Fluorescent shape-memory hyperbranched polyurethanes: Synthesis, characterization and evaluation of cytotoxicity

Gopinath, A.; Subaraja, Mamangam; Nasar, A. Sultan

doi:10.1016/j.eurpolymj.2018.09.037

Cited by 9 publications

(3 citation statements)

References 59 publications

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“…The presence of urethane characteristic bands in FITR spectrum of PU in the wavenumbers of 1625-1775 and 3300-3400 cm −1 indicates formation of the urethane linkages. [27,30,31] Moreover, incorporation of different MNPs in the PU matrix did not affect chemical structure of PU, as shown from the unchanged relative position of the bands. [1] Due to high peak intensities of different functionalities of PU, the characteristic band of Fe 3 O 4 MNPs (Fe-O at 570-600 cm −1 ) is undetectable in FTIR spectra of the nanocomposites.…”

Section: Chemical Characteristicsmentioning

confidence: 99%

Tuning Microphase Separation, Thermal Characteristics, and Physicomechanical Properties of Shape Memory Polyurethanes by Incorporation of Isocyanate‐Modified Fe₃O₄ Magnetic Nanoparticles

Babaie

Rezaei

Roghani‐Mamaqani

2021

Macro Materials & Eng

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Fe 3 O 4 magnetic nanoparticles (MNPs) are subsequently modified with (3-aminopropyl) triethoxysilane (APTES) and octadecyl isocyanate (OD) to yield MNPs-g-OD. Fourier-transform infrared (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and vibrating sample magnetometer (VSM) verified successful modification of MNPs with three different ratios of OD. Shape memory polyurethane (SMPU) nanocomposites containing 4 wt% of the neat, APTES-grafted, and OD-grafted MNPs are prepared through solution casting, where a strong correlation is achieved between the microstructure, crystallinity, thermal, and mechanical properties of the nanocomposites. Phase mixing degree of the soft and hard phases is increased by hydrogen bonding between the OD and polyurethane (PU) chains, causing to decrease of crystallization ability of PU chains. Field-emission scanning electron microscopy (FE-SEM) images show that high dispersion of MNPs-g-OD reduces the number and size of their aggregation sites in the PU matrix. The nanocomposites show high Young's modulus, because of increasing hydrogen bonding index of carbonyl groups with incorporation of MNPs-g-OD into the PU matrix. The nanocomposites show lower Young's modulus with increasing the degree of crystallinity. Shape memory studies indicated that all the samples have considerable shape memory abilities at 50 °C and room temperature. However, shape fixity ratios show a close dependence on the degree of crystallinity at room temperature.

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Section: Chemical Characteristicsmentioning

confidence: 99%

Tuning Microphase Separation, Thermal Characteristics, and Physicomechanical Properties of Shape Memory Polyurethanes by Incorporation of Isocyanate‐Modified Fe₃O₄ Magnetic Nanoparticles

Babaie

Rezaei

Roghani‐Mamaqani

2021

Macro Materials & Eng

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“…To date, SMTPUs have been used in various applications, including adhesives, textile and apparel products, medical devices, and soft actuators, owing to their versatile structures and properties, such as their relatively low cost, simple synthetic methods, good processability properties, and high stability to the surrounding atmosphere, in addition to their convenient shape-memory temperature intervals and high degrees of shape recovery [ 23 ]. More specifically, polymer temperature sensors have been developed, as have SMTPUs, for use in the handgrips of spoons, toothbrushes, and kitchen knives.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Novel Shape Memory Thermoplastic Polyurethanes (SMTPUs) from Bio-Based Materials for Application in 3D/4D Printing Filaments

et al. 2023

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Bio-based thermoplastic polyurethanes have attracted increasing attention as advanced shape memory materials. Using the prepolymer method, novel fast-responding shape memory thermoplastic polyurethanes (SMTPUs) were prepared from 100% bio-based polyester polyol, poly-propylene succinate derived from corn oil, diphenyl methane diisocyanate, and bio-based 1,3-propanediol as a chain extender. The morphologies of the SMTPUs were investigated by Fourier transform infrared spectroscopy, atomic force microscopy, and X-ray diffraction, which revealed the interdomain spacing between the hard and soft phases, the degree of phase separation, and the intermixing level between the hard and soft phases. The thermal and mechanical properties of the SMTPUs were also investigated, wherein a high hard segment content imparted unique properties that rendered the SMTPUs suitable for shape memory applications at varying temperatures. More specifically, the SMTPUs exhibited a high level of elastic elongation and good mechanical strength. Following compositional optimization, a tensile strength of 24–27 MPa was achieved, in addition to an elongation at break of 358–552% and a hardness of 84–92 Shore A. Moreover, the bio-based SMTPU exhibited a shape recovery of 100%, thereby indicating its potential for use as an advanced temperature-dependent shape memory material with an excellent shape recoverability.

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“…Although it is accepted that they are blood compatible, however, PUs are known to be relatively permeable towards water and gases 10‐13 . And to ensure the durability of cardiovascular devices it is particularly recommended to have a material with a strong moisture resistance 7,9,14‐16 . The gas and water permeability of the material is a key factor since the entry of air into the medical device (for example, an artificial heart) would result in an efficiency loss, while the water ingress could cause corrosion of metal parts, thus decreasing the duration of the system life.…”

Section: Introductionmentioning

confidence: 99%

Enhanced water and oxygen barrier performance of flexible polyurethane membranes for biomedical application

Marcano

Fatyeyeva

Koun

et al. 2021

J Biomedical Materials Res

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In order to improve water and oxygen barrier properties, the surface of two commercial medical grade polyurethane (PU) membranes (Chronoflex® AR‐LT and Bionate® II) was modified by a spray deposited film of poly(ethylene‐co‐vinyl alcohol) (EVOH). The influence of the temperature, the deposited layer thickness and the EVOH ethylene group percentage (27%, 32%, and 44% for EVOH27, EVOH32, and EVOH44, respectively) on the barrier properties of the PU/EVOH multilayered membranes was investigated. The increase of the EVOH layer thickness leads to higher oxygen barrier properties (the highest barrier improvement factor of 412 was obtained). However, in case of the deposited layer thickness higher than 18 μm, microcracks appeared on the treated surface promote a significant loss of the barrier effect. Due to its higher crystallinity degree, EVOH27 provides a higher oxygen barrier effect compared to EVOH32 and EVOH44. On the contrary, an increase of the water barrier properties was observed with the increase of the percentage of ethylene groups. Moreover, the delamination of the EVOH layer was noted after water permeation, especially in case of EVOH44, which is the most hydrophobic layer. Nevertheless, significant decrease of the water and oxygen permeability of the modified PU membranes was achieved, thus showing the benefit of using the EVOH spray deposition for the biomedical application, which requires high performance material with flexible and barrier properties.

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Fluorescent shape-memory hyperbranched polyurethanes: Synthesis, characterization and evaluation of cytotoxicity

Cited by 9 publications

References 59 publications

Tuning Microphase Separation, Thermal Characteristics, and Physicomechanical Properties of Shape Memory Polyurethanes by Incorporation of Isocyanate‐Modified Fe₃O₄ Magnetic Nanoparticles

Tuning Microphase Separation, Thermal Characteristics, and Physicomechanical Properties of Shape Memory Polyurethanes by Incorporation of Isocyanate‐Modified Fe₃O₄ Magnetic Nanoparticles

Synthesis of Novel Shape Memory Thermoplastic Polyurethanes (SMTPUs) from Bio-Based Materials for Application in 3D/4D Printing Filaments

Enhanced water and oxygen barrier performance of flexible polyurethane membranes for biomedical application

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Fluorescent shape-memory hyperbranched polyurethanes: Synthesis, characterization and evaluation of cytotoxicity

Cited by 9 publications

References 59 publications

Tuning Microphase Separation, Thermal Characteristics, and Physicomechanical Properties of Shape Memory Polyurethanes by Incorporation of Isocyanate‐Modified Fe3O4 Magnetic Nanoparticles

Tuning Microphase Separation, Thermal Characteristics, and Physicomechanical Properties of Shape Memory Polyurethanes by Incorporation of Isocyanate‐Modified Fe3O4 Magnetic Nanoparticles

Synthesis of Novel Shape Memory Thermoplastic Polyurethanes (SMTPUs) from Bio-Based Materials for Application in 3D/4D Printing Filaments

Enhanced water and oxygen barrier performance of flexible polyurethane membranes for biomedical application

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Product

Resources

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Tuning Microphase Separation, Thermal Characteristics, and Physicomechanical Properties of Shape Memory Polyurethanes by Incorporation of Isocyanate‐Modified Fe₃O₄ Magnetic Nanoparticles

Tuning Microphase Separation, Thermal Characteristics, and Physicomechanical Properties of Shape Memory Polyurethanes by Incorporation of Isocyanate‐Modified Fe₃O₄ Magnetic Nanoparticles