Thermolyzable polymer networks and star polymers containing a novel, compact, degradable acylal-based dimethacrylate cross-linker: Synthesis, characterization, and thermolysis

2007 ◽  
Vol 45 (24) ◽  
pp. 5811-5823 ◽  
Author(s):  
Efrosyni Themistou ◽  
Amelia Kanari ◽  
Costas S. Patrickios
Keyword(s):  
Polymer Networks ◽  
Star Polymers ◽  
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scholarly journals Hydrogel Functionalized Polyester Fabrics by UV-Induced Photopolymerization

Polymers ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1329 ◽  
Author(s):  
Emanuela Lorusso ◽  
Wael Ali ◽  
Marcus Hildebrandt ◽  
Thomas Mayer-Gall ◽  
Jochen S. Gutmann
Keyword(s):  
Functional Groups ◽  
Polyethylene Terephthalate ◽  
Abrasion Resistance ◽  
Chemical Nature ◽  
Low Cost ◽  
Polymer Networks ◽  
Acrylate Monomer ◽  
Polyester Fabrics ◽  
Grafted Polymer ◽  
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We address a strategy to graft hydrogels onto polyethylene terephthalate (PET) fabrics using different acrylate-based monomers. The hydrogel-modified fabrics were prepared by a two-step modification. To this end, double functional groups were firstly introduced onto the PET surface via an aminolysis reaction involving allylamine. The final grafted polymer networks were then obtained after UV-induced radical photopolymerization by varying acrylate monomer types in the presence of a cross-linker. After characterization, the resulting hydrogels showed different morphologies and abrasion resistance performances depending on their chemical nature. UV-photopolymerization is a fast and low-cost method to achieve technical fabrics with specific desired properties.

Thermo-mechanical Behavior of (Meth)Acrylate Shape-Memory Polymer Networks

2011 ◽  
Vol 1312 ◽  
Author(s):  
Carl P. Frick ◽  
Nishant Lakhera ◽  
Christopher M. Yakacki
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymer ◽  
Polymer Network ◽  
Polymer Networks ◽  
Weight Fraction ◽  
Crosslinking Density ◽  
Mechanical Stiffness ◽  
Actuation Force ◽  
Order Of Magnitude ◽  
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ABSTRACTOur overall approach is based on developing a photocrosslinkable polymer network with a favorable shape-memory response, using polymer chemistry and crosslinking density to control thermo-mechanical properties. Three polymer networks were created and thermo-mechanically tested, each from tert-Butyl acrylate linear builder co-polymerized with a poly(ethylene glycol) dimethacrylate cross-linker. By systematically altering the molecular weight and the weight fraction of the cross-linker, it was possible to create three polymers that exhibited the same glass transition temperature, but varied by almost an order of magnitude in rubbery modulus. Therefore, the mechanical stiffness could be tailored to suit a given application. Recovery behavior of the polymers was characterized over a range of deformation temperatures. It has been implicitly assumed a linear relationship between Free-Strain (i.e. no actuation force) and Fixed-Stress (i.e. maximum actuation force), however, this has never been confirmed experimentally. The energy per unit volume performed by the shape-memory polymer was quantified, and observed to be a function of strain recovered. The maximum recoverable work was shown to increase with cross-linking density, although the overall efficiency is similar for all materials tested.

Visualization and Quantitative Evaluation of Toughening Polymer Networks by a Sacrificial Dynamic Cross-Linker with Mechanochromic Properties

2020 ◽  
Vol 9 (8) ◽  
pp. 1108-1113 ◽  
Author(s):  
Hio Sakai ◽  
Daisuke Aoki ◽  
Kota Seshimo ◽  
Koichi Mayumi ◽  
Shotaro Nishitsuji ◽  
...  
Keyword(s):  
Quantitative Evaluation ◽  
Polymer Networks ◽  
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