Surface Attached Polymer Networks through Thermally Induced Cross-Linking of Sulfonyl Azide Group Containing Polymers

2008 ◽  
Vol 41 (23) ◽  
pp. 9284-9289 ◽  
Author(s):  
Kerstin Schuh ◽  
Oswald Prucker ◽  
Jürgen Rühe
Keyword(s):  
Polymer Networks ◽  
Cross Linking ◽  
Azide Group ◽  
Thermally Induced ◽  
Sulfonyl Azide

scholarly journals Thermally-Induced Shape-Memory Behavior of Degradable Gelatin-Based Networks

2021 ◽  
Vol 22 (11) ◽  
pp. 5892
Author(s):  
Axel T. Neffe ◽  
Candy Löwenberg ◽  
Konstanze K. Julich-Gruner ◽  
Marc Behl ◽  
Andreas Lendlein
Keyword(s):  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Shape Recovery ◽  
Polymer Networks ◽  
Water Soluble ◽  
Compression Tests ◽  
Thermally Induced ◽  
Thermomechanical Process ◽  
Triple Helices

Shape-memory hydrogels (SMH) are multifunctional, actively-moving polymers of interest in biomedicine. In loosely crosslinked polymer networks, gelatin chains may form triple helices, which can act as temporary net points in SMH, depending on the presence of salts. Here, we show programming and initiation of the shape-memory effect of such networks based on a thermomechanical process compatible with the physiological environment. The SMH were synthesized by reaction of glycidylmethacrylated gelatin with oligo(ethylene glycol) (OEG) α,ω-dithiols of varying crosslinker length and amount. Triple helicalization of gelatin chains is shown directly by wide-angle X-ray scattering and indirectly via the mechanical behavior at different temperatures. The ability to form triple helices increased with the molar mass of the crosslinker. Hydrogels had storage moduli of 0.27–23 kPa and Young’s moduli of 215–360 kPa at 4 °C. The hydrogels were hydrolytically degradable, with full degradation to water-soluble products within one week at 37 °C and pH = 7.4. A thermally-induced shape-memory effect is demonstrated in bending as well as in compression tests, in which shape recovery with excellent shape-recovery rates Rr close to 100% were observed. In the future, the material presented here could be applied, e.g., as self-anchoring devices mechanically resembling the extracellular matrix.

Spectroscopic Study on the Structural Differences of Thermally Induced Cross-Linking Segments in Emeraldine Salt and Base Forms of Polyaniline

2012 ◽  
Vol 116 (48) ◽  
pp. 14191-14200 ◽  
Author(s):  
Marcelo M. Nobrega ◽  
Claudio H. B. Silva ◽  
Vera R. L. Constantino ◽  
Marcia L. A. Temperini
Keyword(s):  
Spectroscopic Study ◽  
Cross Linking ◽  
Emeraldine Salt ◽  
Thermally Induced ◽  
Structural Differences

Emissive Semi-Interpenetrating Polymer Networks for Ink-Jet Printed Multilayer OLEDs

2021 ◽  
Author(s):  
Susanna V. Kunz ◽  
Cameron M. Cole ◽  
Thomas Baumann ◽  
Prashant Murlidhar Sonar ◽  
Soniya Yambem ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Polymer Networks ◽  
Interpenetrating Polymer Networks ◽  
Organic Light Emitting Diodes ◽  
Cross Linking ◽  
Solution Processing ◽  
Light Emitting ◽  
Polymer Precursors ◽  
Organic Light ◽  
Ink Jet

Solution-processing of multilayered Organic Light Emitting Diodes (OLEDs) remains a challenge that is often addressed by cross-linking polymer precursors into insoluble networks. Herein, we blend an emissive polymer carrying a...

Thermally induced chemical cross-linking reinforced fluorinated polyurethane/polyacrylonitrile/polyvinyl butyral nanofibers for waterproof-breathable application

RSC Advances ◽  
2016 ◽  
Vol 6 (35) ◽  
pp. 29629-29637 ◽  
Author(s):  
Junlu Sheng ◽  
Min Zhang ◽  
Wenjing Luo ◽  
Jianyong Yu ◽  
Bin Ding
Keyword(s):  
Polyvinyl Butyral ◽  
Cross Linking ◽  
Thermally Induced ◽  
Fluorinated Polyurethane ◽  
Nanofibrous Membranes ◽  
Chemical Cross Linking

Thermally induced chemical cross-linking could enhance the FPAN/PVB/BIP composite nanofibrous membranes with robust mechanical, waterproof and breathable performance.

Depolymerizable, adaptive supramolecular polymer nanoparticles and networks

2014 ◽  
Vol 5 (12) ◽  
pp. 3788-3794 ◽  
Author(s):  
Joshua A. Kaitz ◽  
Catherine M. Possanza ◽  
Yang Song ◽  
Charles E. Diesendruck ◽  
A. Jolanda H. Spiering ◽  
...  
Keyword(s):  
Polymeric Nanoparticles ◽  
Polymer Networks ◽  
Polymer Nanoparticles ◽  
Cross Linking ◽  
Supramolecular Polymer ◽  
Single Chain ◽  
Degradable Polymer

Depolymerizable polymers are appended with supramolecular cross-linking motifs to enable preparation of tunable single-chain polymeric nanoparticles and degradable polymer networks.

Alterations in Physical Cross-Linking Modulate Mechanical Properties of Two-Phase Protein Polymer Networks

2005 ◽  
Vol 6 (6) ◽  
pp. 3037-3044 ◽  
Author(s):  
Xiaoyi Wu ◽  
Rory Sallach ◽  
Carolyn A. Haller ◽  
Jeffrey A. Caves ◽  
Karthik Nagapudi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Polymer Networks ◽  
Cross Linking ◽  
Two Phase ◽  
Protein Polymer ◽  
Phase Protein
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