Light-induced crosslinking polymerization.</a> Polymer International. 51, 1141-1150 (2002).</li><li>Elliot, J. E., Bowman, C. N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Predicting+network+formation+of+free+radical+polymerization+of+multifunctional+monomers.">Predicting network formation of free radical polymerization of multifunctional monomers.</a> Polymer Reaction Engineering. 10, 1-19 (2002).</li><li>Ellakwa, A., Cho, N., Lee, I. 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Additive manufacturing is applied in fabrication of tailor-made prototypes and small series, when the higher production costs per part can compete with conventional processes since there is no need for production of molds and tools. In the last decade, the revenues from services and products related to additive manufacturing have grown exponentially13. The largest fraction of material sales is from photopolymers. The growth attracted attention and initiated the investments of major industries, <em...

Rapid prototyping enables on-demand production and design freedom and allows the efficient manufacturing of 3D constructs in a layer-by-layer manner1. As a result, 3D printing as a fabrication technique has developed rapidly in recent years2. Various technologies are available, all relying on the translation of virtual models into physical objects, and applying processes such as extrusion, direct energy deposition, powder solidification, sheet lamination and photopolymerization. The latter involves stepwise UV curing of liquid photopolymer resins. In 1986, Hull and co-workers developed the stereolithography apparatus (SLA), a UV laser-based 3D printer. More recently, a similar process called digital light processing (DLP) has become available, in which photopolymerization is initiated by a light projector. Together, DLP and SLA are referred to as stereolithography 3D printing3.
SLA is applied in high-resolution prototyping and fabrication of biomedical devices4,5. This technology is superior to the widely used fused deposition modeling (FDM) in terms of accuracy, surface finishing and resolution6. Depending on the architecture of the product, a support structure is integrated in the 3D model to stabilize the construct during fabrication. Furthermore, a post-printing treatment of manufactured parts is required7,8. Typically, printed objects are washed in an alcohol bath to dissolve unreacted resin, and subsequent curing in an UV oven is performed to guarantee full conversion of the polymerization9.
In general, resins for lithography-based additive manufacturing rely on photocurable systems containing multifunctional acrylates or epoxides10. Current photopolymer resins on the commercial market are fossil-based and expensive, while the availability of low-cost renewable resins is needed to facilitate waste-free and local manufacturing of sustainable 3D products for a biobased economy1,6. Recently, photopolymer resins based on renewable acrylates were developed and successfully applied in stereolithography 3D printing11,12. In this detailed protocol, we demonstrate the rapid prototyping with biobased resins on a commercial stereolithography apparatus. Special attention is paid to critical steps in the procedure, i.e., resin formulation and post-printing treatments, to help new practitioners in the field of additive manufacturing.

<table>
	<tbody>
		<tr>
			<td>Isobornyl acrylate&#160;</td>
			<td>Sartomer</td>
			<td>SA5102</td>
			<td>Acrylate monomer</td>
		</tr>
		<tr>
			<td>1,10-decanediol diacrylate</td>
			<td>Sartomer</td>
			<td>SA5201</td>
			<td>Acrylate monomer</td>
		</tr>
		<tr>
			<td>Pentaerythritol tetraacrylate</td>
			<td>Sartomer</td>
			<td>SA5400</td>
			<td>Acrylate monomer</td>
		</tr>
		<tr>
			<td>Multifunctional epoxy acrylate</td>
			<td>Sartomer</td>
			<td>SA7101</td>
			<td>Acrylate oligomer</td>
		</tr>
		<tr>
			<td>Diphenyl(2,4,6-trimethylbenzoyl) phosphine oxide (TPO), 97%</td>
			<td>Sigma Aldrich</td>
			<td>415952</td>
			<td>Photoinitiator</td>
		</tr>
		<tr>
			<td>2,5-bis(5-tert-butyl-benzoxazol-2-yl)thiophene (BBOT), 99%</td>
			<td>Sigma Aldrich</td>
			<td>223999</td>
			<td>Optical absorber</td>
		</tr>
		<tr>
			<td>Isopropyl alcohol (IPA), 99%</td>
			<td>Bleko</td>
			<td>1010500</td>
			<td>For alcohol bath (applied in Form Wash)</td>
		</tr>
		<tr>
			<td>Paar Physica MCR300&#160;</td>
			<td>Anton Paar</td>
			<td>-</td>
			<td>Rheometer with parallel plate geometry</td>
		</tr>
		<tr>
			<td>Form 2 Printer</td>
			<td>Formlabs</td>
			<td>-</td>
			<td>Desktop SLA 3D printer</td>
		</tr>
		<tr>
			<td>Form Wash&#160;</td>
			<td>Formlabs</td>
			<td>-</td>
			<td>Washing station</td>
		</tr>
		<tr>
			<td>Form Cure</td>
			<td>Formlabs</td>
			<td>-</td>
			<td>UV oven</td>
		</tr>
		<tr>
			<td>Instron 4301 1KN Series IX</td>
			<td>Instron</td>
			<td>-</td>
			<td>Universal testing machine</td>
		</tr>
		<tr>
			<td>Philips XL30 ESEM-FEG&#160;</td>
			<td>Philips</td>
			<td>-</td>
			<td>Scanning electron microscope</td>
		</tr>
	</tbody>
</table>

stereolithographic 3d printing with renewable acrylates

The accessibility of cost-competitive renewable materials and their application in additive manufacturing is essential for an efficient biobased economy. We demonstrate the rapid prototyping of sustainable resins using a stereolithographic 3D printer. Resin formulation takes place by straightforward mixing of biobased acrylate monomers and oligomers with a photoinitiatior and optical absorber. Resin viscosity is controlled by the monomer to oligomer ratio and is determined as a function of shear rate by a rheometer with parallel plate geometry. A stereolithographic apparatus charged with the biobased resins is employed to produce complex shaped prototypes with high accuracy. The products require a post-treatment, including alcohol rinsing and UV irradiation, to ensure complete curing. The high feature resolution and excellent surface finishing of the prototypes is revealed by scanning electron microscopy.

Four representative resin compositions are displayed in Table 1, along with their average biobased carbon content (BC) derived from the individual BC of the components. The resin viscosity (Figure 1) is influenced by the ratio of acrylate monomers and oligomers and typically demonstrates Newtonian behavior. The mechanical properties of parts manufactured from various resins were determined by stress-strain analysis. Figur...

Watch this Scientific Journal Video about Stereolithographic 3D Printing with Renewable Acrylates at JoVE.com

Stereolithographic 3D Printing with Renewable Acrylates (Video) | JoVE

A protocol for additive manufacturing with renewable photopolymer resins on a stereolithography apparatus is presented.

Stereolithographic 3D Printing with Renewable Acrylates

The accessibility of cost-competitive renewable materials and their application in additive manufacturing is essential for an efficient biobased economy. ...

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