Study on the thermal-induced shape memory effect of pyridine containing supramolecular polyurethane

Chen, Heng; Hu, Jinlian; Zhuo, Haitao; Yuen, Chun-wah Marcus; Chan, Laikuen

doi:10.1016/j.polymer.2009.11.034

Cited by 75 publications

(70 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The shape recovery at the first cycle is still beyond 90% in the CLSMPU-PUPy53 core-shell nanofiber under the recovery temperature of 70°C. This behavior is very similar to the thermal-induced shape memory behavior of PUPy53 bulk film, which exhibits not only high shape fixity , but also good shape recovery [17]. This is due to the fact that the PUPy53 polymer has much high glassy modulus as reported by Chen et al [17].…”

Section: Characterizationsupporting

confidence: 82%

“…Figure 4 shows the cyclic strain-stress curve of CLSMPU-PUPy53 core-shell nanofibrous mat. It was reported that the transition temperature of CLSMPU nanofiber is about 46.83°Cwhile the transition temperature of PUPy53 is about 56°C [17]. The CLSMPU nanofiber usually shows unsatisfying shape fixity, less than 80% [20,21].…”

Section: Characterizationmentioning

confidence: 99%

“…The size of the zone of inhibition and the narrowing of the streaks caused by the presence of the antibacterial agent permitted an estimate of the antibacterial activity. Thermal-induced shape memory behaviors were characterized with cyclic tensile test method according to the literature method [17]. The test specimens with a width of 5.0 mm and length of 4.0 mm for cyclic tensile test are cut directly from the nanofibrous mat.…”

Section: Characterizationmentioning

confidence: 99%

“…The low temperature (T low ) for specimen stretching is about 45°C while the high temperature (T high ) for recovering is about 70°C.The test was done using an Instron 4466 apparatus with a temperature-controlled chamber; and a personal computer was used to control and record all data. The shape fixity and shape recovery were calculated from the recorded cyclic strain-stress curves [17]. Figure 2 shows the SEM images of CLSMPUPUPy53 and TPU-PUPyMDI35 core-shell nanofibers; and Figure 3 shows their TEM images.…”

Section: Characterizationmentioning

confidence: 99%

“…Most recently, Chen et al [15][16][17] had also synthesized one novel kind of supramolecular SMPUs containing pyridine moieties. Not only thermal-induced shape memory effect (SME) [17], but moisture-sensitive shape memory effect are also achieved in the pyridine containing SMPUs (PySMPUs) [16]. A preliminary investigation sug-gests that the nanofibers based on the PySMPUs exhibits antibacterial activity.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Coaxial electrospun polyurethane core-shell nanofibers for shape memory and antibacterial nanomaterials

Zhuo¹,

Hu²,

Chen³

2011

Express Polym. Lett.

View full text Add to dashboard Cite

Abstract.A novel kind of shape memory polyurethane (SMPU) nanofibers with core-shell nanostructure is fabricated using coaxial electrospinning. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) results show that nanofibers with core-shell structure or bead-on-string structure can be electrospun successfully from the core solution of polycaprolactone based SMPU (CLSMPU) and shell solution of pyridine containing polyurethane (PySMPU). In addition to the excellent shape memory effect with good shape fixity, excellent antibacterial activity against both gramnegative bacteria and gram-positive bacteria are achieved in the CLSMPU-PySMPU core-shell nanofiber. Finally, it is proposed that the antibacterial mechanism should be resulted from the PySMPU shell materials containing amido group in ! position and the high surface area per unit mass of nanofibers. Thus, the CLSMPU-PySMPU core shell nanofibers can be used as both shape memory nanomaterials and antibacterial nanomaterials.

show abstract

Section: Characterizationsupporting

confidence: 82%

Section: Characterizationmentioning

confidence: 99%

Section: Characterizationmentioning

confidence: 99%

Section: Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Coaxial electrospun polyurethane core-shell nanofibers for shape memory and antibacterial nanomaterials

Zhuo¹,

Hu²,

Chen³

2011

Express Polym. Lett.

View full text Add to dashboard Cite

show abstract

Effects of an Aromatic Fluoro‐Diol and Polycaprolactone on the Properties of the Resultant Polyurethanes

Lee

et al. 2016

Adv Polym Technol

View full text Add to dashboard Cite

In this study, we used 4,4 0 -diphenylmethane diisocyanate (MDI), polycaprolactone diol (PCL), and 4-(1,1,1,3,3,3hexafluoro-2-(4-hydroxyphenyl)propan-2-yl)phenol (HFP) to synthesize novel biodegradable F-containing polyurethanes (HFP/ PUs). Among which PCL is a biodegradable soft segment and HFP is a fluoro chain extender. According to FT-IR and XPS spectroscopies, there is a strong hydrogen bonding interaction between F-(in CF 3 ) and -NH groups in the HFP/PUs. For the HFP/PUs, the initial decomposition temperature, glass transition temperature (T g ), dynamic T g , tensile strength, Young's modulus, and chemical resistance increase with the content of HFP unit or hard segment. This behavior is due to the increase of rigid hard segment and the interaction between CF 3 and -NH groups in the HFP/PUs. On the contrary, HFP/PU containing more HFP has lower value of elongation at break. In addition, the AFM images show that the HFP/PU containing higher HFP content exhibits more humpy protrusions and is more rugged. The results of in vitro erythrocyte adhesion tests indicate that the average quantity of erythrocytes adhered on HFP/PU surface decreases with increasing HFP or fluorine content. So fluorine element with low surface free energy is helpful for HFP/PUs to be used as biomedical materials.

show abstract

Achieving shape memory: Reversible behaviors of cellulose–PU blends in wet–dry cycles

Luo

Zhu

et al. 2011

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

Shape memory effect (SME) was achieved for cellulose–polyurethane (PU) blends of different compositions in wet–dry cycles, featuring that the amorphous cellulose and the PU content served as the fixing phase and the recovery phase, respectively. The dependence on the compositions of the fixity ratio and the recovery ratio was quantitatively measured by tensile tests. The morphological and thermal properties of the blends were further investigated by scanning electron microscopy and thermogravimetric analysis. The storage modulus of the blends varied reversibly in the wet–dry cycles, as determined by dynamic mechanical analysis. Furthermore, the microstructure of the blends reversibly changed correspondingly, as determined by wide‐angle X‐ray scattering diffraction and Fourier transform infrared. It was predicted that the reversible transition in different amorphous cellulose structures triggered by water led to the reversible variation in modulus as well as the wet–dry SME of the blends. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

show abstract

Study on the thermal-induced shape memory effect of pyridine containing supramolecular polyurethane

Cited by 75 publications

References 30 publications

Coaxial electrospun polyurethane core-shell nanofibers for shape memory and antibacterial nanomaterials

Coaxial electrospun polyurethane core-shell nanofibers for shape memory and antibacterial nanomaterials

Effects of an Aromatic Fluoro‐Diol and Polycaprolactone on the Properties of the Resultant Polyurethanes

Achieving shape memory: Reversible behaviors of cellulose–PU blends in wet–dry cycles

Contact Info

Product

Resources

About