Effects of graphene quantum dot ( GQD ) on photoluminescence, mechanical, thermal and shape memory properties of thermoplastic polyurethane nanocomposites

2020 ◽  
Author(s):  
Sanaz Sarabiyan Nejad ◽  
Amin Babaie ◽  
Massoumeh Bagheri ◽  
Mostafa Rezaei ◽  
Farhang Abbasi ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Shape Memory ◽  
Thermoplastic Polyurethane ◽  
Graphene Quantum Dot ◽  
Shape Memory Properties ◽  
Polyurethane Nanocomposites

scholarly journals Mechanical, Thermal, and Shape Memory Properties of Three-Dimensional Printing Biomass Composites

Polymers ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1234 ◽  
Author(s):  
Hongjie Bi ◽  
Min Xu ◽  
Gaoyuan Ye ◽  
Rui Guo ◽  
Liping Cai ◽  
...  
Keyword(s):  
Shape Memory ◽  
Wood Flour ◽  
Memory Performance ◽  
Thermoplastic Polyurethane ◽  
Tensile Elongation ◽  
Three Dimensional ◽  
Mechanical Analysis ◽  
Shape Memory Properties ◽  
Shape Memory Composites ◽  
Recovery Angle

In this study, a series of heat-induced shape memory composites was prepared by the hot-melt extrusion and three-dimensional (3D) printing of thermoplastic polyurethane (TPU) using wood flour (WF) with different contents of EPDM-g-MAH. The mechanical properties, microtopography, thermal property analysis, and heat-induced shape memory properties of the composites were examined. The results showed that, when the EPDM-g-MAH content was 4%, the tensile elongation and tensile strength of the composites reached the maximum value. The scanning electron microscopy and dynamic mechanical analysis results revealed a good interface bonding between TPU and WF when the EPDM-g-MAH content was 4%. The thermogravimetric analysis indicated that the thermal stability of TPU/WF composites was enhanced by the addition of 4% EPDM-g-MAH. Heat-induced shape memory test results showed that the shape memory performance of composites with 4% EPDM-g-MAH was better than that of unmodified-composites. The composites’ shape recovery performance at a temperature of 60 °C was higher than that of the composites at ambient temperature. It was also found that, when the filling angle of the specimen was 45°, the recovery angle of the composites was larger.

ZnO Nanorod−Thermoplastic Polyurethane Nanocomposites: Morphology and Shape Memory Performance

2009 ◽  
Vol 42 (22) ◽  
pp. 8933-8942 ◽  
Author(s):  
Hilmar Koerner ◽  
John Kelley ◽  
Justin George ◽  
Lawrence Drummy ◽  
Peter Mirau ◽  
...  
Keyword(s):  
Shape Memory ◽  
Memory Performance ◽  
Thermoplastic Polyurethane ◽  
Zno Nanorod ◽  
Polyurethane Nanocomposites

Hybrid and biocompatible cellulose/polyurethane nanocomposites with water-activated shape memory properties

2019 ◽  
Vol 216 ◽  
pp. 86-96 ◽  
Author(s):  
Leire Urbina ◽  
Ana Alonso-Varona ◽  
Ainara Saralegi ◽  
Teodoro Palomares ◽  
Arantxa Eceiza ◽  
...  
Keyword(s):  
Shape Memory ◽  
Shape Memory Properties ◽  
Polyurethane Nanocomposites

Tunable shape recovery progress of thermoplastic polyurethane by solvents

2018 ◽  
Vol 47 (1) ◽  
pp. 7-13 ◽  
Author(s):  
Changchun Wang ◽  
Bo Kou ◽  
Zusheng Hang ◽  
Xuejuan Zhao ◽  
Tianxuan Lu ◽  
...  
Keyword(s):  
Shape Memory ◽  
Internal Stress ◽  
Recovery Time ◽  
Shape Recovery ◽  
Thermoplastic Polyurethane ◽  
Recovery Process ◽  
Solubility Parameters ◽  
Content Type ◽  
Shape Memory Properties ◽  
Residual Strains

Purpose This study aims to present that the chemo-responsive shape recovery of thermoplastic polyurethane (TPU) is tunable by solvents with different solubility parameters, and it is generic for chemo-responsive shape-memory polymer and its composites. Design/methodology/approach Two kinds of commercial TPU samples with different thicknesses were prepared by panel vulcanizer and injection molding (an industrial manner) to investigate their chemo-responsive shape memory properties in acetic ether and acetone. Findings Results showed that all of TPU films with different thicknesses can fully recover their original shapes weather they recover in acetic ether or acetone. But the recovery time of TPU films in acetone is greatly reduced, especially for the twisting samples. The residual strains of recovery TPU samples after extension reduce obviously. Research limitations/implications The great decrement of recovery time is related to two factors. One is due to the bigger solubility parameter of acetone with higher dipole moment compared with those of acetic ether, and the other is the remained internal stress of TPU films after preparation. The internal stress is identified to have an effect on the shape-memory properties by comparing the recovery process of samples with/without annealing. The reduced residual strains of recovery TPU samples after extension is due to the increasing mobility of polymer segments after molecules of acetic ether penetrates into the polymeric chains. Originality/value This is a universal strategy to control the recovery process of shape-memory materials or composites. The underlying mechanism is generic and should be applicable to chemo-responsive shape-memory polymers or their composites.

Polyurethane/Clay Shape Memory Nanocomposites Based on Palm Oil Polyol

2012 ◽  
Vol 576 ◽  
pp. 236-239 ◽  
Author(s):  
Syazana Ahmad Zubir ◽  
Ernie Suzana Ali ◽  
Sahrim Haji Ahmad ◽  
Norazwani Muhammad Zain ◽  
Soo Kai Wai
Keyword(s):  
Shape Memory ◽  
Palm Oil ◽  
Soft Segment ◽  
Thermoplastic Polyurethane ◽  
Clay Content ◽  
Weight Percent ◽  
Shape Memory Behavior ◽  
Crosslinking Process ◽  
The Matrix ◽  
Polyurethane Nanocomposites

Thermoplastic polyurethane (TPU) nanocomposites were prepared using polycaprolactonediol as the soft segment, 4,4’-diphenylmethane diisocyanate as the hard segment, 1,4-butanediol and palm oil polyol. Nanoclay with certain weight percent (wt%) was reinforced as filler to improve both mechanical and shape memory behavior of the nanocomposites. Palm oil polyol was introduced in order to provide hyperbranched structure for better dispersion of filler in the matrix as well as aiding the crosslinking process. The experimental results showed that the mechanical and shape memory behavior of clay reinforced polyurethane nanocomposites were influenced by clay weight percent in the polymer matrix. TPU with 3 wt% clay showed optimum values of mechanical properties while the shape memory behavior decreases with increasing clay content.

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