Abstract:Shape memory polymers (SMPs) are stimuli responsive materials with programmable recovery from a deformed state. SMP behavior is often impacted by manufacturing features like layering that can impart anisotropic responses....
“…Another prospective strategy involves introducing a pot-life stabilizer ( e.g. , aluminum salt of N -nitroso- N -phenylhydroxylamine (ANPHA) 50,51 ) into the formulations, thereby augmenting their stability at elevated temperatures over time.…”
Section: Resultsmentioning
confidence: 99%
“…One potential approach involves developing the complete mixture and incorporating the crosslinker (i.e., thiol) prior to the printing process. Another prospective strategy involves introducing a pot-life stabilizer (e.g., aluminum salt of N-nitroso-N-phenylhydroxylamine (ANPHA) 50,51 ) into the formulations, thereby augmenting their stability at elevated temperatures over time.…”
Thiol–ene photo-crosslinked poly-ε-caprolactone networks, exhibiting varying network architectures, were employed to fine-tune physico-chemical characteristics, while simultaneously exploring their potential application in digital light processing.
“…Another prospective strategy involves introducing a pot-life stabilizer ( e.g. , aluminum salt of N -nitroso- N -phenylhydroxylamine (ANPHA) 50,51 ) into the formulations, thereby augmenting their stability at elevated temperatures over time.…”
Section: Resultsmentioning
confidence: 99%
“…One potential approach involves developing the complete mixture and incorporating the crosslinker (i.e., thiol) prior to the printing process. Another prospective strategy involves introducing a pot-life stabilizer (e.g., aluminum salt of N-nitroso-N-phenylhydroxylamine (ANPHA) 50,51 ) into the formulations, thereby augmenting their stability at elevated temperatures over time.…”
Thiol–ene photo-crosslinked poly-ε-caprolactone networks, exhibiting varying network architectures, were employed to fine-tune physico-chemical characteristics, while simultaneously exploring their potential application in digital light processing.
“…Thiol-ene photopolymers have emerged as a robust platform to fabricate coatings, biomaterials, and polymers for stereolithographic 3D printing. 10,26,29 First, we prepared DAPH with a tetrafunctional thiol, pentaerythritol tetra(3-mercaptopropionate) (PETMP), with a stoichiometric amount of thiol and alkene groups (Fig. 4A).…”
Epoxy-based polymer networks from step-growth polymerizations are ubiquitous in coatings, adhesives, and as matrices in composite materials. Dynamic covalent bonds in the network allow its degradation into small molecules and...
“… 46 Expanding on this initial work, Schwartz and co-workers found the thiol-ene photoresins produce printed structures with stimuli-responsive shape-memory behavior. 47 Ultimately, coupling the wider range of chemical synthetic freedom, network uniformity, oxygen insensitivity, and reduced shrinkage of step-growth polymerizations, researchers have begun to target step-growth polymerization systems for expansion of VP chemistries. Scheme 4 Photo-mediated step-growth polymerization of difunctional thiol-ene monomers.…”
Section: Vp Printing and Photopolymerizationmentioning
Three-dimensional printing, or additive manufacturing (AM), is a broad term for a wide range of fabrication methods utilizing materials such as small-molecule, polymer, and metal feedstocks. Each method requires different chemical, physical, and engineering needs to be successful. This article will discuss some of the considerations for polymer-based AM methods. Ultimately, we focus on the chemistries of vat photopolymerization, in which light is used to cure a resin from liquid to solid, to provide an example of how chemical advancements have led to increased speed, resolution, and multimaterial printing capabilities not previously possible.
Graphical abstract
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