High temperature shape memory polyimide ionomer

Bai, Yongkang; Long, Minnan; Liu, Yuejun

doi:10.1002/app.43630

Cited by 15 publications

(8 citation statements)

References 30 publications

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“…Optically transparent PIs with high thermal resistance have drawn great attention due to their extensive applications as transparent flexible substrates of optoelectronic devices, such as image displays, organic photovoltaics, printing circuit boards, and touch panels [4]. High temperature-resistant transparent PIs with shape memory effect, which involve conversion into a temporary shape and restoration to the original shape under external stimuli, have potential in advanced adaptive optoelectronic and deployable aerospace structural applications [2,5,6,7,8,9,10,11,12,13,14,15,16,17,18]. However, the trade-off between good transparency and thermal stability of PI films remains challenging due to the contradiction between the two properties in many instances [4].…”

Section: Introductionmentioning

confidence: 99%

Transparent, High Glass-Transition Temperature, Shape Memory Hybrid Polyimides Based on Polyhedral Oligomeric Silsesquioxane

et al. 2019

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Optically transparent polyimides with excellent thermal stability and shape memory effect have potential applications in optoelectronic devices and aerospace industries. A series of optically transparent shape memory polyimide hybrid films are synthesized from 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) and 2,2′-bis-(trifluoromethyl)biphenyl-4,4′-diamine (TFMB) with various polyhedral oligomeric silsesquioxane (POSS) contents and then subjected to thermal imidization. The hybrid films show good optical transparency (>80% at 400 nm and >95% at 500 nm) with cutoff wavelengths ranging from 318 to 336 nm. Following the incorporation of the inorganic POSS structure, the hybrid films exhibit excellent thermal stability with glass transition temperature (Tg) ranging from 351 to 372 °C. The hybrid films possess the highest Tg compared with the previously-reported shape memory polymers. These findings show that POSS is successfully utilized to develop transparent polyimides with excellent thermal stability and shape memory effect.

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Section: Introductionmentioning

confidence: 99%

Transparent, High Glass-Transition Temperature, Shape Memory Hybrid Polyimides Based on Polyhedral Oligomeric Silsesquioxane

et al. 2019

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“…According to previous research [5,36], overall fracture surface of pure PLA is rough, which indicates plastic deformation. Figure 9a,b both show rough and well stretched surface (a large number of curled broken fibrils), indicating LDHs@PA-Cu(Ⅱ) can improve the flexibility of PLA matrix [37][38][39]. As shown in Figure 9c, LDHs@PA-Cu(Ⅱ) tightly combines with PLA matrix without visible interface gap.…”

Section: Thermal and Crystallization Properties Of Ldhs@pa-cu(ii)/pla Nanocompositesmentioning

confidence: 86%

Efficient Gas Barrier and Antibacterial Properties of Poly(lactic acid) Nanocomposites: Functionalization with Phytic Acid–Cu(II) Loaded Layered Clay

2020

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Poly(lactic acid) (PLA) represents one of the most promising and attractive bio-based polymers for green packaging. However, toughness, gas barrier and antibacterial properties of pure PLA films cannot compete with those of traditional petroleum-based active packaging plastics. To fill this gap, utilization of excellent chelating properties of phytic acid (PA), functionalized layered double hydroxides (LDHs@PA-Cu(II)) was firstly synthetized via facile deposition and chelation of one-step assembled PA-Cu(II) coordination compounds on the surface of layered clay. Furthermore, LDHs@PA-Cu(II)/PLA nanocomposites were prepared by blending LDHs@PA-Cu(II) and pure PLA via solution casting evaporation process. After adding only 1 wt % LDHs@PA-Cu(II), elongation at break and tensile strength increase by 53.0% and 18.9%, respectively, and the oxygen relative permeability decreases by 28.0%. Due to the strong interface interaction and heterogenous nucleation, the reinforcement effect of LDHs@PA-Cu(II) at low loadings is remarkable. Meanwhile, owing to the antibacterial activity of PA-Cu(II) coatings, the antibacterial rate (against Escherichia coli) of LDHs@PA-Cu(II) exceeds 99.99%. Furthermore, the corresponding LDHs@PA-Cu(II)/PLA nanocomposites also show outstanding antibacterial properties, which will be a promising candidate for active packaging application.

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“…Expanding on this pioneering work, other highly aromatic polymers have been shown to possess shape memory behavior after functionalization with ionic groups. 193 Alternatively, Hu and co-workers triggered shape memory in aromatic polyamides through Diels-Alder adducts as crosslinkers. 190 In general, the shape memory behavior occurred at elevated temperatures in the dissociative state.…”

Section: State Of the Artmentioning

confidence: 99%

Stimuli‐responsive mechanical properties in polymer glasses: challenges and opportunities for defense applications

Dennis

Savage

Mrozek

et al. 2020

Polymer International

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The potential utility that responsive glasses provide in the areas of aeronautics, protection and unmanned systems is reviewed in this article. The article focuses on two broad classes of stimuli, photo and thermal, to better illustrate the challenges and convey some of the potential in developing these materials for the often extreme operational environments of defense applications. Three response mechanisms are outlined to provide a range of mechanical behaviors on demand: (i) shape-changing functionalities which locally yield or soften the material to stimulate chain mobility; (ii) bond forming (or breaking) chemistries which increase (or decrease) the stiffness of the material; and (iii) energy absorbing groups which convert the incoming stimuli into a spatially controlled heating and result in a designed softening of the material. Overall, continuing to develop responsive polymer glasses that respond rapidly and efficiently under low energy inputs will be critical for future defense applications.

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High temperature shape memory polyimide ionomer

Cited by 15 publications

References 30 publications

Transparent, High Glass-Transition Temperature, Shape Memory Hybrid Polyimides Based on Polyhedral Oligomeric Silsesquioxane

Transparent, High Glass-Transition Temperature, Shape Memory Hybrid Polyimides Based on Polyhedral Oligomeric Silsesquioxane

Efficient Gas Barrier and Antibacterial Properties of Poly(lactic acid) Nanocomposites: Functionalization with Phytic Acid–Cu(II) Loaded Layered Clay

Stimuli‐responsive mechanical properties in polymer glasses: challenges and opportunities for defense applications

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