The role of foaming process on shape memory behavior of polylactic acid-thermoplastic polyurethane-nano cellulose bio-nanocomposites

2019 ◽  
Vol 91 ◽  
pp. 266-277 ◽  
Author(s):  
Mohsen Barmouz ◽  
Amir Hossein Behravesh
Keyword(s):  
Shape Memory ◽  
Polylactic Acid ◽  
Thermoplastic Polyurethane ◽  
Shape Memory Behavior ◽  
Foaming Process ◽  
Nano Cellulose

The morphology, properties, and shape memory behavior of polylactic acid/thermoplastic polyurethane blends

2014 ◽  
Vol 55 (1) ◽  
pp. 70-80 ◽  
Author(s):  
Xin Jing ◽  
Hao-Yang Mi ◽  
Xiang-Fang Peng ◽  
Lih-Sheng Turng
Keyword(s):  
Shape Memory ◽  
Polylactic Acid ◽  
Thermoplastic Polyurethane ◽  
Shape Memory Behavior

Foaming and thermal characteristics of bio-based polylactic acid–thermoplastic polyurethane blends

2018 ◽  
Vol 54 (6) ◽  
pp. 931-955 ◽  
Author(s):  
Mohsen Barmouz ◽  
Amir Hossein Behravesh
Keyword(s):  
Polylactic Acid ◽  
High Cell Density ◽  
Thermoplastic Polyurethane ◽  
Research Work ◽  
Thermal Characteristics ◽  
High Cell ◽  
Foam Expansion ◽  
Foaming Process ◽  
Cell Densities

This paper reports a research work on characterization of foamed biocompatible polylactic acid–thermoplastic polyurethane blends in terms of microstructural, thermal, and physical properties. The brittleness of the polylactic acid is compensated via blending with an elastoplastic phase of thermoplastic polyurethane. A range of low bulk density foam with a high cell density was produced in a solid state foaming process. Addition of thermoplastic polyurethane phase acted against the cell growth and thus foam expansion, apparently due to its inherent lower storage modulus, which weakens the polymer matrix and leads to gas escape phenomenon. Evaluation of thermal properties showed a tangible effect of blending and foaming process on crystallization of the specimens, which confirmed that the sensitivity of polylactic acid’s crystallinity to CO2 gas saturation was reduced as a result of thermoplastic polyurethane addition. Measurement of cell diameters and cell densities of the foamed samples demonstrated formation of the fine closed cells structure as a result of suitable foaming parameters that were able to deal with stiffness and strength of the polymeric matrix.

scholarly journals Shape-Memory-Recovery Characteristics of Microcellular Foamed Thermoplastic Polyurethane

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 351
Author(s):  
Chang-Seok Yun ◽  
Joo Seong Sohn ◽  
Sung Woon Cha
Keyword(s):  
Shape Memory ◽  
Cell Density ◽  
Shape Recovery ◽  
Structural Changes ◽  
Thermoplastic Polyurethane ◽  
Testing Machine ◽  
Base Material ◽  
Memory Mechanism ◽  
Foaming Process ◽  
Dog Bone

We investigated the shape-recovery characteristics of thermoplastic polyurethane (TPU) with a microcellular foaming process (MCP). Additionally, we investigated the correlation between changes in the microstructure and the shape-recovery characteristics of the polymers. TPU was selected as the base material, and the shape-recovery characteristics were confirmed using a universal testing machine, by manufacturing dog-bone-type injection-molded specimens. TPUs are reticular polymers with both soft and hard segments. In this study, we investigated the shape-memory mechanism of foamed polymers by maximizing the shape-memory properties of these polymers through a physical foaming process. Toward this end, TPU specimens were prepared by varying the gas pressure, foaming temperature, and type of foaming gas in the batch MCP. The effects of internal structural changes were investigated. These experimental variables affected the microstructure and shape-recovery characteristics of the foamed polymer. The generated cell density changed, which affected the shape-recovery characteristics. In general, a higher cell density corresponded to a higher shape-recovery ratio.

scholarly journals Role of B19′ martensite deformation in stabilizing two-way shape memory behavior in NiTi

2012 ◽  
Vol 112 (9) ◽  
pp. 093510 ◽  
Author(s):  
O. Benafan ◽  
S. A. Padula ◽  
R. D. Noebe ◽  
T. A. Sisneros ◽  
R. Vaidyanathan
Keyword(s):  
Shape Memory ◽  
Shape Memory Behavior

Role of samarium additions on the shape memory behavior of iron based alloys

2011 ◽  
Vol 528 (6) ◽  
pp. 2299-2302 ◽  
Author(s):  
R.A. Shakoor ◽  
F. Ahmad Khalid ◽  
Kisuk Kang
Keyword(s):  
Shape Memory ◽  
Shape Memory Behavior ◽  
Iron Based
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