Recyclable and reprintable biobased photopolymers for digital light processing 3D printing

Zhu, Guoqiang; Zhang, Jinshuai; Huang, Jen‐How; Qiu, Yuhao; Liu, Meiting; Yu, Jinni; Liu, Chengguo; Shang, Qianqian; Hu, Yun; Hu, Lihong; Zhou, Yonghong

doi:10.1016/j.cej.2022.139401

Cited by 44 publications

(33 citation statements)

References 48 publications

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“…Even though toughness values are sporadically characterized in the thiol–ene photopolymerization literature and data is often incomplete, the toughest nonurethane rubbery thiol–ene networks in the literature have values of ≈10–50 MJ m –3 , ,− thus being comparable to the materials presented here. Furthermore, these materials are tougher and more extensible than the existing examples of 3D printed materials that have been degraded and repolymerized using DCB exchange − (see Table S9).…”

Section: Resultsmentioning

confidence: 99%

“…The chemical details, exchange mechanism, and stoichiometry of a particular DCB system can be tuned to access diverse behaviors ranging from full network relaxation for remolding, , interfacial reactions for self-healing, and backbone scission to revert to oligomers. , Even though several DCB systems have been incorporated in bulk photopolymers, they have been sparsely employed in DLP-based 3D printing to date. However, existing examples demonstrate the powerful ability of dynamic covalent chemistry to be used as a tool to modulate materials in time and space, including enhanced interlayer adhesion, postprinting modification, − and life cycle control. − …”

Section: Introductionmentioning

confidence: 99%

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Vat Photopolymerization Additive Manufacturing of Tough, Fully Recyclable Thermosets

Kuenstler

Hernandez

Trujillo-Lemon

et al. 2023

ACS Appl. Mater. Interfaces

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To advance the capabilities of additive manufacturing, novel resin formulations are needed that produce high-fidelity parts with desired mechanical properties that are also amenable to recycling. In this work, a thiol–ene-based system incorporating semicrystallinity and dynamic thioester bonds within polymer networks is presented. It is shown that these materials have ultimate toughness values >16 MJ cm–3, comparable to high-performance literature precedents. Significantly, the treatment of these networks with excess thiols facilitates thiol–thioester exchange that degrades polymerized networks into functional oligomers. These oligomers are shown to be amenable to repolymerization into constructs with varying thermomechanical properties, including elastomeric networks that recover their shape fully from >100% strain. Using a commercial stereolithographic printer, these resin formulations are printed into functional objects including both stiff (E ∼ 10–100 MPa) and soft (E ∼ 1–10 MPa) lattice structures. Finally, it is shown that the incorporation of both dynamic chemistry and crystallinity further enables advancement in the properties and characteristics of printed parts, including attributes such as self-healing and shape-memory.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Vat Photopolymerization Additive Manufacturing of Tough, Fully Recyclable Thermosets

Kuenstler

Hernandez

Trujillo-Lemon

et al. 2023

ACS Appl. Mater. Interfaces

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“…While some of the very popular soft materials in robotics [e.g., silicone rubber Ecoflex (Siegenthaler et al, 2012)] are biodegradable, others (e.g., acrylate-based photopolymer resins for 3D printing) can be toxic (Zhu et al, 2015) and not recyclable (van Bochove and Grijpma, 2019). Therefore, the development of new compliant materials that will satisfy sustainability criteria will often be necessary (Maines et al, 2021;Zhu et al, 2023). However, even after a thoughtful assessment of specific material sustainability, there is a risk that sustainability factors might hinder progress in the field, especially if more strict environmental policies will be adopted in the future, replacing and updating the existing ones (EU Parliament, 2006).…”

Section: Figurementioning

confidence: 99%

Early career scientists converse on the future of soft robotics

Tauber

Slesarenko²

2023

Front. Robot. AI

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During the recent decade, we have witnessed an extraordinary flourishing of soft robotics. Rekindled interest in soft robots is partially associated with the advances in manufacturing techniques that enable the fabrication of sophisticated multi-material robotic bodies with dimensions ranging across multiple length scales. In recent manuscripts, a reader might find peculiar-looking soft robots capable of grasping, walking, or swimming. However, the growth in publication numbers does not always reflect the real progress in the field since many manuscripts employ very similar ideas and just tweak soft body geometries. Therefore, we unreservedly agree with the sentiment that future research must move beyond “soft for soft’s sake.” Soft robotics is an undoubtedly fascinating field, but it requires a critical assessment of the limitations and challenges, enabling us to spotlight the areas and directions where soft robots will have the best leverage over their traditional counterparts. In this perspective paper, we discuss the current state of robotic research related to such important aspects as energy autonomy, electronic-free logic, and sustainability. The goal is to critically look at perspectives of soft robotics from two opposite points of view provided by early career researchers and highlight the most promising future direction, that is, in our opinion, the employment of soft robotic technologies for soft bio-inspired artificial organs.

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“…[80][81][82] 3D printing method based on the photopolymerization techniques has been a hot topic in recent years due to many advantages such as highest accuracy, high production efficiency, material utilization rate of nearly 100 % and mild facilities. [83][84] Therefore, photopolymerization 3D printing have received revitalized attentions in a variety of 3D printing such as stereolithography (SLA), [85] direct laser writing (DLW), [86] digital light processing (DLP), [87] ink jetting, [88] and real-time curing of DIW. [63,89] Several commercial UV-light-sensitive PIS such as TPO, BAPO, Irgacure 184, and Irgacure 369 were used for the 3D printing processes of photopolymerization under irradiation at UV light.…”

Section: D Printingmentioning

confidence: 99%

Introduction of Photopolymerization Technology and Application

Zang²,

Xin³

et al. 2023

Preprint

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Photopolymerization as an energy-saving and environment-friendly technology has been applied in many fields and developed continuously since the middle of the 20th century. Today, photopolymerization technology is ubiquitous in every aspect of our lives. This review starts from the principle of photopolymerization reaction, introduces the process of photopolymerization, initiation mechanism of photoinitiators and three kinds of polymerization methods according to the wavelength of irradiation source. Subsequently, review focuses on the application of photopolymerization technology in thiol-based click reaction, 3D printing, photoresist, hydrogels and other fields, so as to demonstrate its irreplaceable role in the present.

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Recyclable and reprintable biobased photopolymers for digital light processing 3D printing

Cited by 44 publications

References 48 publications

Vat Photopolymerization Additive Manufacturing of Tough, Fully Recyclable Thermosets

Vat Photopolymerization Additive Manufacturing of Tough, Fully Recyclable Thermosets

Early career scientists converse on the future of soft robotics

Introduction of Photopolymerization Technology and Application

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