Shape memory behaviors in cylindrical shell PLA/TPU-cellulose nanofiber bio-nanocomposites: Analytical and experimental assessment

Barmouz, Mohsen; Behravesh, Amir Hossein

doi:10.1016/j.compositesa.2017.06.014

Cited by 34 publications

(21 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Considerable effect of CNFs inclusion on force recovery was reported. [ 32 ] Among these nanofillers, graphene oxide (GO) has received a great deal of interest. Its large surface area, excellent thermomechanical behavior, and 2D structure make it an outstanding nanofiller of choice for improving mechanical properties of polymers.…”

Section: Introductionmentioning

confidence: 99%

Influence of Graphene Oxide on Thermally Induced Shape Memory Behavior of PLA/TPU Blends: Correlation with Morphology, Creep Behavior, Crystallinity, and Dynamic Mechanical Properties

Azadi

Jafari

Khonakdar

et al. 2020

Macro Materials & Eng

View full text Add to dashboard Cite

In this study, shape memory is thermally induced in a series of graphene oxide (GO) filled poly(lactic acid)/thermoplastic polyurethane (PLA/TPU) blends, prepared via melt mixing process, and their shape recovery and shape fixity are measured, and the results are correlated with morphology, dynamic mechanical properties, crystallinity and creep recovery behavior. Morphological analysis by scanning and transmission electron microscopy reveals that the blends are immiscible, and GO platelets are mainly localized in the TPU phase of the blends, which lead to smaller and more elongated TPU droplets with improved interfacial adhesion being responsible for the improved shape recovery performance compared to the unfilled blend. A systematic enhancement found in storage and Young's modulus, tensile strength, creep resistance and creep recovery, and cold crystallinity as a result of GO inclusion are in agreement with the improved shape recovery, shape fixity and overall shape memory performance of the filled systems. The developed PLA/TPU/GO nanocomposites with highly improved mechanical properties can be utilized as a new class of environmentally friendly shape memory materials for a broad range of applications.

show abstract

Section: Introductionmentioning

confidence: 99%

Influence of Graphene Oxide on Thermally Induced Shape Memory Behavior of PLA/TPU Blends: Correlation with Morphology, Creep Behavior, Crystallinity, and Dynamic Mechanical Properties

Azadi

Jafari

Khonakdar

et al. 2020

Macro Materials & Eng

View full text Add to dashboard Cite

show abstract

“…Barmouz et al investigated the shape memory behavior of poly(lactic acid)-thermoplastic polyurethane/cellulose-nanofiber bio-nanocomposites. They concluded that through the addition of cellulose nanofibers, stress recovery of >40% could be achieved with little change in strain recovery [43]. Kawaguchi et al found that by combining chitosan fibers with polyether-based thermoplastic polyurethane, the crystal structure gradually changed from semi-crystalline to amorphous state despite little or no change to the glass transition temperature.…”

Section: Introductionmentioning

confidence: 99%

Shape-Memory Nanofiber Meshes with Programmable Cell Orientation

Niiyama

Tanabe

Uto

et al. 2019

Fibers

View full text Add to dashboard Cite

In this work we report the rational design of temperature-responsive nanofiber meshes with shape-memory properties. Meshes were fabricated by electrospinning poly(ε-caprolactone) (PCL)-based polyurethane with varying ratios of soft (PCL diol) and hard [hexamethylene diisocyanate (HDI)/1,4-butanediol (BD)] segments. By altering the PCL diol:HDI:BD molar ratio both shape-memory properties and mechanical properties could be readily turned and modulated. Though mechanical properties improved by increasing the hard to soft segment ratio, optimal shape-memory properties were obtained using a PCL/HDI/BD molar ratio of 1:4:3. Microscopically, the original nanofibrous structure could be deformed into and maintained in a temporary shape and later recover its original structure upon reheating. Even when deformed by 400%, a recovery rate of >89% was observed. Implementation of these shape memory nanofiber meshes as cell culture platforms revealed the unique ability to alter human mesenchymal stem cell alignment and orientation. Due to their biocompatible nature, temperature-responsivity, and ability to control cell alignment, we believe that these meshes may demonstrate great promise as biomedical applications.

show abstract

“…On the basis of elastomers, the polymer essentially shows excellent shape memory effects and has the advantages of a large recovery ability, flexible transition temperatures, a light weight, and a superior processing ability [4,5,6,8]. Thermoplastic polyurethane elastomer (TPU) is a soft material with flexibility, durability, and good entropic elasticity, and has an excellent shape memory function [9,10]. TPU is a kind of block copolymer composed of soft and hard segments, which presents a series of characteristics, depending on the ratio of hard and soft segments [11].…”

Section: Introductionmentioning

confidence: 99%

“…Soft segments serve as switches to maintain temporary shapes, while the hard segments are used to memorise initial shapes [13]. The polyurethane series matrix composites have been widely studied [8,9,14], such as the polyurethane(PU)/cellulose nanocrystals nanocomposites, cellulose nanowhiskers (CNWs)-PU composites [6], poly (lactic acid) (PLA)/TPU-cellulose nanofiber nanocomposites [10], TPU/poly (ε-caprolactone) (PCL) blends, poly(vinyl alcohol) particle-TPU composites [15], and poly (glycerol sebacate urethane)-cellulose nanocomposites [16].…”

Section: Introductionmentioning

confidence: 99%

Mechanical, Thermal, and Shape Memory Properties of Three-Dimensional Printing Biomass Composites

et al. 2018

Polymers

View full text Add to dashboard Cite

In this study, a series of heat-induced shape memory composites was prepared by the hot-melt extrusion and three-dimensional (3D) printing of thermoplastic polyurethane (TPU) using wood flour (WF) with different contents of EPDM-g-MAH. The mechanical properties, microtopography, thermal property analysis, and heat-induced shape memory properties of the composites were examined. The results showed that, when the EPDM-g-MAH content was 4%, the tensile elongation and tensile strength of the composites reached the maximum value. The scanning electron microscopy and dynamic mechanical analysis results revealed a good interface bonding between TPU and WF when the EPDM-g-MAH content was 4%. The thermogravimetric analysis indicated that the thermal stability of TPU/WF composites was enhanced by the addition of 4% EPDM-g-MAH. Heat-induced shape memory test results showed that the shape memory performance of composites with 4% EPDM-g-MAH was better than that of unmodified-composites. The composites’ shape recovery performance at a temperature of 60 °C was higher than that of the composites at ambient temperature. It was also found that, when the filling angle of the specimen was 45°, the recovery angle of the composites was larger.

show abstract

Shape memory behaviors in cylindrical shell PLA/TPU-cellulose nanofiber bio-nanocomposites: Analytical and experimental assessment

Cited by 34 publications

References 41 publications

Influence of Graphene Oxide on Thermally Induced Shape Memory Behavior of PLA/TPU Blends: Correlation with Morphology, Creep Behavior, Crystallinity, and Dynamic Mechanical Properties

Influence of Graphene Oxide on Thermally Induced Shape Memory Behavior of PLA/TPU Blends: Correlation with Morphology, Creep Behavior, Crystallinity, and Dynamic Mechanical Properties

Shape-Memory Nanofiber Meshes with Programmable Cell Orientation

Mechanical, Thermal, and Shape Memory Properties of Three-Dimensional Printing Biomass Composites

Contact Info

Product

Resources

About