A Mechanical Analysis of Chemically Stimulated Linear Shape Memory Polymer Actuation

Dumlu, Hakan; Marquardt, Axel; Zirdehi, Elias M.; Varnik, Fathollah; Shen, Yucen; Neuking, K.; Eggeler, Gunther

doi:10.3390/ma14030481

Cited by 11 publications

(13 citation statements)

References 63 publications

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“…The typical tan δ plot of C-FPAE showed two loss peaks at round 61 and 125 °C ( Figure S2 ). The two loss peaks are typical for polymers with different components [ 52 , 53 , 54 ]. The weak loss peak at 61 °C came from the incompletely cross-linked FPAE ingredients in the C-FPAE series.…”

Section: Resultsmentioning

confidence: 99%

Rosin-Based Epoxy Vitrimers with Dynamic Boronic Ester Bonds

Zeng

Liu

et al. 2021

Polymers

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Rosin is an abundantly available natural product. In this paper, for the first time, a rosin derivative is employed as the main monomer for preparation of epoxy vitrimers to improve the mechanical properties of vitrimers. Novel epoxy vitrimer networks with dynamic reversible covalent boronic ester bonds are constructed by a reaction between thiols in 2,2′–(1,4–phenylene)–bis (4–mercaptan–1,3,2–dioxaborolane) (BDB) as a curing agent and epoxy groups in the rosin derivative. The rosin-based epoxy vitrimer networks are fully characterized by Fourier transform infrared spectroscopy (FTIR), an equilibrium swelling experiment, and dynamic mechanical analysis (DMA). The obtained rosin-based epoxy vitrimers possess superior thermostability and good mechanical properties. Due to transesterification of boronic ester bonds, rosin epoxy vitrimer network topologies can be altered, giving welding, recycle, self-healing, and shape memory abilities to the fabricated polymer. Besides, the effects of treating time and temperature on welding capability is investigated, and it is found that the welding efficiency of the 20% C-FPAE sample is >93% after treatment for 12 h at 160 °C. Moreover, through a hot press, the pulverized samples of 20% C-FPAE can be reshaped several times and most mechanical properties are restored after reprocessing at 200 °C for 60 min. Finally, chemical degradation is researched for the rosin-based epoxy vitrimers.

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Section: Resultsmentioning

confidence: 99%

Rosin-Based Epoxy Vitrimers with Dynamic Boronic Ester Bonds

Zeng

Liu

et al. 2021

Polymers

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“…After the solvent volatilized, the original chemical structure of polymer was restored, which was shown as shape restoration in macro. [ 43 ] The difference of shape memory effect caused by different solvents was related to the permeability of solvents and the strength of hydrogen bonds formed. The presence of polar and non‐polar bonds in acetone and ethanol made it easy to interact with the polymer.…”

Section: Resultsmentioning

confidence: 99%

Biosynthetic Plastics as Tunable Elastic and Visible Stent with Shape‐Memory to Treat Biliary Stricture

et al. 2023

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Common biliary tract is ≈4 mm in diameter to deliver bile from liver to small intestine to help digestion. The abnormal narrowing leads to severe symptoms such as pain and nausea. Stents are an effective treatment. Compared with non‐degradable stents which require repeated removal, biodegradable stents have the advantage of reducing secondary injury related to endoscopic operation and patient burden. However, current biodegradable materials may cause tissue hyperplasia and the treatment method does not target etiology of stricture. So recurrence rates after biodegradable stent implantation are still high. Here, a biodegradable helical stent fabricated from biosynthetic P(3HB‐co‐4HB) is reported. Tunable properties can be acquired through altering culture substrates. Stent shows shape memory in various solvents. The stent has an optimized design with helical structure and outer track. The self‐expanding of helical structure and double drainage realized by outer track greatly improve drainage of bile. Importantly, stent‐loading triamcinolone acetonide can inhibit proliferation of fibroblasts and reduce incidence of restricture. Therapeutic effect is also demonstrated in minipigs with biliary stricture. The results of minipig experiments show that biliary duct in treatment group is unobstructed and tissue hyperplasia is effectively inhibited.

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“…Nonetheless, most of the referred works do not characterize the recovery behavior of the material over time, and when this is the case, it is often the strain evolution that is monitored. Recent examples of this can be found in refs [24–26]. In ref.…”

Section: Introductionmentioning

confidence: 97%

“…In ref. [24], a comprehensive study on the effects of programming strain, end load and chemical environment, performed with a chemically stimulated linear SMP, is carried out; in refs [25,26] the authors studied the effect of some printing parameters and orientation of the applied stress, on the recovery behavior of cubes of PLA produced by FFF.…”

Section: Introductionmentioning

confidence: 99%

Shape memory polymers as actuators: Characterization of the relevant parameters under constrained recovery

Peixoto

Zille

Silva

et al. 2021

Polymer Engineering & Sci

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In this work, a shape memory polyurethane is characterized through constrained recovery experiments performed in a tensile testing equipment. The most relevant results obtained are those concerned with the stress released over time during the recovery stage, since they provide quantitative information that can be used in the design of actuators. For this sake, design guidelines are proposed based on the effect of: (i) the programming temperature; (ii) the deformation imposed during the programming stage; (iii) the recovery temperature; and (iv) the manufacturing process used to produce the samples tested (compression molding and Fused Filament Fabrication). The set of experiments performed with compression‐molded samples put in evidence a considerable variety of material responses: (i) the maximum released stress varied from 0.74 to 1.68 MPa; (ii) the time required to attain this stress varied from 47 to 600 s; and (iii) the stress was released as a peak value that relaxed rapidly, or, contrarily, had a lasting effect. Another relevant conclusion is that the 3D printing technique does not affect the shape memory behavior of the material. Having this in mind, the conclusions provided by the compression‐molded samples study can be extended to printed ones.

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A Mechanical Analysis of Chemically Stimulated Linear Shape Memory Polymer Actuation

Cited by 11 publications

References 63 publications

Rosin-Based Epoxy Vitrimers with Dynamic Boronic Ester Bonds

Rosin-Based Epoxy Vitrimers with Dynamic Boronic Ester Bonds

Biosynthetic Plastics as Tunable Elastic and Visible Stent with Shape‐Memory to Treat Biliary Stricture

Shape memory polymers as actuators: Characterization of the relevant parameters under constrained recovery

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