New Developments in Acrylate Oligomers for 3D Printing

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The expansion of 3D printing into rapid manufacturing applications and strong market demand for next-generation oligomers has been coupled with an increased demand for materials with a wide variety of physical properties. Rigid materials, with high tensile strength and low elongation, are readily available, but offerings of tough, flexible materials with high elongation are more limited.

Aside from the technical challenges of developing these types of materials, another potential source driving this limitation is the challenge associated with printing flexible parts with certain types of 3D printers.1 When the printing process involves movement of parts or printer hardware in the x or y direction, as it does with some SLA or DLP type printers, forces are exerted on the part in situ that could cause an overly flexible part to move out of alignment, separate from the build platform, or even break resulting in poor resolution and failed prints. Thus, in the development of new materials for 3D printing, especially flexible ones, it becomes important to evaluate how well the material can withstand these types of forces.

In a new study, and resulting white paper, the benefits of new oligomers are investigated in free-radical curing acrylate formulations and free radical/cationic curing acrylate/epoxy hybrid formulations. In addition, the mechanical and thermal properties of the formulations are revealed.

The purpose of this study had two major goals. The first was to evaluate the mechanical properties of newly developed (meth)acrylate oligomers that have the potential to meet the demand for tough, flexible 3D printing materials. This evaluation included a comparison to materials currently on the market that are advertised as being tough or flexible.

The second goal was to identify a method that would allow for an evaluation of the oligomers’ ability to resist the forces that act upon parts during the printing process. This resistance, in turn, relates to printability or the probability of having a successful printing outcome. For this latter goal, both relative rate of (meth)acrylate conversion and the change in the material’s complex modulus during cure were examined. These methods were used to evaluate how quickly the material’s green state properties were reached and whether those properties would meet a minimum threshold required to survive the printing process.

For this work, four urethane (meth)acrylate oligomers (UAO) of varying structures were synthesized to explore their suitability for use in 3D printing formulations, especially those designed to generate flexible shapes or parts. The oligomers were synthesized in 35-40% reactive diluent to produce a preformulated resin mixture and then further formulated into the model 3D printing formula found in Table 1 below.

Table 1.

Component Wt%
UAO 55.0
Reactive Monomers 40.0
Photoinitiator 3.0
Additives 2.0

Table 1: Model 3D Printing Formula

Three commercially available (meth)acrylate based 3D printing resins (CR) were also examined for comparative purposes and were used as received. The viscosity of all resin formulations was measured using a Brookfield CAP2000+ viscometer at 25⁰C.  Download the new white paper to see the full results of this study!

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James Aerykssen and Josiah Piceno of Dymax discuss new developments in acrylate oligomers for 3D printing. 

 

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