Castor oil and PEG-based shape memory polyurethane films for biomedical applications

2014 ◽  
Vol 131 (15) ◽  
pp. n/a-n/a ◽  
Author(s):  
Mirey Bonfil ◽  
Ahmet Sirkecioglu ◽  
Ozlem Bingol-Ozakpinar ◽  
Fikriye Uras ◽  
F. Seniha Güner
Keyword(s):  
Shape Memory ◽  
Castor Oil ◽  
Biomedical Applications ◽  
Shape Memory Polyurethane

Cellulose nanocrystals (CNC) reinforced shape memory polyurethane ribbons for future biomedical applications and design

2018 ◽  
Vol 33 (3) ◽  
pp. 377-392 ◽  
Author(s):  
Irina T Garces ◽  
Samira Aslanzadeh ◽  
Yaman Boluk ◽  
Cagri Ayranci
Keyword(s):  
Shape Memory ◽  
Cellulose Nanocrystals ◽  
Biomedical Applications ◽  
Flexural Modulus ◽  
Potential Candidate ◽  
The Past ◽  
Printing Cost ◽  
Surgical Sutures ◽  
Orthodontic Devices ◽  
Shape Memory Polyurethane

Shape memory materials are an innovative type of materials that reversibly store a temporary shape and recover back to the original dimensions with the application of an external mechanism such as heat. Shape memory polymers (SMP), specifically thermoplastic SMP (e.g. shape memory polyurethane (SMPU)) have received much attention during the past decade because of the promising future applications and advantages such as ease of processability for thermoplastic SMP (e.g. by 3-D printing), cost, and biocompatibility. In the biomedical field, applications such as stents, surgical sutures, and orthodontic devices, amongst others have been proposed. The addition of fillers to the material can modify the material to improve their load bearing capabilities. Bio-based fillers such as cellulose nanocrystals (CNC) have been proposed in a variety of reinforcing applications. The present work focuses on the experimental description of the addition of nonmodified CNC to SMPU. The work studied the effect on melt-extruded ribbons, for 0, 0.5, 1, 2, and 4 wt%. An increase of yield point, toughness, flexural modulus, recovery rate, and decrease of total time showed that SMPU/CNC nanocomposites are a potential candidate to use in future biomedical applications.

scholarly journals Shape Memory Polyurethane Biocomposites Based on Toughened Polycaprolactone Promoted by Nano-Chitosan

Nanomaterials ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 225 ◽  
Author(s):  
Arvind Gupta ◽  
Beom Soo Kim
Keyword(s):  
Shape Memory ◽  
Biomedical Applications ◽  
Shape Recovery ◽  
Permanent Deformation ◽  
Testing Machine ◽  
Microscopic Analysis ◽  
Original Form ◽  
Electron Microscopic ◽  
Unique Shape ◽  
Shape Memory Polyurethane

The distinctive ability to remember their original form after partial or complete deformation makes shape memory polymers remarkable materials for several engineering and biomedical applications. In the present work, the development of a polycaprolactone based toughened shape memory polyurethane biocomposite promoted by in situ incorporation of chitosan flakes has been demonstrated. The chitosan flakes were homogeneously present in the polymer matrix in the form of nanoflakes, as confirmed by the electron microscopic analysis and probably developed a crosslinked node that promoted toughness (a > 500% elongation at break) and led to a ~130% increment in ultimate tensile strength, as analyzed using a universal testing machine. During a tensile pull, X-ray analysis revealed the development of crystallites, which resulted from a stress induced crystallization process that may retain the shape and melting of the crystallites stimulating shape recovery (with a ~100% shape recovery ratio), even after permanent deformation. The biodegradable polyurethane biocomposite also demonstrates relatively high thermal stability (Tmax at ~360 °C). The prepared material possesses a unique shape memory behavior, even after permanent deformation up to a > 500% strain, which may have great potential in several biomedical applications.

scholarly journals Low density biodegradable shape memory polyurethane foams for embolic biomedical applications

2014 ◽  
Vol 10 (1) ◽  
pp. 67-76 ◽  
Author(s):  
Pooja Singhal ◽  
Ward Small ◽  
Elizabeth Cosgriff-Hernandez ◽  
Duncan J. Maitland ◽  
Thomas S. Wilson
Keyword(s):  
Shape Memory ◽  
Biomedical Applications ◽  
Polyurethane Foams ◽  
Low Density ◽  
Shape Memory Polyurethane

scholarly journals Effects of Sterilization on Shape Memory Polyurethane Embolic Foam Devices

2017 ◽  
Vol 11 (3) ◽  
Author(s):  
Rachael Muschalek ◽  
Landon Nash ◽  
Ryan Jones ◽  
Sayyeda M. Hasan ◽  
Brandis K. Keller ◽  
...  
Keyword(s):  
Electron Beam ◽  
Minimally Invasive ◽  
Shape Memory ◽  
Medical Devices ◽  
Biomedical Applications ◽  
Shape Memory Polymer ◽  
Thermal Characterization ◽  
Device Fabrication ◽  
Shape Memory Polyurethane

Polyurethane shape memory polymer (SMP) foams have been developed for various embolic medical devices due to their unique properties in minimally invasive biomedical applications. These polyurethane materials can be stored in a secondary shape, from which they can recover their primary shape after exposure to an external stimulus, such as heat and water exposure. Tailored actuation temperatures of SMPs provide benefits for minimally invasive biomedical applications, but incur significant challenges for SMP-based medical device sterilization. Most sterilization methods require high temperatures or high humidity to effectively reduce the bioburden of the device, but the environment must be tightly controlled after device fabrication. Here, two probable sterilization methods (nontraditional ethylene oxide (ntEtO) gas sterilization and electron beam irradiation) are investigated for SMP medical devices. Thermal characterization of the sterilized foams indicated that ntEtO gas sterilization significantly decreased the glass transition temperature. Further material characterization was undertaken on the electron beam (ebeam) sterilized samples, which indicated minimal changes to the thermomechanical integrity of the bulk foam and to the device functionality.

Three-dimensional Graphene Coated Shape Memory Polyurethane Foam with Fast Responsive Performance

2021 ◽  
Author(s):  
Tianjiao Wang ◽  
Jun Zhao ◽  
Chuanxin Weng ◽  
Tong Wang ◽  
Yayun Liu ◽  
...  
Keyword(s):  
Shape Memory ◽  
Polyurethane Foam ◽  
Three Dimensional ◽  
Shape Memory Polymers ◽  
Practical Applications ◽  
External Stimuli ◽  
Shape Memory Polyurethane

Shape memory polymers (SMPs) that change shapes as designed by external stimuli have become one of the most promising materials as actuators, sensors, and deployable devices. However, their practical applications...

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