Shape memory effect for recovering surface damages on polymer substrates

García-Huete, Nuria; Laza, José Manuel; Cuevas, José María; Gonzalo, B.; Vilas, José Luis; León, L. M.

doi:10.1007/s10965-014-0481-9

Cited by 25 publications

(15 citation statements)

References 39 publications

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“…Once T g has been overcome, at temperatures near to the melting transition, the storage modulus decreases sharply, whereas tanδ increases reaching a plateau due to the crosslinks in the PCO+2%DCP preventing the sample to flow like a viscous liquid. As it was expected, this result is in agreement with the previous results from the authors obtained by DMTA in flexion mode [25] and by DSC [26].…”

Section: Dynamic Mechanical Thermal Analysissupporting

confidence: 94%

“…Dynamic mechanical thermal analysis conducted in tension mode was used in this work to confirm the previously reported results obtained by differential scanning calorimetry (DSC) and DMTA in flexion mode for the PCO+2%DCP sample [25,26]. Figure 5 shows both the logarithm of storage modulus (log E') and the loss factor (tanδ = E"/E') measured for that sample.…”

Section: Dynamic Mechanical Thermal Analysissupporting

confidence: 71%

“…Polycyclooctene (PCO) and 2 wt % dicumyl peroxide (DCP) were blended as described elsewhere [26] in a Haake Rheomix 600 mixing chamber (Thermo Scientific, Waltham, MA, USA) at 70 °C. Subsequently, the samples were crosslinked at 160 °C for 20 min by compression molding under a pressure of 100 bar in a 1.5 mm thickness flat mold coated with two Teflon sheets to reduce the roughness of the specimens.…”

Section: Preparation Of Samplesmentioning

confidence: 99%

“…TMA measurements were made following a similar procedure to that reported earlier [30], where the increase of the sample length was recorded as a function of temperature (Figure 3). This temperature range was selected according to the melting temperature previously calculated from calorimetric analysis [26] and corroborated here by DMTA measurements. …”

Section: Cyclic Thermomechanical Shape Memory Propertiesmentioning

confidence: 99%

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Polymeric Shape-Memory Micro-Patterned Surface for Switching Wettability with Temperature

et al. 2015

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An innovative method to switch the wettability of a micropatterned polymeric surface by thermally induced shape memory effect is presented. For this purpose, first polycyclooctene (PCO) is crosslinked with dicumyl peroxide (DCP) and its melting temperature, which corresponds with the switching transition temperature (T trans ), is measured by Dynamic Mechanical Thermal Analysis (DMTA) in tension mode. Later, the shape memory behavior of the bulk material is analyzed under different experimental conditions employing a cyclic thermomechanical analysis (TMA). Finally, after creating shape memory micropillars by laser ablation of crosslinked thermo-active polycyclooctene (PCO), shape memory response and associated effect on water contact angle is analyzed. Thus, deformed micropillars cause lower contact angle on the surface from reduced roughness, but the original hydrophobicity is restored by thermally induced recovery of the original surface structure.Polymers 2015, 7 1675

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Section: Dynamic Mechanical Thermal Analysissupporting

confidence: 94%

Section: Dynamic Mechanical Thermal Analysissupporting

confidence: 71%

Section: Preparation Of Samplesmentioning

confidence: 99%

Section: Cyclic Thermomechanical Shape Memory Propertiesmentioning

confidence: 99%

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Polymeric Shape-Memory Micro-Patterned Surface for Switching Wettability with Temperature

et al. 2015

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“…Employing commercial PCO, magneto-active polymers, 1 thermoresponsive polymers, 2 shape memory composites, 3 triple-shape memory polymers, 4 and selfrepair systems 5 have been developed. Based on the reversibility of the effect, shape memory polymers are categorized in one-way SMPs (1W-SMPs) and two-way SMPs (2W-SMPs).…”

mentioning

confidence: 99%

Connecting free volume with shape memory properties in noncytotoxic gamma‐irradiated polycyclooctene

Axpe

García-Huete

Cuevas

et al. 2015

J Polym Sci B Polym Phys

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ABSTRACT:The free volume holes of a shape memory polymer have been analyzed considering that the empty space between molecules is necessary for the molecular motion, and the shape memory response is based on polymer segments acting as molecular switches through variable flexibility with temperature or other stimuli. Therefore, thermomechanical analysis (TMA) and positron annihilation lifetime spectroscopy (PALS) have been applied to analyze shape recovery and free volume hole sizes in gamma-irradiated polycyclooctene (PCO) samples, as a noncytotoxic alternative to more conventional PCO crosslinked via peroxide for future applications in medicine. Thus, a first approach relating structure, free volume holes and shape memory properties in gamma-irradiated PCO is presented. The results suggest that free volume holes caused by gamma irradiation in PCO samples facilitate the recovery process by improving movement of polymer chains and open possibilities for the design and control of the macroscopic response. V C 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2015, 53, 1080-1088 KEYWORDS: free volume; gamma-irradiated polycylooctene; noncytotoxic polymers; positron annihilation lifetime spectroscopy; shape memory polymers INTRODUCTION Polycyclooctene (PCO) is a semicrystalline polymer that can be obtained by ring-opening metathesis polymerization (ROMP), and demonstrates outstanding shape memory properties by crosslinking the macromolecular chains. Employing commercial PCO, magneto-active polymers, 1 thermoresponsive polymers, 2 shape memory composites, 3 triple-shape memory polymers, 4 and selfrepair systems 5 have been developed. Based on the reversibility of the effect, shape memory polymers are categorized in one-way SMPs (1W-SMPs) and two-way SMPs (2W-SMPs). In the first case, 1W-SMPs, after the recovery process, it is necessary to program again the material to obtain a new transition between the temporary and the permanent shape. In the second case, 2W-SMPs, the transition between the temporary shape and the permanent one is reversible (reversing the supplied stimulus, temporary or permanent shape can be obtained). As it has been previously described, 6-9 PCO has shown both effects.

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Study on the Foaming Behaviors of PBS and Its Modification with PA6IcoT Assisted by scCO₂

et al. 2022

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Shape memory effect for recovering surface damages on polymer substrates

Cited by 25 publications

References 39 publications

Polymeric Shape-Memory Micro-Patterned Surface for Switching Wettability with Temperature

Polymeric Shape-Memory Micro-Patterned Surface for Switching Wettability with Temperature

Connecting free volume with shape memory properties in noncytotoxic gamma‐irradiated polycyclooctene

Study on the Foaming Behaviors of PBS and Its Modification with PA6IcoT Assisted by scCO₂

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Shape memory effect for recovering surface damages on polymer substrates

Cited by 25 publications

References 39 publications

Polymeric Shape-Memory Micro-Patterned Surface for Switching Wettability with Temperature

Polymeric Shape-Memory Micro-Patterned Surface for Switching Wettability with Temperature

Connecting free volume with shape memory properties in noncytotoxic gamma‐irradiated polycyclooctene

Study on the Foaming Behaviors of PBS and Its Modification with PA6IcoT Assisted by scCO2

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Study on the Foaming Behaviors of PBS and Its Modification with PA6IcoT Assisted by scCO₂