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).

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.

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 Influence of Acrylic Acid and Tert-Dodecyl Mercaptan in the Adhesive Performance of Water-Based Acrylic Pressure-Sensitive Adhesives

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2879
Author(s):  
Irene Márquez ◽  
Núria Paredes ◽  
Felipe Alarcia ◽  
José Ignacio Velasco
Keyword(s):  
Acrylic Acid ◽  
Chain Transfer ◽  
Shear Resistance ◽  
Chain Transfer Agent ◽  
Adhesive Properties ◽  
Gel Content ◽  
Pressure Sensitive Adhesives ◽  
Pressure Sensitive ◽  
Water Based ◽  
Dodecyl Mercaptan

Currently, pressure-sensitive adhesives (PSA) are used in more than 80% of all labels in the market today. They do not require any heat, solvent, or water to activate: It only takes light pressure to apply them to a product surface. Many products that come in glass bottles need labels that have staying power in harsh conditions. For that reason, it is necessary to have a good balance between all the polymer adhesive properties. In this study is described how adhesive properties of water-based PSA were affected by varying the amount of functional monomer acrylic acid (AA) and chain transfer agent, tert-dodecyl mercaptan (TDM). Four series of PSA were prepared by emulsion polymerization. Within each polymer series, the AA monomer proportion was held constant between 0.5 and 3.0 phm, and the fraction of the chain transfer agent was varied 0.0 to 0.2 phm. The results showed that the gel content decreased with the increase of the chain transfer agent and with the reduction of AA. All adhesives properties (tack, peel, and shear resistance) improved with increasement of the AA monomer. The increase of chain transfer agent caused decrease of the gel content resulting in higher peel resistance and tack values, but lower shear resistance values.

scholarly journals Tacky-Free Polyurethanes Pressure-Sensitive Adhesives by Molecular-Weight and HDI Trimer Design

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2164
Author(s):  
Ji-Hong Bae ◽  
Jong-Chan Won ◽  
Won-Bin Lim ◽  
Byeong-Joo Kim ◽  
Ju-Hong Lee ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Crosslinking Agent ◽  
Crosslinking Density ◽  
Peel Strength ◽  
Poly Ethylene Glycol ◽  
Synthetic Process ◽  
Pressure Sensitive Adhesives ◽  
Pressure Sensitive ◽  
Optimal Balance ◽  
Poly Ethylene

Polyurethane pressure-sensitive adhesives (PU-PSAs) with satisfactory tack, cohesion, and removability were newly developed through the synthetic process by reacting methylene diisocyanate, poly(ethylene glycol) (PEG), and a 1,4-butanediol chain extender based on the different HDI/HDI trimer ratios. The sticking properties of PU-PSAs depended on both the HDI/HDI trimer ratio and crosslinking-agent composition in the formulation. The molecular weight (MW) dependence of adhesion in PU-PSA was observed in the range of 1000 < Mn < 3000, suggesting that the increase in MW limits the pressure-sensitive adhesion of these samples. The differences in the crosslinking-density significantly affected the cohesion, adhesion, and tack in PU-PSA. The formulation of 50 wt.% 600PEG and 50 wt.% crosslinking-agent and an HDI/HDI trimer ratio of 1.0 led to the optimal balance between the adhesion and cohesion properties owing to the sufficient tack, high 180-peel strength, and good cohesion.

scholarly journals Photoresponsive, switchable, pressure-sensitive adhesives: influence of UV intensity and hydrocarbon chain length of low molecular weight azobenzene compounds

RSC Advances ◽  
2021 ◽  
Vol 11 (59) ◽  
pp. 37392-37402
Author(s):  
Tae-Hyung Lee ◽  
Gi-Yeon Han ◽  
Mo-Beom Yi ◽  
Jae-Ho Shin ◽  
Hyun-Joong Kim
Keyword(s):  
Molecular Weight ◽  
Adhesion Force ◽  
Hydrocarbon Chain ◽  
Low Molecular Weight ◽  
Pressure Sensitive Adhesive ◽  
Pressure Sensitive Adhesives ◽  
Pressure Sensitive ◽  
Hydrocarbon Chain Length ◽  
Low Molecular Weight Compounds ◽  
Uv Visible

A photoresponsive switchable pressure-sensitive adhesive (PSA) was fabricated with an azobenzene-containing polymer and low molecular weight compounds. Its adhesion force was activated/deactivated rapidly by UV/visible light irradiation.

scholarly journals Fractionation of lignin produced from the Earleaf Acacia tree by sequential industrial organic solvents

2021 ◽  
Vol 24 (1) ◽  
pp. 1835-1841
Author(s):  
Thong Hoang Le ◽  
Khanh B. Vu ◽  
Quynh-Thy Song Nguyen ◽  
Phat Van Huynh ◽  
Khanh-Ly T. Huynh ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Organic Solvent ◽  
Ethyl Acetate ◽  
Organic Solvents ◽  
Weight Fraction ◽  
Ft Ir ◽  
Catalytic Applications ◽  
Light Medium ◽  
Acacia Tree ◽  
Different Molecular Weight

Introduction: Understanding the fractions of lignin is important for further conversion of lignin into valuable products. Herein, the “home-made” lignin from Earleaf Acacia tree was extracted by sequential industrial organic solvent and characterized each fraction to reveal its properties for further catalytic applications. Methods: In this work, lignin was prepared from the Earleaf Acacia tree using the soda method. Then, the prepared lignin was fractionated by sequential solvents of ethyl acetate, ethanol, methanol, and acetone. Each lignin fractions were characterized by FT-IR and GPC. Results: The FT-IR results confirmed the soda method can produce lignin from woodchips. The fractionation of lignin separated the lignin mixture into different molecular weight fraction from light – medium into heavy compounds. Conclusion: Lignin was produced from woodchips using the soda method successfully. The fractionation using the sequential organic solvents showed the separation of different molecular weight of lignin, which allow to apply for the further conversion into useful products.

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