A novel UV-curable acryl-polyurethane for flexural 3D printing architectures

Lim, Won‐Bin; Bae, Ji‐Hong; Seo, M.K; Min, Jin‐Gyu; Lee, Ju-Hong; Kim, Sou Hyun; Jung, Young-Suk

doi:10.1016/j.addma.2022.102625

Cited by 6 publications

(2 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Acrylate polyurethanes and silicones can be developed to produce soft prepolymers that polymerize under light irradiation. [15,93,94] For instance, acrylate-PDMS has been 3D printed via DLP printing, [95,96] as shown in Figure 7. In the case of polyurethanes, this challenge can be addressed by synthesizing the material from fatty acids or blending it with low-molecular-weight polymers.…”

Section: Vp: Digital Light Processing and Stereolithographymentioning

confidence: 99%

Soft Mechanosensing via 3D Printing: A review

Cafiso

Lantean

Pirri

et al. 2023

Advanced Intelligent Systems

View full text Add to dashboard Cite

Soft robots are an emerging class of robots that, differently from their conventional and rigid counterparts, are able to perform precise and delicate tasks, e.g., they can comply with external surfaces through large deformation, squeeze and navigate in unknown and small spaces, recognize shapes and textures, grasp and move delicate objects, interact safely with humans. [1,2] They are made of "soft" materials, including any gel, colloid, foam, or polymer highly prone to deformation. The soft bodies of these innovative robots are inspired by living beings that can perform smooth actions and rapidly adapt to their surroundings.In this regard, an efficient soft robot must include sensors that provide the perception of the environment and of the robot itself. Mechanical sensors are used to convert the deformations caused by mechanical stimuli into an electrical signal, which can be exploited for the robot control to grant effective and safe interactions between the soft robot and the surrounding. Due to the importance of sensing deformations, scientists researched various materials and technologies to develop soft mechanical sensors, i.e., mechanical sensors made of soft materials. [3][4][5] Generally, soft sensors are fabricated via conventional manufacturing techniques such as casting, [6] tapering and pasting, and combining different parts (i.e., dielectricconductive, substrate-electrode, etc.) in a step-by-step procedure. However, the soproduced devices suffer from poor adhesion due to the lack of mechanical and/or chemical compatibility between the various elements; moreover, the fabrication processes are excessively laborious, time-consuming, and with intrinsic low reproducibility and scalability. 3D printing, or additive manufacturing (AM), is a key technology to overcome these issues and move towards a new class of reliable and scalable soft sensors. It is one of the most disruptive technologies of the last decades that enables the fabrication of complex shapes by adding sub-units of material starting from a digital model, [7] in contrast to conventional, subtractive technologies. Due to the intrinsic design freedom and the possibility of using deformable materials, AM allows the implementation of complex soft robotic designs, [8] reaching applications in several fields such as biomedical engineering, healthcare, food, fashion, automotive, aerospace, etc. [9][10][11][12][13][14] Besides the seamless fabrication procedure, AM guarantees the opportunity to build actual 3D geometries, unlike previous 2D and 2.5D fabrication technologies. [15,16] This aspect is crucial and opens technological possibilities such as: 1) inspiration from natural sensory receptors to guide new morphological designs, 2) enhancing the deformation of the bulk material by incorporating voids through lattice-like geometries, and 3) investigating designs that enhance deformations in specific directions. These new design principles can pave the way to develop soft mechanical sensors able to discriminate different types of mechanical stimuli...

show abstract

Section: Vp: Digital Light Processing and Stereolithographymentioning

confidence: 99%

Soft Mechanosensing via 3D Printing: A review

Cafiso

Lantean

Pirri

et al. 2023

Advanced Intelligent Systems

View full text Add to dashboard Cite

show abstract

“…Its peculiar 5E features (i.e., efficient, energy-saving, economical, enabling, and environmentally friendly) make it a green and popular technology. So far, it has been widely used in coating [ 5 , 6 ], ink [ 7 , 8 ], varnish [ 9 ], adhesive [ 10 ], 3D printing [ 11 ], functional materials [ 12 , 13 ], etc. Under UV irradiation, the curable system instantaneously forms a cross-linking network and turns from liquid to solid within a fraction of a second.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Structure of 2-Hydroxypropyl Methacrylate-Capped Isophorone Diisocyanate and Poly(Propylene Glycol) Urethane Mixtures and the Properties of their UV-Cured Co-Networks with Isobornyl Methacrylate

Zhou

Tang

2022

Materials

View full text Add to dashboard Cite

Polyurethane acrylate prepolymers with different contents of HIPIH and HIH were synthesized via reacting excessive isophorone diisocyanate (IPDI) with poly(propylene glycol) (PPG) and then end-capping with 2-hydroxypropyl methacrylate (HPMA) in isobornyl methacrylate (IBOMA). After the addition of the photoinitiator PI 1173, the resulting prepolymer resins were irradiated by UV light to form cured materials. The structures of the prepolymers were confirmed by 1H NMR, FT-IR, and GPC. SEM analyses proved that no obvious phase separation was observed within the cured sample. As the content of HIH increased, the viscosity of the prepolymers increased slightly. In addition, the gel content, solvent resistance, Shore hardness, Young’s modulus, and the tensile strength of the cured films increased, whereas the elongation at break decreased gradually. The volume shrinkage of the cured samples ranged between 4.5% and 4.8%. DMA analyses showed that the Tgs of the cured samples increased as more HIH structures existed. TGA analyses revealed that the cured samples had high thermal stability. This solvent-free fabrication process was simple, convenient, and controllable. By simply regulating the contents of HIPIH and HIH in the prepolymers, the performances of the cured materials could be adjusted to a wide range.

show abstract

Preparation and study of novel UV‐curable alkyd‐siloxane coating materials

Golubev,

Baranova,

Bazhanov

et al. 2024

J of Applied Polymer Sci

View full text Add to dashboard Cite

A material capable of curing due to UV irradiation based on an alkyd oligomer and oligoorganosilsesquioxanes (OOSs) with functional thiol groups was obtained. Using microinterferometry, it was shown that the alkyd oligomer and OOS are completely compatible (mutually soluble). The resulting alkyd‐siloxane composition was cured under the action of UV irradiation due to reaction between double bonds of alkyd oligomer and thiol‐groups of silsesquioxane oligomer. The curing reaction takes 5 min with formation of coating, containing 99% of gel fraction, which is in 30 times faster in comparison with the classical method of alkyd curing in the presence of siccatives. The hydrophobicity of alkyd‐siloxane coatings also increases and varies depending on the content of OOS. The introduction of 50% OOS into the alkyd oligomer makes it possible to increase the water contact angle by 10° relative to the coating based on pure alkyd. A similar dependence is observed when studying the thermal stability of coatings. Thus, even with the introduction of 10% OOS into alkyd oligomer, the temperature at which a loss of 50% of mass occurs increases by 24°C relative to coatings based on a pure alkyd oligomer.

show abstract

A novel UV-curable acryl-polyurethane for flexural 3D printing architectures

Cited by 6 publications

References 23 publications

Soft Mechanosensing via 3D Printing: A review

Soft Mechanosensing via 3D Printing: A review

Synthesis and Structure of 2-Hydroxypropyl Methacrylate-Capped Isophorone Diisocyanate and Poly(Propylene Glycol) Urethane Mixtures and the Properties of their UV-Cured Co-Networks with Isobornyl Methacrylate

Preparation and study of novel UV‐curable alkyd‐siloxane coating materials

Contact Info

Product

Resources

About