Preparation of amorphous nanocomposites with quick heat triggered shape memory behavior

Babaahmadi, Masoud; Sabzi, Mohammad; Mahdavinia, Gholam Reza; Keramati, Mohsen

doi:10.1016/j.polymer.2017.01.074

Cited by 46 publications

(30 citation statements)

References 49 publications

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“…Additionally, the wide and weak peak of graphene shifted to lower 2θ values in the pattern of PVAc‐G nanocomposite fibers. This reveals that the applied ultrasonic vibrations during sample preparation increased the interlayer distance between the graphene nanosheets in PVAc‐G, and these well‐dispersed structures almost preserved in the matrix during the solvent evaporation process …”

Section: Resultsmentioning

confidence: 89%

“…Figure shows that as graphene nanoplatelets were loaded into the fibers (especially PVAc fibers), the required stress to achieve this level of strain increased (∼0.3 MPa for PLA/PVAc and ∼1.0 MPa for PLA/PVAc‐G). This can be attributed to the noticeable increment in the modulus of polymers (especially the PVAc with inherent low modulus) when the robust graphene nanoplatelets were introduced into these matrices …”

Section: Resultsmentioning

confidence: 99%

“…Shape memory polymers (SMPs), a class of stimuli‐responsive materials, are able to switch from temporary shape(s) to their original shape upon the application of specific external stimuli, such as heat, infrared light, electricity, radio frequency, alternating magnetic field, and solvent …”

Section: Introductionmentioning

confidence: 99%

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Designing triple‐shape memory polymers from a miscible polymer pair through dual‐electrospinning technique

Sabzi

Ranjbar‐Mohammadi

Zhang

et al. 2019

J of Applied Polymer Sci

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Recently, multiple‐shape memory polymers (SMPs) have attracted a great deal of attention in biomedical applications. Therefore, a series of triple‐SMPs were developed by simply blending of two immiscible SMPs exhibiting two distinct transition temperatures, which is required for triple‐shape memory (SM) effect. However, fabrication of triple‐SMPs from completely miscible polymer pairs using the conventional blending approach is a challenging problem. Because this type of blends consists of one homogeneous phase and thereby exhibit only one transition temperature and dual‐SM behavior. To overcome this problem, herein, a novel and versatile strategy is introduced for preparation of phase separated blends from a completely miscible polymer pair, exhibiting triple‐SM behavior. Dual‐electrospinning technique was utilized to simultaneously electrospin poly(lactic acid) (PLA) and poly(vinyl acetate) (PVAc), as a model miscible polymer pair, to obtain an interwoven polymer composite with two well‐separated thermal transitions, as revealed by dynamic mechanical analyze. Consequently, the SM experiments revealed that the electrospun PLA/PVAc composites have triple‐SM behavior. Furthermore, incorporation of graphene nanoplatelets into the composite fibers significantly improved the triple‐SM properties of samples. Additionally, excellent adherence and spreading of the osteoblasts on the fibrous scaffolds containing graphene were observed. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47471.

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Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Designing triple‐shape memory polymers from a miscible polymer pair through dual‐electrospinning technique

Sabzi

Ranjbar‐Mohammadi

Zhang

et al. 2019

J of Applied Polymer Sci

Self Cite

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“…Inorganic fillers are ideal candidate materials with which to improve the mechanical strength of SMPs. Various inorganic fillers, such as carbon nanotubes (CNTs), carbon black, chopped fiber, and graphene and its oxide, can be used in SMP matrices . The outstanding mechanical properties of composites are a result of the load transfer from polymer matrix to filler materials that are of higher stiffness and failure strength.…”

Section: Introductionmentioning

confidence: 99%

Shape memory behavior of carbon nanotube‐reinforced trans‐1,4‐polyisoprene and low‐density polyethylene composites

Xia

Gui-xue

2019

Polymers for Advanced Techs

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Shape memory composites of trans‐1,4‐polyisoprene (TPI) and low‐density polyethylene (LDPE) with easily achievable transition temperatures were prepared by a simple physical blending method. Carbon nanotubes (CNTs) were introduced to improve the mechanical properties of the TPI/LDPE composites. The mechanical, cure, thermal, and shape memory properties of the TPI/LDPE/CNTs composites were investigated in this study. In these composites, the cross‐linked network generated in both the TPI and LDPE portions acted as a fixed domain, while the crystalline regions of the TPI and LDPE portions acted as a domain of reversible shape memory behavior. We found that CNTs acted as not only reinforced fillers but also nucleation agents, which improved the crystalline degree of the TPI and LDPE portions of the composites. Compared with the properties at the other CNT doses, the mechanical properties of the TPI/LDPE composites when the CNT dose was 1 phr were improved significantly, showing excellent shape memory properties (Rf = 97.85%, Rr = 95.70%).

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“…Shape memory polymers (SMPs) could switch from one or several temporary shapes to their permanent shapes when stimulated by heat , electricity , light , pH values , or solvent . SMPs have the advantages of low cost, light weight, and good processing properties compared with shape memory alloys (SMAs) and shape memory ceramics (SMCs) .…”

Section: Introductionmentioning

confidence: 99%

Facile fabrication of foamed natural Eucommia ulmoides gum composites with heat‐triggered shape memory behavior

2018

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Shape memory polymers (SMPs) are a type of smart material with potential application in aerospace engineering, biomedical devices, and sensors. In this article, we propose a new technique for the preparation of foamed Eucommia ulmoides gum (EUG) composites, which have excellent one‐way and two‐way shape memory performances. The advantages of these foamed composites are not only light weight but also good shape memory performance. For their remarkably light weight, large deformation, and efficient cost, these composites are expected to be a kind of popular smart materials in the future. We studied the properties of foamed composites via mechanical measurements, swelling experiments, thermal analysis and shape memory analysis, hoping to establish the relationship between the microstructure and macroscopic properties of composites. The results showed that the composites with 0.4 phr sulfur had superior one‐way shape memory properties and moderate mechanical properties. In the two‐way shape memory tests, the composites performed excellent two‐way shape memory properties with the applied stress ranging from 200 to 350 KPa. POLYM. COMPOS., 40:3075–3083, 2019. © 2018 Society of Plastics Engineers

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Preparation of amorphous nanocomposites with quick heat triggered shape memory behavior

Cited by 46 publications

References 49 publications

Designing triple‐shape memory polymers from a miscible polymer pair through dual‐electrospinning technique

Designing triple‐shape memory polymers from a miscible polymer pair through dual‐electrospinning technique

Shape memory behavior of carbon nanotube‐reinforced trans‐1,4‐polyisoprene and low‐density polyethylene composites

Facile fabrication of foamed natural Eucommia ulmoides gum composites with heat‐triggered shape memory behavior

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