Synthesis of solvent-free acrylic pressure-sensitive adhesives via visible-light-driven photocatalytic radical polymerization without additives

2020 ◽  
Vol 22 (23) ◽  
pp. 8289-8297
Author(s):  
Jong-Ho Back ◽  
Yonghwan Kwon ◽  
Juan Carlos Roldao ◽  
Youngchang Yu ◽  
Hyun-Joong Kim ◽  
...  
Keyword(s):  
Free Radical ◽  
Visible Light ◽  
Radical Polymerization ◽  
Free Radical Polymerization ◽  
Solvent Free ◽  
Vinyl Monomers ◽  
Quantum Calculations ◽  
Pressure Sensitive Adhesives ◽  
Pressure Sensitive ◽  
Visible Light Driven

Solvent-free acrylic pressure-sensitive adhesives were prepared via visible-light driven photocatalytic free radical polymerization. Combined experiments and quantum calculations divulged the origin of the enhanced rate of polymerisation in the presence of N-vinyl monomers.

scholarly journals Visible-Light-Curable Solvent-Free Acrylic Pressure-Sensitive Adhesives via Photoredox-Mediated Radical Polymerization

Molecules ◽  
2021 ◽  
Vol 26 (2) ◽  
pp. 385
Author(s):  
Jong-Ho Back ◽  
Yonghwan Kwon ◽  
Hyun-Joong Kim ◽  
Youngchang Yu ◽  
Wonjoo Lee ◽  
...  
Keyword(s):  
Visible Light ◽  
Radical Polymerization ◽  
Uv Light ◽  
General Purpose ◽  
Solvent Free ◽  
Excitation Source ◽  
Pressure Sensitive Adhesives ◽  
Pressure Sensitive ◽  
Resistance To Oxidation ◽  
Visible Light Driven

Owing to their excellent properties, such as transparency, resistance to oxidation, and high adhesivity, acrylic pressure-sensitive adhesives (PSAs) are widely used. Recently, solvent-free acrylic PSAs, which are typically prepared via photopolymerization, have attracted increasing attention because of the current strict environmental regulations. UV light is commonly used as an excitation source for photopolymerization, whereas visible light, which is safer for humans, is rarely utilized. In this study, we prepared solvent-free acrylic PSAs via visible light-driven photoredox-mediated radical polymerization. Three α-haloesters were used as additives to overcome critical shortcomings, such as the previously reported low film curing rate and poor transparency observed during additive-free photocatalytic polymerization. The film curing rate was greatly increased in the presence of α-haloesters, which lowered the photocatalyst loadings and, hence, improved the film transparency. These results confirmed that our method could be widely used to prepare general-purpose solvent-free PSAs—in particular, optically clear adhesives for electronics.

scholarly journals Panchromatic Copper Complexes for Visible Light Photopolymerization

Photochem ◽  
2021 ◽  
Vol 1 (2) ◽  
pp. 167-189
Author(s):  
Alexandre Mau ◽  
Guillaume Noirbent ◽  
Céline Dietlin ◽  
Bernadette Graff ◽  
Didier Gigmes ◽  
...  
Keyword(s):  
Free Radical ◽  
Visible Light ◽  
Radical Polymerization ◽  
Copper Complexes ◽  
Free Radical Polymerization ◽  
Photoluminescence Properties ◽  
System Formation ◽  
Iodonium Salt ◽  
Visible Light Photopolymerization ◽  
Cationic Polymerizations

In this work, eleven heteroleptic copper complexes were designed and studied as photoinitiators of polymerization in three-component photoinitiating systems in combination with an iodonium salt and an amine. Notably, ten of them exhibited panchromatic behavior and could be used for long wavelengths. Ferrocene-free copper complexes were capable of efficiently initiating both the radical and cationic polymerizations and exhibited similar performances to that of the benchmark G1 system. Formation of acrylate/epoxy IPNs was also successfully performed even upon irradiation at 455 nm or at 530 nm. Interestingly, all copper complexes containing the 1,1′-bis(diphenylphosphino)ferrocene ligand were not photoluminescent, evidencing that ferrocene could efficiently quench the photoluminescence properties of copper complexes. Besides, these ferrocene-based complexes were capable of efficiently initiating free radical polymerization processes. The ferrocene moiety introduced in the different copper complexes affected neither their panchromatic behaviors nor their abilities to initiate free radical polymerizations.

Blue Light Driven Free-Radical Polymerization using Arylazo Sulfones as Initiators

2021 ◽  
Author(s):  
Andrea Nitti ◽  
Angelo Martinelli ◽  
Fabrice Batteux ◽  
Stefano Protti ◽  
Maurizio Fagnoni ◽  
...  
Keyword(s):  
Free Radical ◽  
Visible Light ◽  
Radical Polymerization ◽  
Blue Light ◽  
Room Temperature ◽  
Free Radical Polymerization

The polymerization of a broad range of electron-poor olefins has been achieved under free-radical conditions by using arylazo sulfones as visible light photoinitiators. The process proceeds smoothly at room temperature...

Comments on the Analysis of Copolymers of C60with Vinyl Monomers Obtained by Free Radical Polymerization

1997 ◽  
Vol 30 (23) ◽  
pp. 7351-7354 ◽  
Author(s):  
Padma L. Nayak ◽  
Shridhara Alva ◽  
Ke Yang ◽  
Pradeep K. Dhal ◽  
Jayant Kumar ◽  
...  
Keyword(s):  
Free Radical ◽  
Radical Polymerization ◽  
Free Radical Polymerization ◽  
Vinyl Monomers

scholarly journals New 1,8-Naphthalimide Derivatives as Photoinitiators for Free-Radical Polymerization Upon Visible Light

Catalysts ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 637 ◽  
Author(s):  
Aude-Héloïse Bonardi ◽  
Soraya Zahouily ◽  
Céline Dietlin ◽  
Bernadette Graff ◽  
Fabrice Morlet-Savary ◽  
...  
Keyword(s):  
Free Radical ◽  
Visible Light ◽  
Radical Polymerization ◽  
Light Exposure ◽  
Free Radical Polymerization ◽  
Thermal Processes ◽  
Light Emitting ◽  
Chemical Mechanisms ◽  
Full Picture ◽  
Methacrylate Monomers

Photopolymerization processes, and especially those carried out under visible light, are more and more widespread for their multiple advantages compared to thermal processes. In the present paper, new 1,8-naphthalimide derivatives are proposed as photoinitiators for free-radical polymerization upon visible light exposure using light-emitting diodes (LEDs) at 395, 405, and 470 nm. These photoinitiators are used in combination with both iodonium salts and phosphine. The synthesis of these compounds as well as their excellent polymerization initiation ability for methacrylate monomers are presented in this article. A full picture of the involved chemical mechanisms is also provided thanks to photolysis, radical characterization, and redox measurements.

The influence of ionic liquid's nature on free radical polymerization of vinyl monomers and ionic conductivity of the obtained polymeric materials

2007 ◽  
Vol 18 (1) ◽  
pp. 50-63 ◽  
Author(s):  
Yakov S. Vygodskii ◽  
Olga A. Mel'nik ◽  
Elena I. Lozinskaya ◽  
Alexander S. Shaplov ◽  
Inna A. Malyshkina ◽  
...  
Keyword(s):  
Free Radical ◽  
Ionic Conductivity ◽  
Radical Polymerization ◽  
Free Radical Polymerization ◽  
Polymeric Materials ◽  
Vinyl Monomers
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