scholarly journals A Structural Approach to Establishing a Platform Chemistry for the Tunable, Bulk Electron Beam Cross-Linking of Shape Memory Polymer Systems

2013 ◽  
Vol 46 (22) ◽  
pp. 8905-8916 ◽  
Author(s):  
Keith Hearon ◽  
Celine J. Besset ◽  
Alexander T. Lonnecker ◽  
Taylor Ware ◽  
Walter E. Voit ◽  
...  
Keyword(s):  
Electron Beam ◽  
Shape Memory ◽  
Shape Memory Polymer ◽  
Structural Approach ◽  
Cross Linking ◽  
Polymer Systems

scholarly journals Design of Shape Memory Thermoplastic Material Systems for FDM-Type Additive Manufacturing

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4254
Author(s):  
Paulina A. Quiñonez ◽  
Leticia Ugarte-Sanchez ◽  
Diego Bermudez ◽  
Paulina Chinolla ◽  
Rhyan Dueck ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Shape Memory ◽  
Thermomechanical Processing ◽  
Material Selection ◽  
Shape Memory Polymer ◽  
Fused Filament Fabrication ◽  
Materials Development ◽  
Thermoplastic Material ◽  
Polymer Systems ◽  
Injection Molded

The work presented here describes a paradigm for the design of materials for additive manufacturing platforms based on taking advantage of unique physical properties imparted upon the material by the fabrication process. We sought to further investigate past work with binary shape memory polymer blends, which indicated that phase texturization caused by the fused filament fabrication (FFF) process enhanced shape memory properties. In this work, two multi-constituent shape memory polymer systems were developed where the miscibility parameter was the guide in material selection. A comparison with injection molded specimens was also carried out to further investigate the ability of the FFF process to enable enhanced shape memory characteristics as compared to other manufacturing methods. It was found that blend combinations with more closely matching miscibility parameters were more apt at yielding reliable shape memory polymer systems. However, when miscibility parameters differed, a pathway towards the creation of shape memory polymer systems capable of maintaining more than one temporary shape at a time was potentially realized. Additional aspects related to impact modifying of rigid thermoplastics as well as thermomechanical processing on induced crystallinity are also explored. Overall, this work serves as another example in the advancement of additive manufacturing via materials development.

Physical Microfabrication of Shape-Memory Polymer Systems via Bicomponent Fiber Spinning

2016 ◽  
Vol 37 (22) ◽  
pp. 1837-1843 ◽  
Author(s):  
Syamal S. Tallury ◽  
Behnam Pourdeyhimi ◽  
Melissa A. Pasquinelli ◽  
Richard J. Spontak
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymer ◽  
Fiber Spinning ◽  
Polymer Systems ◽  
Bicomponent Fiber

scholarly journals Development of siloxane-based amphiphiles as cell stabilizers for porous shape memory polymer systems

2016 ◽  
Vol 478 ◽  
pp. 334-343 ◽  
Author(s):  
Sayyeda M. Hasan ◽  
Alexandra D. Easley ◽  
Mary Beth Browning Monroe ◽  
Duncan J. Maitland
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymer ◽  
Polymer Systems

scholarly journals Photothermal-Triggered Shape Memory Polymer Prepared by Cross-Linking Porphyrin-Loaded Micellar Particles

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 496 ◽  
Author(s):  
Wangqiu Qian ◽  
Yufang Song ◽  
Dongjian Shi ◽  
Weifu Dong ◽  
Xiaorong Wang ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Shape Memory ◽  
Shape Memory Polymer ◽  
Red Light ◽  
Photothermal Effect ◽  
Cross Linking ◽  
Amphiphilic Macromolecules ◽  
Potential Applications ◽  
Biomedical Field ◽  
Biomedical Treatment

In this work, we fabricated porphyrin-loaded shape memory polymer (SMP) film by cross-linking micellar particles prepared by co-assembly of porphyrin compounds and amphiphilic macromolecules formulated by copolymerization of 2-butoxy ethanol (BCS), methyl methacrylate (MMA), butyl acrylate (BA) acrylic acid (AA), and diacetone acrylamide (DAAM). The experimental results revealed that this film was able to respond to the red light in terms of photothermal effect enabled by the porphyrin filler. The photothermal-triggered shape memory behaviors of the film were further examined in detail. It was noteworthy that this material was expected to have potential applications in the biomedical field due to the excellent biocompatibility of the porphyrin filler and the red-light source, which was optimal and safe enough for biomedical treatment.

Mechanical Behavior of a Shape Memory Polymer

2006 ◽  
Author(s):  
Xin Wu ◽  
Leonard Dauerman ◽  
Song Zhang ◽  
Xiao Qiao ◽  
Jose Mabesa
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymer ◽  
Isothermal Holding ◽  
Strain Recovery ◽  
Control Mode ◽  
Plastic Behavior ◽  
Polymer Systems ◽  
Potential Applications ◽  
Number Of Cycles ◽  
Holding Temperature

In recent years shape memory effect in polymer systems has drawn great attention for its potential applications for MEMS and medical devices. In this paper, the visco-elastic and plastic behavior and strain recovery characteristics of a thermoplastic have been studied extensively. Creep deformation by compression was performed under load or displacement control mode, and under monotonic or cyclic loading. The strain recovery ratio of the shape memory polymer is found to be strongly affected by the deformation temperature, isothermal holding temperature and time, amount of forward strain and relaxation time, and the number of cycles of strain/recovery. The creep behavior of the material is modeled.

Solution-Responsive Shape-Memory Polymer Driven by Forming Hydrogen Bonding

2008 ◽  
Vol 47-50 ◽  
pp. 258-261 ◽  
Author(s):  
Hai Bao Lv ◽  
Yan Ju Liu ◽  
Dong Xing Zhang ◽  
Jin Song Leng ◽  
Shan Yi Du
Keyword(s):  
Hydrogen Bonding ◽  
Shape Memory ◽  
Shape Recovery ◽  
Shape Memory Polymer ◽  
Polymeric Materials ◽  
Experimental Result ◽  
New Approach ◽  
Polymer Systems ◽  
Main Challenge ◽  
Bonding Interaction

Recently, there is interest in triggering shape recovery of shape-memory polymers(SMPs) by novel non-external heating. In this paper, many hard works have been carried out to make SMP induced by solution. The main challenge in the development of such polymer systems is the conversion of solution-induced effects at the molecular level to macroscopic movement of working pieces. This paper presents a systematic study on the effects of solution on the glass transition temperature (Tg). The results reveal that the hydrogen bonding of shape memory polymer (SMP) was aroused by the absorbed solution that significantly reduces Tg of polymer. The mechanism behind it is solution firstly intenerates polymeric materials till the Tg of polymer lowered down to the temperature of ambient, then hydrogen bonding interaction improves the flexibility of polymeric macro-molecular chains. Thus, the shape memory effect (SME) can undergo solution-driven shape recovery. In addition, it provides a new approach that the SMP can be induced by applying non-energy stimulus. The Dynamic Mechanical Analyzer (DMA) results reveal that the modulus of polymer was softened gradually with immersion time increasing. The experimental result is approximate to the theory.

Influence of cross-linking agent on thermomechanical properties and shape memory effect of styrene shape memory polymer

2011 ◽  
Vol 22 (18) ◽  
pp. 2147-2154 ◽  
Author(s):  
Dawei Zhang ◽  
Yanju Liu ◽  
Kai Yu ◽  
Jinsong Leng
Keyword(s):  
Glass Transition ◽  
Shape Memory ◽  
Shape Memory Polymer ◽  
Radical Reaction ◽  
Thermomechanical Properties ◽  
Cross Linking ◽  
Free Radical Reaction ◽  
Original Shape ◽  
The Cross ◽  
Recovery Angle

The influence of cross-linking agent content on thermomechanical properties and shape recovery behavior of thermoset styrene shape memory polymer (SMP) was investigated in this article. The SMP was polymerized by free radical reaction, with styrene and butyl acrylate as comonomers and divinylbenzene as the cross-linking agent. When the cross-linking agent content is increased from 1 to 4 wt%, the storage modulus and the glass transition temperature ( Tg) of the SMP increased correspondingly. During the glass transition, while the value of damping peak decreased as a result of the addition of the cross-linking agent, the peak width increased, and the main relaxation activation energy increased by 48.6%. When the active temperature was higher than or equal to Tg, the SMP samples containing different weight percentages of the cross-linking agent could recover their original shape. At or above Tg, SMP with varied fractions of cross-linking agent could completely recover its original shape; the recovery rate of SMP increased with the increase in the contents of the cross-linking agent. Below Tg, SMP could not recover its original shape, but the recovery angle increased as the contents of cross-linking agent increased. These results were attributed to the increase of cross-linking densities as a result of the addition of cross-linking agent.

Multidirectional Triple-Shape-Memory Polymer by Tunable Cross-linking and Crystallization

2020 ◽  
Vol 12 (5) ◽  
pp. 6426-6435 ◽  
Author(s):  
Ming Tian ◽  
Weisheng Gao ◽  
Jing Hu ◽  
Xiaowei Xu ◽  
Nanying Ning ◽  
...  
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymer ◽  
Cross Linking ◽  
Triple Shape Memory
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