Modified shape memory cyanate polymers with a wide range of high glass transition temperatures

2012 ◽  
Author(s):  
Fang Xie ◽  
Longnan Huang ◽  
Yanju Liu ◽  
Jinsong Leng
Keyword(s):  
Glass Transition ◽  
Shape Memory ◽  
Transition Temperatures ◽  
Glass Transition Temperatures ◽  
Wide Range

scholarly journals Epoxy Resin Composite Bilayers with Triple-Shape Memory Effect

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Xixi Li ◽  
Yaofeng Zhu ◽  
Yubing Dong ◽  
Meng Liu ◽  
Qingqing Ni ◽  
...  
Keyword(s):  
Glass Transition ◽  
Electron Microscope ◽  
Shape Memory ◽  
Memory Effects ◽  
Epoxy Composites ◽  
Transition Temperatures ◽  
Glass Transition Temperatures ◽  
Shape Memory Effects ◽  
Triple Shape Memory ◽  
Nanosilica Particles

Triple-shape memory epoxy composites with bilayer structures of well-separated glass transition temperatures have been successfully prepared. The different glass transition temperatures of the epoxy composites were obtained by physically incorporating various amounts of nanosilica particles, which were introduced into the epoxy by utilizing polyethylene glycol. A scanning electron microscope and a transmission electron microscope were used to analyze the dispersibility of the nanosilica particles. The effects of nanosilica particles on the mechanical properties as well as on the dual-shape memory effects (DSME) and triple-shape memory effects (TSME) of the nanocomposites were studied. The nanosilica particles were homogenously dispersed in the matrix and well incorporated into the epoxy matrix. The resulting nanocomposites exhibited excellent TSME, and their shape fixity properties were significantly improved by nanosilica particles.

scholarly journals Advances in Internal Plasticization of PVC: Copper-Mediated Atom-Transfer Radical Polymerization from PVC Defect Sites To Form Acrylate Graft Copolymers

Synlett ◽  
2021 ◽  
Author(s):  
Rebecca Braslau ◽  
Longbo Li ◽  
Yanika Schneider ◽  
Adrienne B. Hoeglund
Keyword(s):  
Glass Transition ◽  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Simple Procedure ◽  
Covalent Attachment ◽  
Atom Transfer ◽  
Transition Temperatures ◽  
Glass Transition Temperatures ◽  
Defect Sites ◽  
Wide Range

AbstractInternally plasticized PVC copolymers were prepared by grafting PVC with butyl acrylate and 2-(2-ethoxyethoxy)ethyl acrylate by atom-transfer radical polymerization, resulting in well-behaved polymers with a wide range of glass transition temperatures (–54 °C to 54 °C). When the grafted side chains made up more than 50% of the polymer by weight, the glass transition temperatures were below 0 °C. The covalent attachment of the plasticizing grafts requires one simple procedure starting from commercial PVC, making this strategy an industrially relevant and environmentally friendly alternative to the use of conventional small-molecule plasticizers.

Multiple shape memory polymers for self-deployable device

RSC Advances ◽  
2016 ◽  
Vol 6 (56) ◽  
pp. 50581-50586 ◽  
Author(s):  
Shuyun Zhuo ◽  
Gongzheng Zhang ◽  
Xianqi Feng ◽  
Haoyang Jiang ◽  
Jinli Shi ◽  
...  
Keyword(s):  
Glass Transition ◽  
Shape Memory ◽  
Shape Memory Polymers ◽  
Transition Temperatures ◽  
Glass Transition Temperatures

Three-segments MH copolymers with well-separated glass transition temperatures can subsequently change their shapes in a pre-defined way.

Free Recovery Effects of Shape-Memory Polymers for Cardiovascular Stents

2005 ◽  
Vol 898 ◽  
Author(s):  
Christopher Michael Yakacki ◽  
Robin Shandas ◽  
Craig Lanning ◽  
Ken Gall
Keyword(s):  
Glass Transition ◽  
Shape Memory ◽  
Polymer Networks ◽  
Transition Temperatures ◽  
Poly Ethylene Glycol ◽  
Glass Transition Temperatures ◽  
Cardiovascular Stents ◽  
Geometrical Features ◽  
Poly Ethylene ◽  
Free Strain

AbstractThe shape-memory effect was examined in polymer stents intended for cardiovascular applications. Four polymer networks were synthesized from poly(ethylene glycol) dimethacrylate and tert-butyl acrylate with 10 wt% and 20 wt% crosslinker, and with glass transition temperatures (Tg) of 52°C and 55°C. Solid and 50% porous stents were manufactured and tested for free strain recoverability at temperatures at or just above 37°C. Stents with lower glass transition temperatures and a higher degree of crosslinking recovered faster than their counterparts. Lower deformation (packaging) temperatures and higher recovery temperatures induce more rapid recovery. The presence of geometrical features, such as pores, initiated recovery sooner, but had negligible influence on overall recovery.

Shape-Memory Polymers with Adjustable High Glass Transition Temperatures

2015 ◽  
Vol 48 (11) ◽  
pp. 3582-3589 ◽  
Author(s):  
Xinli Xiao ◽  
Deyan Kong ◽  
Xueying Qiu ◽  
Wenbo Zhang ◽  
Fenghua Zhang ◽  
...  
Keyword(s):  
Glass Transition ◽  
Shape Memory ◽  
Shape Memory Polymers ◽  
Transition Temperatures ◽  
Glass Transition Temperatures
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