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.

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 Design, synthesis, and investigation of a visible light-driven photo-switching macromolecule

RSC Advances ◽  
2020 ◽  
Vol 10 (58) ◽  
pp. 35164-35173
Author(s):  
Juan Pang ◽  
Xincheng Mao ◽  
Jialin Xu ◽  
Xiang Zhao ◽  
Jingyang Kong ◽  
...  
Keyword(s):  
Visible Light ◽  
Uv Light ◽  
Excitation Source ◽  
Design Synthesis ◽  
Visible Light Driven

The application of azobenzene (AZO) as a kind of photo-switch is restricted by its excitation source, i.e., UV light.

Solvent-free coupling of aryl halides with pyrroles applying visible-light photocatalysis

2017 ◽  
Vol 2 (4) ◽  
pp. 472-478 ◽  
Author(s):  
M. Obst ◽  
R. S. Shaikh ◽  
B. König
Keyword(s):  
Visible Light ◽  
Solvent Free ◽  
Aryl Halides ◽  
Visible Light Photocatalysis ◽  
Visible Light Driven

A novel reactor for solvent-free, visible-light-driven photocatalytic transformations was developed.

scholarly journals Synthesis of photoreactive solvent-free acrylic pressure-sensitive adhesives in the recovered system

2007 ◽  
Vol 9 (2) ◽  
pp. 5-9 ◽  
Author(s):  
Roland Milker ◽  
Zbigniew Czech ◽  
Marta Wesołowska
Keyword(s):  
Organic Solvent ◽  
Solvent Free ◽  
The Novel ◽  
Pressure Sensitive Adhesive ◽  
Adhesive Film ◽  
Pressure Sensitive Adhesives ◽  
Pressure Sensitive ◽  
Wide Range ◽  
Protective Films ◽  
New Type

Synthesis of photoreactive solvent-free acrylic pressure-sensitive adhesives in the recovered system The present paper discloses a novel photoreactive solvent-free acrylic pressure-sensitive adhesive (PSA) systems, especially suitable for the so much adhesive film applications as the double-sided, single-sided or carrier-free technical tapes, self-adhesive labels, protective films, marking and sign films and wide range of medical products. The novel photoreactive solvent-free pressure-sensitive adhesives contain no volatile organic compounds (residue monomers or organic solvent) and comply with the environment and legislation. The synthesis of this new type of acrylic PSA is conducted in common practice by solvent polymerisation. After the organic solvent are removed, there remains a non-volatile, solvent-free highly viscous material, which can be processed on a hot-melt coating machine at the temperatures of about 100 to 140°C.

scholarly journals Visible-Light-Driven Photocatalytic Activity of Magnetic BiOBr/SrFe12O19 Nanosheets

Nanomaterials ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 735 ◽  
Author(s):  
Taiping Xie ◽  
Jiao Hu ◽  
Jun Yang ◽  
Chenglun Liu ◽  
Longjun Xu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Electron Microscope ◽  
Visible Light ◽  
Uv Light ◽  
Light Emitting Diode ◽  
Active Species ◽  
Composite Catalyst ◽  
Light Emitting ◽  
Transmission Electron ◽  
Visible Light Driven

Magnetic BiOBr/SrFe12O19 nanosheets were successfully synthesized using the hydrothermal method. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and UV-visible diffused reflectance spectra (UV-DRS), and the magnetic properties were tested using a vibration sample magnetometer (VSM). The as-produced composite with an irregular flaky-shaped aggregate possesses a good anti-demagnetization ability (Hc = 861.04 G) and a high photocatalytic efficiency. Under visible light (λ > 420 nm) and UV light-emitting diode (LED) irradiation, the photodegradation rates of Rhodamine B (RhB) using BiOBr/SrFe12O19 (5 wt %) (BOB/SFO-5) after 30 min of reaction were 97% and 98%, respectively, which were higher than that using BiOBr (87%). The degradation rate of RhB using the recovered BiOBr/5 wt % SrFe12O19 (marked as BOB/SFO-5) was still more than 85% in the fifth cycle, indicating the high stability of the composite catalyst. Meanwhile, after five cycles, the magnetic properties were still as stable as before. The radical-capture experiments proved that superoxide radicals and holes were main active species in the photocatalytic degradation of RhB.

scholarly journals Synthesis of V2O5 Nanoflakes on PET Fiber as Visible-Light-Driven Photocatalysts for Degradation of RhB Dye

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Yim-Leng Chan ◽  
Swee-Yong Pung ◽  
Srimala Sreekantan
Keyword(s):  
Visible Light ◽  
Uv Light ◽  
High Surface ◽  
Research Work ◽  
High Surface Area ◽  
Order Kinetic ◽  
Polymeric Fibers ◽  
Photodegradation Efficiency ◽  
Continuous Flow Condition ◽  
Visible Light Driven

The visible-light-driven semiconductor photocatalysts are the current research focus techniques used to decompose organic pollutants/compounds. The photodegradation efficiency of organic compounds by photocatalyst is expected to be better compared to UV-light-driven semiconductor photocatalysts technique since the major components of our solar energy are visible light (~44%). However, as most of the previous research work has been carried out using semiconductor photocatalysts in the form of powder, extra steps and costs are needed to remove this powder from the slurry to prevent secondary pollution. In this research work, we will explain our fabrication technique of V2O5 nanoflakes by growing radially on PET fibers. By utilizing the flexibility and high surface area of polymeric fibers as novel substrate for the growth of V2O5 nanoflakes, the Rhodamine B (RhB) could be degraded under visible light irradiation. The photodegradation of RhB solution by V2O5 nanoflakes followed the 1st order kinetic with a constant rate of 0.0065 min−1. The success of this research work indicates that V2O5 nanoflakes grown on PET fibre could be possibly used as organic waste water purifier under continuous flow condition. A photodegradation mechanism of V2O5 nanostructures to degrade RhB dye is proposed based on the energy diagram.

scholarly journals Selected Radical Azoinitiators in the synthesis of Solvent-Borne Acrylic Pressure-Sensitive Adhesives

2009 ◽  
Vol 3 (2) ◽  
pp. 101-106
Author(s):  
Barbara Pabin-Szafko ◽  
◽  
Ewa Wisniewska ◽  
Zbigniew Czech ◽  
◽  
...  
Keyword(s):  
Molecular Weight ◽  
Acrylic Acid ◽  
Organic Solvent ◽  
Ethyl Acetate ◽  
Radical Polymerization ◽  
Methyl Acrylate ◽  
Pressure Sensitive Adhesives ◽  
Pressure Sensitive

Functional azoinitiators: 2,2’-azobis(2-methyl-4-hydroxybutyl propionate) (AIB-BD), 2,2’-azobis[2-methyl-ω-hydroxy-tri(oxyethylene) propionate] [AIB-Tri(OE)] and 2,2’-azobis[2-methyl-ω-hydroxy-oligo(oxyethylene) propionate] [AIB-OOE(400)] were used in radical polymerization of 2-ethylhexyl acrylate, methyl acrylate and acrylic acid in organic solvent ethyl acetate to prepare solvent-borne acrylic pressure-sensitive adhesives (PSA). After polymerization the viscosity, molecular weight and polydispersity of received acrylic PSA have been evaluated and compared with the product of polymerization initiated by the conventional azoinitiator 2,2’-azobisisobutyronitrile (AIBN).

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