Room temperature deformable shape memory composite with fine‐tuned crystallization induced via nanoclay particles

Sun, Yuchen; Cai, Shenyang; Ren, Jie; Naguib, Hani E.

doi:10.1002/polb.24370

Cited by 23 publications

(23 citation statements)

References 55 publications

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“…In order to create a more efficient SMP, one of the major interests is for room temperature deformability. Previous studies have indicated that composites with different PLA/TPU ratios can achieve such properties . However, one of the major challenges for these composites is the strong elastic recovery and low R f value due to the large amount of TPU phase .…”

Section: Resultsmentioning

confidence: 99%

“…The crystalline or semi‐crystalline polymer is analogous to the cross‐linked nodes and is responsible for maintaining the permanent shape while the amorphous polymer allows for shape recovery. As polymeric blend SMPs are fabricated by blending, it is possible to fine‐tune the actuation behavior by controlling the ratio between the crystalline and amorphous polymers …”

Section: Introductionmentioning

confidence: 99%

“…Recently, polylactic acid (PLA) and thermoplastic polyurethane (TPU) SMP composites gained significant amount of attention for their biocompatibility and mechanical properties . It was observed that the ratio of PLA/TPU and the crystallinity have a strong impact on the shape memory performance . Despite the advances in PLA/TPU‐based SMPs, the applications of these polymers are limited because the functional devices cannot be easily fabricated.…”

Section: Introductionmentioning

confidence: 99%

“…As polymeric blend SMPs are fabricated by blending, it is possible to finetune the actuation behavior by controlling the ratio between the crystalline and amorphous polymers. [16,17] Recently, polylactic acid (PLA) and thermoplastic polyurethane (TPU) SMP composites gained significant amount of attention for their biocompatibility and mechanical properties. [18][19][20] It was observed that the ratio of PLA/TPU and the crystallinity have a strong impact on the shape memory performance.…”

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confidence: 99%

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Hybrid Electroactive Shape Memory Polymer Composites with Room Temperature Deformability

Sun

Chu

Huang

et al. 2019

Macro Materials & Eng

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Polymeric blend shape memory polymers (SMPs) can be constructed from two immiscible polymeric matrices. The shape recovery behavior of these composite systems can be easily controlled by varying the ratio of the polymer blends. It has been recently discovered that the functionality of SMPs can be further enhanced with electroactive ability through the use of conductive fillers. However, the fillers may negatively interact with the SMPs and cause a reduction in the elongation at failure thereby diminishing the shape recovery performance. It is proposed that a plasticizer can be utilized to alter the microstructure of the SMPs with conductive fillers. In this study, a new hybrid SMP is developed by combining single‐walled carbon nanotubes (SWCNT) into a poly(lactic acid) (PLA) and thermoplastic polyurethane (TPU) SMP system containing poly(ethylene glycol) (PEG) plasticizer. The incorporation of PEG is able to lower the activation temperature, while enhancing dispersion of SWCNT. The presence of SWCNT can stabilize the SMP system and significantly enhance the shape‐fixing capability after deformation at room temperature conditions. By carefully controlling the formulation, an electroactive SMP can be created by optimizing the amount of SWCNT and PEG plasticizer.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Hybrid Electroactive Shape Memory Polymer Composites with Room Temperature Deformability

Sun

Chu

Huang

et al. 2019

Macro Materials & Eng

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“…It shows that the fractional viscoelastic model could predict in good agreement with the experimental observations for different levels of pre‐deformation. To quantitatively describe the shape recovery property, the shape recovery ratio is defined by the recovered strain over the fixed strain:

R_{normalr} = 1 - \frac{ɛ (T)}{ɛ (T_{3})}

where ɛ ( T 3 ) is the value of strain measured at the start of the free recovery process. Figure (a,b) shows the comparison of experimental results with predictions for shape recovery ratio under pre‐strain of 5% and 10%.…”

Section: Resultsmentioning

confidence: 99%

A novel fractional viscoelastic constitutive model for shape memory polymers

Pan

2018

J Polym Sci B Polym Phys

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Shape memory polymers (SMPs) are a class of smart materials which can recover from a deformed shape to their original shape by a certain external stimulus. To predict the deformation behaviors of SMPs, different constitutive models have been developed in the last few years. However, most of the constitutive models need many parameters to be determined by specific experiments and complex calibration processes. This drawback has limited their application in promoting the development of SMPs. Thus, it is imperative to develop a new constitutive model which is not only accurate, but also relatively simple. In our work, a novel fractional viscoelastic constitutive model coupling with time‐temperature superposition principle is first proposed for SMPs. Then, frequency sweep and temperature sweep experiments are conducted to determine the parameters of the model. Finally, the shape memory free recovery experiments are carried out to validate the predictive capability of the developed model. By comparing the predicted results with experimental data, we find that though our model has only eleven parameters in total, it could capture the thermomechanical behaviors of SMPs in very good agreement with experimental results. We hope the proposed new model provide researchers with guidelines in designing and optimizing of SMP applications. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018, 56, 1125–1134

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Rheological behavior and morphological and interfacial properties of PLA/TPE blends

Bernardes

Luiz

Santana

et al. 2019

J of Applied Polymer Sci

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Rheological and interfacial tension data were employed to predict the morphology and thermal and mechanical properties of noncompatibilized and compatibilized poly(lactic acid) (PLA)/thermoplastic elastomer (TPE) blends. PLA was melt blended with thermoplastic polyurethane (TPU) and ethylene elastomer (EE) and compatibilized by ethylene-butyl acrylate-glycidyl methacrylate (EBG) in an internal mixer chamber. Both TPU and EE TPEs have higher viscosities than PLA, and the interfacial properties evaluated have revealed better adhesion between domains of PLA-TPU. The efficiency of the compatibilizer agent EBG depended on the TPE type inferred by modifications in the scanning electron microscopy images of PLA/TPE blends and by the Izod impact strength (improved by 23%). The EBG was more effective in the PLA/TPU blend. The TPEs and EBG did not affect the PLA thermal stability, and no thermal event was observed in the usual PLA extrusion and injection temperature range.

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Room temperature deformable shape memory composite with fine‐tuned crystallization induced via nanoclay particles

Cited by 23 publications

References 55 publications

Hybrid Electroactive Shape Memory Polymer Composites with Room Temperature Deformability

Hybrid Electroactive Shape Memory Polymer Composites with Room Temperature Deformability

A novel fractional viscoelastic constitutive model for shape memory polymers

Rheological behavior and morphological and interfacial properties of PLA/TPE blends

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