Compressive shape memory behavior of spring‐shaped polylactic acid alloy type

Siahsarani, Armin; Behravesh, Amir Hossein; Barmouz, Mohsen

doi:10.1002/app.45115

Cited by 14 publications

(14 citation statements)

References 35 publications

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“…In the COS 1 HNMR spectrum, the peak at 1.98 ppm was attributed to -CH 3 in the N-alkylated glucosamine residue, and singlet H peak for N-acetyl glucosamine was observed at 2.98 ppm; there was a multistate peak at 3.45–4.12 ppm, which was due to the chemical shift of -CH- on the sugar ring and proton hydrogen at 6C. The peak at 4.58 ppm was attributed to H of glucosamine [ 30 ]. In addition to the chemical shift of H in COS, the absorption peak of the benzene ring and the chemical shift of -HC=N appeared at 7.73–8.33 ppm and 10.12 ppm, respectively.…”

Section: Resultsmentioning

confidence: 99%

The Preparation and Characterization of Chitooligosaccharide–Polylactide Polymers, and In Vitro Release of Microspheres Loaded with Vancomycin

Tang

Zhang

et al. 2022

JFB

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Drug-loaded microspheres are an ideal bone tissue delivery material. In this study, a biodegradable Schiff base chitosan–polylactide was used as the encapsulation material to prepare drug-loaded microspheres as biocompatible carriers for controlled vancomycin release. In this regard, Schiff base chitosan was prepared by the Schiff base method, and then different proportions of the Schiff base chitosan–polylactide polymer were prepared by ring-opening polymerization. Drug-loaded microspheres were prepared by the W/O emulsion method, and the polymers and polymer microspheres were characterized and studied by NMR, IR, and antibacterial methods. The drug loading and release rates of microspheres were determined to investigate the drug loading, encapsulation efficiency, and release rate of drug microspheres at different ratios. In this study, different proportions of Schiff base chitosan–polylactic acid materials are successfully prepared, and vancomycin-loaded microspheres are successfully prepared using them as carriers. This study proves that the materials have antibacterial activities against Staphylococcus aureus and Escherichia coli. The particle size of drug-loaded microspheres was below 10 μm, and the particle size decreased with decreasing molecular weight. The obtained results show that 1:100 microspheres have the highest drug-loading and encapsulation efficiencies, the drug-loaded microspheres have no burst release within 24 h, and the release quantity reaches more than 20%. After 30 days of release, the release amounts of 1:10, 1:20, 1:40, 1:60, and 1:100 drug-loaded microspheres were 64.80 ± 0.29%, 54.43 ± 0.54%, 44.60 ± 0.43%, 42.53 ± 0.40% and 69.73 ± 0.45%, respectively, and the release amount of 1:100 was the highest.

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Section: Resultsmentioning

confidence: 99%

The Preparation and Characterization of Chitooligosaccharide–Polylactide Polymers, and In Vitro Release of Microspheres Loaded with Vancomycin

Tang

Zhang

et al. 2022

JFB

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“…Considerable research has been devoted to the development of novel BSMP formulations that have the potential for use in medicine. For recent examples we direct the reader to the following references . In the Becker lab, we have developed amino acid‐based poly(ester urea)s (PEUs) and explored their shape memory behavior .…”

Section: Future and Outlookmentioning

confidence: 99%

Biodegradable Shape Memory Polymers in Medicine

Peterson

Dobrynin

Becker

2017

Adv Healthcare Materials

151

155

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Shape memory materials have emerged as an important class of materials in medicine due to their ability to change shape in response to a specific stimulus, enabling the simplification of medical procedures, use of minimally invasive techniques, and access to new treatment modalities. Shape memory polymers, in particular, are well suited for such applications given their excellent shape memory performance, tunable materials properties, minimal toxicity, and potential for biodegradation and resorption. This review provides an overview of biodegradable shape memory polymers that have been used in medical applications. The majority of biodegradable shape memory polymers are based on thermally responsive polyesters or polymers that contain hydrolyzable ester linkages. These materials have been targeted for use in applications pertaining to embolization, drug delivery, stents, tissue engineering, and wound closure. The development of biodegradable shape memory polymers with unique properties or responsiveness to novel stimuli has the potential to facilitate the optimization and development of new medical applications.

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“…They found that compared to the non-foam state, the formation of foam structure in the alloys led to a significant reduction in the recovery force. Siahsarani et al 34 manufactured a spring shape memory polymer from the alloy composition of PLA and TPU. They investigated the compression shape memory behavior of the samples, and according to the results, the composition containing a higher percentage of polylactic acid (70% weight percentage) has the highest shape and force recovery.…”

Section: Introductionmentioning

confidence: 99%

Additive manufacturing and investigation of shape memory properties of polylactic acid/thermoplastic polyurethane blend

Abidaryan

Akhoundi

Hajami

2022

Journal of Elastomers & Plastics

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The fused filament fabrication (FFF) process is one of the most widely used additive manufacturing (AM) methods in producing parts with relatively complex geometry due to its low cost and high capability. Using this blend along with the 3D printing method to make complex shapes can have a high potential in medical applications such as stents, so the goal of the following study is to investigate the shape memory properties of Polylactic Acid/Thermoplastic polyurethane (PLA/TPU) blend. The printed samples with 100/0, 80/20, and 60/40 PLA/TPU composition ratios were comprehensively evaluated based on their structural, thermal, and shape memory properties. A differential scanning calorimetry (DSC) test was conducted to determine the glass transition temperatures and crystallization temperature zone of the blends. A full factorial design of experiments was employed to investigate the effect of three variables called composition ratio, printing angle, and filling percentage on shape memory behavior. Using the three-point flexural test, the shape memory behavior of printed samples with composition ratios 100/0,80/20, 60/40, and filling percentages of 50, 75, and 100%, along with printing angles of zero, ±45, and 90°, was evaluated and measured. The annealing process increased the force required to change the shape and crystallization percentage, such that not being processed, no crystals were observed in the X-ray diffraction (XRD) analysis of the samples, while after being annealed, up to 38% of the crystals were formed. Increasing the percentage of TPU and temperature led to the softening of the samples, reducing the strength and elastic modulus, as well. Enhancing the percentage of TPU also decreases the hydrophilic properties of the samples. The results showed that the best shape memory performance is related to the 20 weight percentage of TPU composition, and the maximum recovery force ratio belongs to the sample with such a composition, zero printing angles, and 75% filling percentage, which equals 81.56%, while it equals 74% using compression molding (CM) in all three production blends.

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Compressive shape memory behavior of spring‐shaped polylactic acid alloy type

Cited by 14 publications

References 35 publications

The Preparation and Characterization of Chitooligosaccharide–Polylactide Polymers, and In Vitro Release of Microspheres Loaded with Vancomycin

The Preparation and Characterization of Chitooligosaccharide–Polylactide Polymers, and In Vitro Release of Microspheres Loaded with Vancomycin

Biodegradable Shape Memory Polymers in Medicine

Additive manufacturing and investigation of shape memory properties of polylactic acid/thermoplastic polyurethane blend

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