Improving Latex‐Based Pressure‐Sensitive Adhesive Properties using Carboxylated Cellulose Nanocrystals

2021 ◽  
pp. 2100051
Author(s):  
Vida A. Gabriel ◽  
Mathieu N. Tousignant ◽  
Sean M.W. Wilson ◽  
Marie D.M. Faure ◽  
Emily D. Cranston ◽  
...  
Keyword(s):  
Cellulose Nanocrystals ◽  
Pressure Sensitive Adhesive ◽  
Adhesive Properties ◽  
Pressure Sensitive

Adhesion of Triblock Copolymer-Based Thermoreversible Gels and Pressure Sensitive Adhesives

2000 ◽  
Vol 629 ◽  
Author(s):  
Kenneth R. Shull ◽  
Alfred J. Crosby ◽  
Cynthia M. Flanigan
Keyword(s):  
Elastic Moduli ◽  
Adhesive Layer ◽  
Work Of Adhesion ◽  
Underlying Structure ◽  
Pressure Sensitive Adhesive ◽  
Adhesive Properties ◽  
Pressure Sensitive Adhesives ◽  
Pressure Sensitive ◽  
Surface Development ◽  
Thermoreversible Gels

ABSTRACTTriblock copolymers with poly (methyl methacrylate) (PMMA) end blocks and a poly (n-butyl acrylate) (PnBA) midblock have been synthesized as model pressure sensitive adhesives and thermoreversible gels. These materials dissolve in a variety of alcohols at temperatures above 60 °C to form freely flowing liquids. At lower temperatures the PMMA end-blocks associate so that the solutions form ideally elastic solids. In our case the solvent is 2-ethylhexanol, polymer volume fractions vary from 0.05 to 0.3, and the elastic moduli are close to 10,000 Pa. We have conducted three types of experiments to elucidate the origins of adhesion and bulk mechanical properties of these materials: 1) Weakly adhering gels: The adhesive properties of the gels are dominated by the solvent. Very little adhesion hysteresis is observed in this case, although we do observe hysteresis associated with the frictional response of the layers. 2) Strongly adhering gels. By heating the gels in contact with a PMMA surface, it is possible to bond the gels to the surface. Development of adhesion as the PMMA blocks penetrate into the PMMA substrate can be probed in this case. The cohesive strengths of the gels are found to be substantially greater than their elastic moduli, so that these materials can be reversibly extended to very high strains. These properties have enabled us to probe the origins of elastic shape instabilities that play a very important role in the behavior of thin adhesive layers. 3) Dried gels – model pressure sensitive adhesives. By removing the solvent at low temperatures, the underlying structure of the gel is preserved, giving a thin elastic layer with excellent performance as a pressure sensitive adhesive. Resistance to adhesive failure, expressed as a velocity-dependent fracture energy, greatly exceeds the thermodynamic work of adhesion. This energy is further magnified by ‘bulk’ energy dissipation when the stress applied to the adhesive layer exceeds its yield stress.

Pressure-Sensitive Adhesive Properties of Poly(N-Vinyl Pyrrolidone)/D,L-Lactic Acid Oligomer/Glycerol/Water Blends for TDDS

2010 ◽  
Vol 21 (1) ◽  
pp. 1-15 ◽  
Author(s):  
Jianhua Zhang ◽  
Liandong Deng ◽  
Hujia Zhao ◽  
Mei Liu ◽  
Hongjian Jin ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Vinyl Pyrrolidone ◽  
Pressure Sensitive Adhesive ◽  
Adhesive Properties ◽  
Glycerol Water ◽  
Pressure Sensitive

scholarly journals Butyl acrylate/4-acryloyloxy benzophenone copolymers as photoreactive UV-crosslinkable pressure-sensitive adhesives

2009 ◽  
Vol 11 (3) ◽  
pp. 1-4
Author(s):  
Zbigniew Czech ◽  
Agnieszka Butwin
Keyword(s):  
Molecular Mass ◽  
Butyl Acrylate ◽  
Polymer System ◽  
Pressure Sensitive Adhesive ◽  
Adhesive Properties ◽  
Pressure Sensitive Adhesives ◽  
Uv Crosslinking ◽  
Pressure Sensitive ◽  
Peel Adhesion ◽  
Radical Solution

Butyl acrylate/4-acryloyloxy benzophenone copolymers as photoreactive UV-crosslinkable pressure-sensitive adhesives It has previously been shown that copolymers of butyl acrylate with 4-acryloyloxy benzophenone can be used as pressure-sensitive adhesives (PSAs). This paper presents the synthesis and application of a solvent-borne polymer system for the preparation of photoreactive UV-crosslinkable acrylic pressure-sensitive adhesives. Butyl acrylate/benzophenone copolymers with molecular mass in the range 180 000 to 480 000 Dalton were prepared by carrying out free-radical solution polymerization. These copolymers were found to be tacky but in some cases to possess insufficient cohesive strength after UV-crosslinking to be useful as PSAs. The other copolymers resulted in materials with the balance of cohesive and adhesive characteristics required of good PSAs. Some of the parameters affecting the pressure-sensitive adhesive properties of the copolymers are the concentration of 4-acryloyloxy benzophenone, the molecular mass of the polymeric components, the UV-reactivity, and properties such as tack, peel adhesion, and cohesion.

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