Thermally Induced Cross-Linking of Polymers via C,H Insertion Cross-Linking (CHic) under Mild Conditions

2021 ◽  
Author(s):  
Jonas Kost ◽  
Alexander Bleiziffer ◽  
Dennis Rusitov ◽  
Jürgen Rühe
Keyword(s):  
Cross Linking ◽  
Thermally Induced ◽  
Mild Conditions

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

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.

scholarly journals Functionalization of polyhydromethylsiloxane with nitrogen-containing organic compounds

2021 ◽  
Vol 28 (5) ◽  
Author(s):  
Maria Owińska ◽  
Aleksandra Chechelska-Noworyta ◽  
Zbigniew Olejniczak ◽  
Magdalena Hasik
Keyword(s):  
Nmr Spectroscopy ◽  
Ftir Spectroscopy ◽  
Organic Compounds ◽  
Elemental Analysis ◽  
Functionalized Polymers ◽  
Cross Linking ◽  
Hydrosilylation Reaction ◽  
Silanol Groups ◽  
Mild Conditions ◽  
Hydrolysis Of

AbstractLinear polyhydromethylsiloxane (PHMS) was functionalized with nitrogen-containing organic compounds: N-allylaniline (Naa), N-allylcyclohexylamine (Nach), N-allylpiperidine (Nap) and 4-vinylpyridine (4VP) via hydrosilylation reaction in the presence of Pt0 complex (Karstedt’s catalyst) under mild conditions. Reaction course was followed by FTIR spectroscopy and final hydrosilylation products were characterized by FTIR, 1H, 29Si NMR and 29Si MAS-NMR spectroscopies as well as by elemental analysis. Results showed that functionalization of PHMS with N-allyl amines took place but in none of the systems it was complete. Hydrosilylation of Naa, Nach and Nap with PHMS led both, to the β and α addition products. 29Si NMR spectroscopy showed unequivocally that the reaction of PHMS with 4VP did not occur and the only reactions in the systems were hydrolysis of Si–H groups of PHMS followed by condensation of the silanol groups resulting in cross-linking of the polymer. All the functionalized polymers studied in the work contained reactive amine moieties prone to further modifications, therefore exhibit a great potential for various applications.

Thermally Induced Cross-Linking and Degradation Reactions of Benzocyclobutene-Based Polymers

2017 ◽  
Vol 50 (6) ◽  
pp. 2304-2319 ◽  
Author(s):  
Anthony P. Gies ◽  
Liam Spencer ◽  
Nathan J. Rau ◽  
Praveenkumar Boopalachandran ◽  
Mark A. Rickard ◽  
...  
Keyword(s):  
Cross Linking ◽  
Thermally Induced ◽  
Degradation Reactions

Thermally induced N–S bond insertion reaction of diazo compounds with N-sulfenylsuccinimides: synthesis of sulfides and mechanism studies

2018 ◽  
Vol 16 (1) ◽  
pp. 70-76 ◽  
Author(s):  
Xiaolu Zhang ◽  
Yang Zheng ◽  
Lihua Qiu ◽  
Xinfang Xu
Keyword(s):  
Diazo Compounds ◽  
Insertion Reaction ◽  
Thermally Induced ◽  
Metal Free ◽  
Mild Conditions ◽  
Insertion Process ◽  
Functionalization Reaction

A metal-free gem-functionalization reaction of diazo compounds via a formal N–S bond insertion process under mild conditions is presented.

scholarly journals Diazo-Based Copolymers for the Wet Strength Improvement of Paper Based on Thermally Induced CH-Insertion Cross-Linking

2021 ◽  
Author(s):  
Simon Schölch ◽  
Jan-Lukas Schäfer ◽  
Tobias Meckel ◽  
Thomas Brandstetter ◽  
Markus Biesalski ◽  
...  
Keyword(s):  
Cross Linking ◽  
Wet Strength ◽  
Thermally Induced ◽  
Strength Improvement

scholarly journals Cytocompatible in situ cross-linking of degradable LbL films based on thiol–exchange reaction

2015 ◽  
Vol 6 (8) ◽  
pp. 4698-4703 ◽  
Author(s):  
Sung Ho Yang ◽  
Jinsu Choi ◽  
L. Palanikumar ◽  
Eun Seong Choi ◽  
Juno Lee ◽  
...  
Keyword(s):  
Exchange Reaction ◽  
Cross Linking ◽  
Mild Conditions ◽  
Lbl Films ◽  
Thiol Exchange

A highly cytocompatible LbL process was developed, based on the thiol–exchange reaction, for forming in situ cross-linked and degradable films under physiologically mild conditions.

Reprocessing Cross-linked Polyurethanes by Catalyzing Carbamate Exchange

2019 ◽  
Author(s):  
David J. Fortman ◽  
Daylan T. Sheppard ◽  
William Dichtel
Keyword(s):  
Environmental Impact ◽  
Lewis Acid ◽  
Compression Molding ◽  
Cross Linking ◽  
Acid Catalysts ◽  
Lewis Acid Catalysts ◽  
Mild Conditions ◽  
Cross Links ◽  
Synthesized Materials

<div> <div> <div> <p>The reprocessing or recycling of cross-linked polymers by incorporating dynamic covalent cross- links has the potential to increase their usable lifetimes and reduce their environmental impact. Polyurethanes (PUs) are the largest class of cross-linked polymers; however, their direct recycling into similar value materials is not well-developed. We demonstrate that several Lewis acid catalysts mediate urethane exchange selectively and under mild conditions. Incorporating these catalysts into cross-linked polyether and polyester PUs with structures similar to commercial PU thermosets gives cross-linked materials that can completely relax stress in 100 seconds at temperatures as low as 140 oC. The dynamic polymers were reprocessed via compression molding to provide materials with similar cross-linking densities to as-synthesized materials. Because these systems are based on commercially available PU monomers and inexpensive Lewis acid catalysts, we anticipate that these findings will enable the recycling of traditional thermosetting PUs. </p> </div> </div> </div>

Reprocessing Cross-linked Polyurethanes by Catalyzing Carbamate Exchange

2019 ◽  
Author(s):  
David J. Fortman ◽  
Daylan T. Sheppard ◽  
William Dichtel
Keyword(s):  
Environmental Impact ◽  
Lewis Acid ◽  
Compression Molding ◽  
Cross Linking ◽  
Acid Catalysts ◽  
Lewis Acid Catalysts ◽  
Mild Conditions ◽  
Cross Links ◽  
Synthesized Materials

<div> <div> <div> <p>The reprocessing or recycling of cross-linked polymers by incorporating dynamic covalent cross- links has the potential to increase their usable lifetimes and reduce their environmental impact. Polyurethanes (PUs) are the largest class of cross-linked polymers; however, their direct recycling into similar value materials is not well-developed. We demonstrate that several Lewis acid catalysts mediate urethane exchange selectively and under mild conditions. Incorporating these catalysts into cross-linked polyether and polyester PUs with structures similar to commercial PU thermosets gives cross-linked materials that can completely relax stress in 100 seconds at temperatures as low as 140 oC. The dynamic polymers were reprocessed via compression molding to provide materials with similar cross-linking densities to as-synthesized materials. Because these systems are based on commercially available PU monomers and inexpensive Lewis acid catalysts, we anticipate that these findings will enable the recycling of traditional thermosetting PUs. </p> </div> </div> </div>

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