An experimental investigation on structural design of shape memory polymers

Roudbarian, Nima; Baniasadi, Mahdi; Mojtaba, Ansari; Baghani, Mostafa

doi:10.1088/1361-665x/ab3246

Cited by 43 publications

(53 citation statements)

References 49 publications

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“…Among the AM processes, the FDM process has become attractive to industries and the public due to its cheapness and simplicity. FDM printed products are widely used in automotive manufacturing, biomedicine, smart homes and actuators, stationery, and educational supplies . Generally, the mechanical properties of printed parts by FDM are weaker compared to plastic injection molding products because of the poor bonding and the presence of voids between raters and layers .…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study of Nozzle Temperature and Heat Treatment (Annealing) Effects on Mechanical Properties of High‐Temperature Polylactic Acid in Fused Deposition Modeling

Akhoundi

Nabipour

Hajami

et al. 2020

Polymer Engineering & Sci

107

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Fused deposition modeling (FDM) is the trendiest threedimensional (3D) printing method among additive manufacturing technologies. In this process, the final parts are constructed through layer-by-layer adhesion of thermoplastic polymers. Amorphous thermoplastic polymers have better printability compared to semicrystalline ones; so, they are most popular with FDM users. Generally, the overall mechanical properties of FDM 3D printed parts are weaker in comparison to the traditional methods (such as injection molding) due to the weak bonds between the deposited rasters and layers. Therefore, the introduction of new materials with higher mechanical properties and easy printing process of the semicrystalline polymers has always been challenging to progress the mechanical properties of the products. In this study by the FDM process, the effect of nozzle temperature and heat treatment (annealing) on the mechanical properties of high-temperature polylactic acids is investigated. The increase in the nozzle temperature develops the rasters and layers bonding, and the heat treatment of the parts after printing rises the crystallinity percentage, which is crucial for the improvement of mechanical properties. Experimental results show that an increase in the nozzle temperature raises the tensile strength and modulus to 65.7 MPa and 4.97 GPa, respectively. Furthermore, the heat treatment process increases the tensile strength and modulus up to 67.4 MPa and 5.65 GPa. The final tensile modulus values are the highest ones reported for pure materials printed by the FDM process. POLYM. ENG. SCI., 60:979-987, 2020.

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Section: Introductionmentioning

confidence: 99%

An Experimental Study of Nozzle Temperature and Heat Treatment (Annealing) Effects on Mechanical Properties of High‐Temperature Polylactic Acid in Fused Deposition Modeling

Akhoundi

Nabipour

Hajami

et al. 2020

Polymer Engineering & Sci

107

View full text Add to dashboard Cite

show abstract

“…It can cause an increase in electrical and thermal conductivity for improving the efficiency and performance of produced parts by FDM 3D printer. Rapid tooling and molding, 3D‐printed circuits, and electromagnetic structures for coating are the main applications of these composites . Research studies in the field of polymer/metal composite parts via FDM 3D printer have been attended recently.…”

Section: Introductionmentioning

confidence: 99%

“…Rapid tooling and molding, 3D-printed circuits, and electromagnetic structures for coating are the main applications of these composites. [24][25][26] Research studies in the field of polymer/metal composite parts via FDM 3D printer have been attended recently. Masood et al 27 prepared composite nylon/iron filament and used it in the FDM process to produce inserting components of a plastic injection mold.…”

Section: Introductionmentioning

confidence: 99%

Manufacturing of polymer/metal composites by fused deposition modeling process with polyethylene

Nabipour

Akhoundi

Saed

2019

J of Applied Polymer Sci

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In this study, production of metal/polymer composites using polyethylene as the matrix with various contents of metal powder was investigated. Fused deposition modeling (FDM) process is one of the most popular and conventional additive manufacturing methods to produce three‐dimensional (3D) specimens from computer‐aided design data with complex geometry and lower prices in comparison with the alternative methods. Given the advantages of this process, it seems inevitable for the development of new materials. Utilizing semicrystalline plastics impose challenges for producing parts due to printing issues such as distortion and warpage. In this experimental work, a compounding production line was implemented to produce composite filaments with 25, 50, and 75 wt % of copper powder suitable for the FDM process. After dealing with printing issues, flexural, electrical conductivity, and bulk density tests were done. The micrographs of the specimens were examined via scanning electron microscopy to reveal the distribution of the copper particles. It is believed that the metal/polymer filament could be used to print new 3D parts. The material could be utilized in electromagnetic structures for some specific applications, such as shielding, with new properties. Also, by solving printing problems for a semicrystalline polymer, it can be encouraging to examine printing process for other rarely used thermoplastics. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48717.

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“…Besides, from the phase transition view, classical thermomechanical tests, such as uniaxial tension or compression, are necessary. In our group, some experimental studies in this regard have been carried out recently (Abbasi-Shirsavar et al, 2018; Ansari et al, 2019; Roudbarian et al, 2019a, 2019b).…”

Section: The Molecular Structure Of Smps and Their Classificationmentioning

confidence: 99%

A comprehensive review on thermomechanical constitutive models for shape memory polymers

Yarali

Taheri

Baghani

2020

Journal of Intelligent Material Systems and Structures

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Shape memory polymers are a class of smart materials, which are capable of fixing their deformed shapes, and can return to their original shape in reaction to external stimulus such as heat. Also due to their exceptional properties, they are mostly used in four-dimensional printing applications. To model and investigate thermomechanical response of shape memory polymers mathematically, several constitutive equations have been developed over the past two decades. The purpose of this research is to provide an up-to-date review on structures, classifications, applications of shape memory polymers, and constitutive equations of thermally responsive shape memory polymers and their composites. First, a comprehensive review on the properties, structure, and classifications of shape memory polymers is conducted. Then, the proposed models in the literature are presented and discussed, which, particularly, are focused on the phase transition and thermo-viscoelastic approaches for conventional, two-way as well as multi-shape memory polymers. Then, a statistical analysis on constitutive relations of thermally activated shape memory polymers is carried out. Finally, we present a summary and give some concluding remarks, which could be helpful in selection of a suitable shape memory polymer constitutive model under a typical application.

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An experimental investigation on structural design of shape memory polymers

Cited by 43 publications

References 49 publications

An Experimental Study of Nozzle Temperature and Heat Treatment (Annealing) Effects on Mechanical Properties of High‐Temperature Polylactic Acid in Fused Deposition Modeling

An Experimental Study of Nozzle Temperature and Heat Treatment (Annealing) Effects on Mechanical Properties of High‐Temperature Polylactic Acid in Fused Deposition Modeling

Manufacturing of polymer/metal composites by fused deposition modeling process with polyethylene

A comprehensive review on thermomechanical constitutive models for shape memory polymers

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