Nanocomposites based on poly(l-lactide)/poly(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mi mathvariant="bold">ε</mml:mi></mml:math>-caprolactone) blends with triple-shape memory behavior: Effect of the incorporation of graphene nanoplatelets (GNps)

Molavi, Fatemeh Khademeh; Ghasemi, Ismaeil; Messori, Massimo; Esfandeh, Masoud

doi:10.1016/j.compscitech.2017.08.021

Cited by 46 publications

(13 citation statements)

References 36 publications

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“…Khademeh Molavi et al 14 studied the shape memory behaviors of PLA/PCL blend in the presence of graphene nanosheets. They showed that shape memory properties could be controlled using viscoelastic properties, and also the amount of reversibility in studied samples was associated with their time-dependent properties.…”

Section: Introductionmentioning

confidence: 99%

Disclosing the role of surface and bulk erosion on the viscoelastic behavior of biodegradable poly(ε‐caprolactone)/poly(lactic acid)/hydroxyapatite nanocomposites

Shojaei

Nikuei

Goodarzi

et al. 2018

J of Applied Polymer Sci

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In this study, biodegradable polymer blends and their nanocomposites were prepared using poly(ε-caprolactone) (PCL) and poly(lactic acid) (PLA) as blending components and hydroxyapatite (HA) nanoparticles as reinforcement. X-ray diffraction spectra showed that the presence of HA nanoparticles enhanced the intensity of the peaks (100) and (200) corresponding to the PCL's crystalline planes. The transmission electron microscopy images confirmed the high tendency of HA nanoparticles to locate in the PLA phase. The water uptake values of samples measured at pH 4 were more than those measured at other pH values. The weight loss behavior of blends in acidic medium was completely different from that in basic and neutral media. The Williams-Landel-Ferry equation and time-temperature superposition principle were applied to the creep compliance of the samples and their master curves were determined at reference temperature of 30 C, and the mechanical properties of samples were predicted in other conditions. The effect of pH on the creep-recovery response of studied samples was analyzed. From this analysis, it could be found that at pH 4, the creep stain increased, while, at pH 7, there was no a significant change in the viscoelastic property.

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Section: Introductionmentioning

confidence: 99%

Disclosing the role of surface and bulk erosion on the viscoelastic behavior of biodegradable poly(ε‐caprolactone)/poly(lactic acid)/hydroxyapatite nanocomposites

Shojaei

Nikuei

Goodarzi

et al. 2018

J of Applied Polymer Sci

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“…The first heating eliminates the sample's thermal history. The melting peaks of PCL and PLA are found at 57.5 and 152.3 • C, respectively [9,28]. At 98.4 • C, an exothermic effect of cold crystallization of PLA is observed, which indicates that PLA does not completely crystallize when the samples are obtained at temperature treatment.…”

Section: Mechanical Propertiesmentioning

confidence: 98%

“…For these purposes, a polymer scaffold was compressed at a temperature above [4], below [5], or near the SME activation temperature and cooled without removing the load to fix the temporary shape. The activation of "self-fitting" occurs directly in the recipient's body by one of the known methods, e.g., a direct method-heating or using additional tools-magnetic particles and fields, ultrasonic treatment [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Polymer Composite Materials Based on Polylactide with a Shape Memory Effect for “Self-Fitting” Bone Implants

et al. 2021

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The development of adaptive medical structures is one of the promising areas of bioengineering. Polymer composite materials based on polylactide (PLA) are interesting not only for their properties, such as biocompatibility, mechanical properties, biodegradation, and convenience of use, but also for demonstrating shape memory effect (SME). In this study, reducing the activation initiation temperature and the SME activation energy was achieved by forming a composite based on PLA containing 10% poly (ε -caprolactone) (PCL). The effect of the plasticizer on the structure, mechanical properties, and especially SME of the composite, was studied by DSC, SEM, FTIR spectroscopy, compression tests, and DMA. By varying the composition, the beginning of the SME activation was reached at 45 °C, and the apparent activation energy of the process decreased by 85 kJ/mol, ensuring safe and effective use of the material as a precursor for temporary self-fitting scaffolds for reconstructive surgery.

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“…Recently, multiple shape-memory polymers have attracted much attention, since they can be easily tailored by changing the transition temperatures without resorting to the synthesis of other polymers, and, besides, can be designed in several ways [146]. Multiple-SMPs are usually produced by blending two immiscible SM polymers characterized by two different transition temperatures [147], thus considering that the blending of two miscible polymers would lead to a homogeneous phase that would exhibit only one T trans and dual-SM behavior. Therefore, with the aim of fabricating a material that showed triple-SM behavior constituted by miscible materials, Sabzi et al [148] designed a triple-SMP consisting of PLA and PVAc, materials with two distinct T g, through the co-electrospinning method, Additionally, graphene nanoplatelets were included to improve the SM behavior [149].…”

Section: Tissue Engineeringmentioning

confidence: 99%

Shape-Memory Materials via Electrospinning: A Review

et al. 2022

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This review aims to point out the importance of the synergic effects of two relevant and appealing polymeric issues: electrospun fibers and shape-memory properties. The attention is focused specifically on the design and processing of electrospun polymeric fibers with shape-memory capabilities and their potential application fields. It is shown that this field needs to be explored more from both scientific and industrial points of view; however, very promising results have been obtained up to now in the biomedical field and also as sensors and actuators and in electronics.

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Nanocomposites based on poly(l-lactide)/poly(ε-caprolactone) blends with triple-shape memory behavior: Effect of the incorporation of graphene nanoplatelets (GNps)

Cited by 46 publications

References 36 publications

Disclosing the role of surface and bulk erosion on the viscoelastic behavior of biodegradable poly(ε‐caprolactone)/poly(lactic acid)/hydroxyapatite nanocomposites

Disclosing the role of surface and bulk erosion on the viscoelastic behavior of biodegradable poly(ε‐caprolactone)/poly(lactic acid)/hydroxyapatite nanocomposites

Polymer Composite Materials Based on Polylactide with a Shape Memory Effect for “Self-Fitting” Bone Implants

Shape-Memory Materials via Electrospinning: A Review

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