State diagram of phase transition temperatures and solvent-induced recovery behavior of shape-memory polymer

2012 ◽  
Vol 127 (4) ◽  
pp. 2896-2904 ◽  
Author(s):  
Haibao Lu
Keyword(s):  
Phase Transition ◽  
Shape Memory ◽  
Shape Memory Polymer ◽  
State Diagram ◽  
Transition Temperatures ◽  
Phase Transition Temperatures ◽  
Recovery Behavior

scholarly journals Biobased Thermoplastic Elastomers: Structure-Property Relationship of Poly(hexamethylene 2,5-furanodicarboxylate)-Block-Poly(tetrahydrofuran) Copolymers Prepared by Melt Polycondensation

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 397
Author(s):  
Sandra Paszkiewicz ◽  
Izabela Irska ◽  
Agata Zubkiewicz ◽  
Anna Szymczyk ◽  
Elżbieta Piesowicz ◽  
...  
Keyword(s):  
Phase Transition ◽  
Shape Memory Polymer ◽  
Tensile Tests ◽  
Thermoplastic Elastomers ◽  
Sem Analysis ◽  
Transition Temperatures ◽  
Structure Property ◽  
Scanning Calorimetry ◽  
Molecular Weights ◽  
Phase Transition Temperatures

A series of poly(hexamethylene 2,5-furanodicarboxylate)-block-poly(tetrahydrofuran) (PHF-b-F-pTHF) copolymers were synthesized using a two-stage procedure, employing transesterification and polycondensation. The content of pTHF flexible segments varied from 25 to 75 wt.%. 1H nuclear magnetic resonance (NMR) and Fourier transformed infrared spectroscopy (FTIR) analyses were applied to confirm the molecular structure of the materials. Differential scanning calorimetry (DSC), dynamic mechanical measurements (DMTA), and X-ray diffraction (XRD) allowed characterizing the supramolecular structure of the synthesized copolymers. SEM analysis was applied to show the differences in the block copolymers’ morphologies concerning their chemical structure. The influence of the number of flexible segments in the copolymers on the phase transition temperatures, thermal properties, as well as the thermo-oxidative and thermal stability was analyzed. TGA analysis, along with tensile tests (static and cyclic), confirmed the utilitarian performance of the synthesized bio-based materials. It was found that an increase in the amount of pTHF caused the increase of both number-average and weight-average molecular weights and intrinsic viscosities, and at the same time causing the shift of the values of phase transition temperatures toward lower ones. Besides, PHF-b-F-pTHF containing 75 wt.% of F-pTHF units was proved to be a promising thermoplastic shape memory polymer (SMP) with a switching temperature of 20 °C.

Influence of compression aging on phase transition temperatures in single crystalline Ni-rich NiTi shape memory alloys

2004 ◽  
Vol 35 (5) ◽  
pp. 289-293 ◽  
Author(s):  
J. Michutta ◽  
A. Yawny ◽  
M. C. Carroll ◽  
Ch. Somsen ◽  
G. Eggeler
Keyword(s):  
Phase Transition ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Transition Temperatures ◽  
Single Crystalline ◽  
Phase Transition Temperatures ◽  
Niti Shape Memory Alloys

scholarly journals Thermal, ferroelastic, and structural properties near phase transitions of organic–inorganic perovskite type [NH3(CH2)3NH3]CdBr4 crystals

RSC Advances ◽  
2021 ◽  
Vol 11 (29) ◽  
pp. 17622-17629
Author(s):  
Ae Ran Lim
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Thermal Behavior ◽  
Structural Properties ◽  
Structural Dynamics ◽  
Transition Temperatures ◽  
Inorganic Perovskite ◽  
Phase Transition Temperatures ◽  
Perovskite Type

We studied the thermal behavior and structural dynamics of [NH3(CH2)3NH3]CdBr4 near phase transition temperatures.

Triply-responsive OEG-based microgels and hydrogels: Regulation of swelling ratio, volume phase transition temperatures and mechanical properties

2021 ◽  
Author(s):  
Dongdong Lu ◽  
Mingning Zhu ◽  
Jing Jin ◽  
Brian R. Saunders
Keyword(s):  
Phase Transition ◽  
Biomedical Engineering ◽  
Volume Phase Transition ◽  
Swelling Ratio ◽  
Transition Temperatures ◽  
Ph Responsive ◽  
Network Systems ◽  
Volume Phase ◽  
Phase Transition Temperatures ◽  
Volume Swelling

Thermally- and pH-responsive microgels (MGs) and hydrogels are fascinating network systems that have been applied in biomedical engineering and sensing. The volume-swelling ratio (Q) and the volume-phase transition temperatures (VPTTs)...

scholarly journals In Situ Generation of Green Hybrid Nanofibrillar Polymer-Polymer Composites—A Novel Approach to the Triple Shape Memory Polymer Formation

Polymers ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 1900
Author(s):  
Ramin Hosseinnezhad ◽  
Iurii Vozniak ◽  
Fahmi Zaïri
Keyword(s):  
Polymer Blends ◽  
Shape Memory ◽  
Shape Memory Polymer ◽  
Cellulose Nanofibers ◽  
Polymeric Materials ◽  
Novel Approach ◽  
Phase Transition Temperatures ◽  
Triple Shape Memory

The paper discusses the possibility of using in situ generated hybrid polymer-polymer nanocomposites as polymeric materials with triple shape memory, which, unlike conventional polymer blends with triple shape memory, are characterized by fully separated phase transition temperatures and strongest bonding between the polymer blends phase interfaces which are critical to the shape fixing and recovery. This was demonstrated using the three-component system polylactide/polybutylene adipateterephthalate/cellulose nanofibers (PLA/PBAT/CNFs). The role of in situ generated PBAT nanofibers and CNFs in the formation of efficient physical crosslinks at PLA-PBAT, PLA-CNF and PBAT-CNF interfaces and the effect of CNFs on the PBAT fibrillation and crystallization processes were elucidated. The in situ generated composites showed drastically higher values of strain recovery ratios, strain fixity ratios, faster recovery rate and better mechanical properties compared to the blend.

scholarly journals Investigating phase transition temperatures of size separated gadolinium silicide magnetic nanoparticles

AIP Advances ◽  
2018 ◽  
Vol 8 (5) ◽  
pp. 056428 ◽  
Author(s):  
Shivakumar G. Hunagund ◽  
Shane M. Harstad ◽  
Ahmed A. El-Gendy ◽  
Shalabh Gupta ◽  
Vitalij K. Pecharsky ◽  
...  
Keyword(s):  
Phase Transition ◽  
Magnetic Nanoparticles ◽  
Transition Temperatures ◽  
Phase Transition Temperatures

Isotope effect on displacive-type ferroelectric-phase-transition temperatures

1990 ◽  
Vol 41 (13) ◽  
pp. 9581-9584 ◽  
Author(s):  
A. Bussmann-Holder ◽  
H. Büttner
Keyword(s):  
Phase Transition ◽  
Isotope Effect ◽  
Ferroelectric Phase Transition ◽  
Ferroelectric Phase ◽  
Transition Temperatures ◽  
Phase Transition Temperatures ◽  
Displacive Type
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