scholarly journals Phase Separation Driven On-Demand Debondable Waterborne Pressure-Sensitive Adhesives

Polymers ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 975
Author(s):  
Ehsan Mehravar ◽  
Michael Gross ◽  
Gracia Leal ◽  
Bernd Reck ◽  
Jose Leiza ◽  
...  
Keyword(s):  
Phase Separation ◽  
Melting Temperature ◽  
Particle Morphology ◽  
Adhesive Failure ◽  
Pressure Sensitive Adhesive ◽  
Adhesive Properties ◽  
Pressure Sensitive Adhesives ◽  
On Demand ◽  
Adhesive Interface ◽  
Pressure Sensitive

A waterborne pressure-sensitive adhesive (PSA) that shows high adhesive performance and easy debondability on demand without leaving residues on the substrate (adhesive failure) has been developed. A key component of the PSA is a semicrystalline phase that is beneficial for the adhesive properties and that becomes fluid when heated above the melting temperature. Migration of this liquid-like polymer to the substrate-adhesive interface and hardening upon cooling results in a hard non-tacky interface that facilitates debonding. The effect of the particle morphology on the debonding ability is discussed.

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.

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.

Adhesion mechanisms at soft polymer interfaces

2007 ◽  
Vol 366 (1869) ◽  
pp. 1425-1442 ◽  
Author(s):  
Liliane Léger ◽  
Costantino Creton
Keyword(s):  
Adhesive Layer ◽  
Polymer Chains ◽  
Polymer Interfaces ◽  
Adhesive Failure ◽  
Adhesive Properties ◽  
Extraction Mechanism ◽  
Pressure Sensitive Adhesives ◽  
Pressure Sensitive ◽  
Soft Polymer

Based on several significant examples, we analyse the adhesion mechanisms at soft polymer interfaces with a special emphasis first on the role of connector molecules, that is, polymer chains bound to the interface and which transmit stress through a stretching and extraction mechanism, and second on the necessary relay that must be taken by additional dissipation mechanisms acting at larger scales if one wants to reach typical fracture toughnesses in the range of a few 10 J m −2 . Examples of such bulk dissipation mechanisms will be discussed for interfaces between polymer melts and for pressure-sensitive adhesives in contact with a solid surface. We shall particularly point out the fact that the level of adhesion results from a competition between adhesive failure usually driven by both the interactions and the friction properties of the interface and bulk strong deformations which take place in the bulk of the adhesive layer. Controlling the friction properties of the interface then becomes a tool to finely tune adhesive properties.

Application of Macromonomers for Pressure Sensitive Adhesives II. Phase Separation and Adhesive Properties

1991 ◽  
Vol 36 (2-3) ◽  
pp. 97-107 ◽  
Author(s):  
Katsuhiko Nakamae ◽  
Tatsuo Sato ◽  
G. R. Zhou ◽  
Tsunetaka Matsumoto
Keyword(s):  
Phase Separation ◽  
Adhesive Properties ◽  
Pressure Sensitive Adhesives ◽  
Pressure Sensitive

scholarly journals UV-Crosslinkable Photoreactive Pressure-Sensitive Adhesives Synthesized from Butyl Acrylate and 4-Acryloyloxy Benzophenone

2013 ◽  
Vol 8 ◽  
pp. 21-28 ◽  
Author(s):  
Zbigniew Czech ◽  
Dominika Sowa ◽  
Jagoda Kowalska
Keyword(s):  
Shear Strength ◽  
Molecular Mass ◽  
Butyl Acrylate ◽  
Cohesive Strength ◽  
Pressure Sensitive Adhesive ◽  
Adhesive Properties ◽  
Pressure Sensitive Adhesives ◽  
Uv Crosslinking ◽  
Pressure Sensitive ◽  
Peel Adhesion

The manuscript describes synthesized of photoreactive UV-crosslinkable solvent-borne acrylic pressure-sensitive adhesives (PSA) based on butyl acrylate (BA) and copolymerizable photoinitiator 4-acryloyloxy benzophenone (ABP) characterized by molecular mass in the range of 180 000 to 480 000 Dalton. These copolymers were tacky but possessed insufficient cohesive strength after UV-crosslinking to be useful as PSA. They resulted in materials having a balance of cohesive and adhesive characteristics required of good PSA. Some of the parameters affecting the pressure-sensitive adhesive properties of the copolymer are: amount of the 4-acryloyloxy benzophenone, molecular mass of the polymeric components, UV-reactivity and such important properties like tack, peel adhesion and shear strength.

Passivation of pressure sensitive adhesive stickies by addition of acrylic fibers to OCC pulp before papermaking

TAPPI Journal ◽  
2016 ◽  
Vol 15 (10) ◽  
pp. 631-639
Author(s):  
MOHAMMAD HADI ARYAIE MONFARED ◽  
HOSSEIN RESALATI ◽  
ALI GHASEMIAN ◽  
MARTIN A. HUBBE
Keyword(s):  
Adverse Effects ◽  
Control Sample ◽  
Pressure Sensitive Adhesive ◽  
Acrylic Fiber ◽  
Burst Strength ◽  
Pressure Sensitive Adhesives ◽  
Pressure Sensitive ◽  
Tear Index ◽  
Breaking Length ◽  
Acrylic Fibers

This study investigated the addition of acrylic fiber to old corrugated container (OCC) pulp as a possible means of overcoming adverse effects of water-based pressure sensitive adhesives during manufacture of paper or paperboard. Such adhesives can constitute a main source of stickies, which hurt the efficiency of the papermaking process and make tacky spots in the product. The highest amount of acrylic fiber added to recycled pulps generally resulted in a 77% reduction in accepted pulp microstickies. The addition of acrylic fibers also increased pulp freeness, tear index, burst strength, and breaking length, though there was a reduction in screen yield. Hence, in addition to controlling the adverse effects of stickies, the addition of acrylic fibers resulted in the improvement of the mechanical properties of paper compared with a control sample.

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 Structural and Viscoelastic Properties of Thermoplastic Polyurethanes Containing Mixed Soft Segments with Potential Application as Pressure Sensitive Adhesives

Polymers ◽  
2021 ◽  
Vol 13 (18) ◽  
pp. 3097
Author(s):  
Mónica Fuensanta ◽  
José Miguel Martín-Martínez
Keyword(s):  
Phase Separation ◽  
Potential Application ◽  
Viscoelastic Properties ◽  
Gravimetric Analysis ◽  
Scanning Calorimetry ◽  
Adhesion Properties ◽  
Pressure Sensitive Adhesives ◽  
Thermoplastic Polyurethanes ◽  
Pressure Sensitive ◽  
Soft Segments

Thermoplastic polyurethanes (TPUs) were synthetized with blends of poly(propylene glycol) (PPG) and poly(1,4-butylene adipate) (PAd) polyols, diphenylmethane-4,4′-diisocyanate (MDI) and 1,4-butanediol (BD) chain extender; different NCO/OH ratios were used. The structure and viscoelastic properties of the TPUs were assessed by infrared spectroscopy, differential scanning calorimetry, X-ray diffraction, thermal gravimetric analysis and plate-plate rheology, and their pressure sensitive adhesion properties were assessed by probe tack and 180° peel tests. The incompatibility of the PPG and PAd soft segments and the segregation of the hard and soft segments determined the phase separation and the viscoelastic properties of the TPUs. On the other hand, the increase of the NCO/OH ratio improved the miscibility of the PPG and PAd soft segments and decreased the extent of phase separation. The temperatures of the cool crystallization and melting were lower and their enthalpies were higher in the TPU made with NCO/OH ratio of 1.20. The moduli of the TPUs increased by increasing the NCO/OH ratio, and the tack was higher by decreasing the NCO/OH ratio. In general, a good agreement between the predicted and experimental tack and 180° peel strength values was obtained, and the TPUs synthesized with PPG+PAd soft segments had potential application as pressure sensitive adhesives (PSAs).

Sign in / Sign up

Export Citation Format

Share Document