Evaluation of Tack and Shear Strength of Pressure-Sensitive Adhesives Comprised of Polyurethane and Acrylic Copolymer Blend

Zandi, As&#039;ad; Ghasemirad, Somayeh

Evaluation of Tack and Shear Strength of Pressure-Sensitive Adhesives Comprised of Polyurethane and Acrylic Copolymer Blend

Document Type : Original Research

Authors

A. Zandi

S. Ghasemirad

Polymer Engineering Department, Faculty of Chemical Engineering, Tarbiat Modares University

Abstract

Research subject: In recent years, several studies have been performed for improving the adhesion properties of polyurethane and acrylic pressure-sensitive adhesives (PSAs). Generally, polyurethane PSAs are of higher shear strength, while acrylic PSAs have higher tack. This research is a feasibility study of exploiting the properties of both of these adhesives through a simple blending method, and the adhesion properties were evaluated.

Research approach: First, acrylic copolymer (Ac) consisting of 82 vol. % butyl acrylate and 18 vol. % methyl methacrylate was solution polymerized. On the other hand, a thermoplastic polyurethane (TPU) containing 17.5 wt. % hard segment was prepared by bulk polymerization. Blending of these two polymers was performed by solution mixing. Solutions of the pure polymers and their blends at different contents were cast on polyethylene terephthalate backing and dried at room temperature. Fourier transform infrared spectroscopy, gel permeation chromatography, and differential scanning calorimetry were used to identify TPU and Ac. Loop tack, static shear strength, dynamic mechanical behavior, contact angle of sessile drop, morphology, and haze of the PSAs were evaluated.

Main results: Tack of the acrylic PSA was higher than TPU PSA. Tack of the blend PSAs containing 20, 40, and 60 wt. % TPU was higher than the pure components and that of the blend containing 40 wt. % TPU was maximum. This blend demonstrated the lowest water contact angle compared to the other blends and the shortest relaxation time compared to the pure polymers, which resulted in better wetting and higher tack. The shear strength of the PSAs increased with increase in the content of TPU to higher than 40 wt. % in the blends compared to the acrylic PSA; so that the pure TPU showed the highest modulus at various frequencies and hence exhibited high-shear PSA characteristics in the Chang’s viscoelastic window and the highest adhesion strength. The immiscibility of the blends was confirmed by measuring the haze and calculating the Hansen solubility parameter.

Keywords

Pressure-sensitive adhesive

Tack

Shear Strength

Polyurethane/acrylic blend

Viscoelasticity

Subjects

Processing

1. Mapari S., Mestry S., Mhaske S., Developments in Pressure Sensitive Adhesives: A Review, Polymer Bulletin, 78, 4075–4108, 2020.
2. Ahmadi-Dehnoei A., Ghasemirad S., Shiri R., Preparation and Improvement of Shear Strength of a Water-Redispersible Waterborne Acrylic Adhesive for Making Cellulose Joints, Applied Research in Chemical - Polymer Engineering, 47-57, 2019.
3. Sivasankarapillai G., Eslami E., Laborie M., Potential of Organosolv Lignin Based Materials in Pressure Sensitive Adhesive Applications, ACS Sustainable Chemistry & Engineering, 7, 12817−12824, 2019.
4. Kim J., Hwang J., Baek D., Kim H., Kim Y., Characterization and Flexibility Properties of UV LED Cured Acrylic Pressure-Sensitive Adhesives for Flexible Displays, 10, 1176-1183, 2021.
5. Fuensanta M., Martín-Martínez J., Viscoelastic and Adhesion Properties of New Poly(Ether-Urethane) Pressure-Sensitive Adhesives, Frontiers in Mechanical Engineering, 6, 37, 2020.
6. Taghizadeh S., Mirzadeh H., Barikani M., Yousef M., Miscibility and Tack of Blends of Poly (Vinylpyrrolidone)/Acrylic Pressure-Sensitive Adhesive, International Journal of Adhesion & Adhesives, 29 ,302–308, 2009.
7. Ahmadi-Dehnoei A., Ghasemirad S., Designing of Desired Nanocomposite Pressure-Sensitive Adhesives through Tailoring the Structural Characteristics of Polysilsesquioxane-Acrylic Core-Shell Nanoparticles, International Journal of Adhesion and Adhesives, 111, 102973, 2021.
8. Lei H., He D., Guo Y., Tang Y., Huang H., Synthesis and Characterization of UV-Absorbing Fluorine-Silicone Acrylic Resin Polymer, Applied Surface Science, 442, 71-77, 2018.
9. Stîngă G., Băran A., Iovescu A., Aricov L., Anghel D., Monitoring the Confinement of Methylene Blue in Pyrene Labeled Poly(Acrylic Acid), Molecular Liquids, 273, 125-133, 2018.
10. Baek S., Jang S., Hwang S., Construction and Adhesion Performance of Biomass Tetrahydro-Geraniol-Based Sustainable/Transparent Pressure Sensitive Adhesives, Industrial and Engineering Chemistry, 53, 429-437, 2017.
11. Takahashi K., Yanai F., Inaba K., Kishimoto K., Kozone Y., Sugizaki T., Sticking Effect of a Tackifier on the Fibrillation of Acrylic Pressure Sensitive Adhesives, Langmuir, 37, 11457−11464, 2021.
12. Bartkowiak M., Czech Z., Mozelewska K., Nowak M., Influence of Thermal Reactive Crosslinking Agents on the Tack, Peel Adhesion, and Shear Strength of Acrylic Pressure-Sensitive Adhesives, Polymer Testing, 90, 106603, 2020.
13. Fuensanta M., Martínez J., Thermoplastic Polyurethane Pressure Sensitive Adhesives Made with Mixtures of Polypropylene Glycols of Different Molecular Weights, International Journal of Adhesion and Adhesives, 88, 81-90, 2018.
14. Fuensanta M., Miguel Martín J., Thermoplastic Polyurethane Coatings MadeWith Mixtures of Polyethers of Different MolecularWeights with Pressure Sensitive Adhesion Property, Progress in Organic Coatings, 118, 148–156, 2018.
15. Fuensanta M., Martín-Martínez J., Structural and Viscoelastic Properties of Thermoplastic Polyurethanes Containing Mixed Soft Segments with Potential Application as Pressure Sensitive Adhesives, Polymers, 13, 3097, 2021.
16. Mehravar S., Ballard N., Tomovska R., Asua J., Polyurethane/Acrylic Hybrid Waterborne Dispersions: Synthesis, Properties and Applications, Industrial & Engineering Chemistry Research, 58, 46, 20902-20922, 2019.
17. Marischal L., Cayla A., Lemort G., Campagne C., Devaux E., Selection of Immiscible Polymer Blends Filled with Carbon Nanotubes for Heating Applications, Polymers, 11, 1827, 2019.
18. Panapitiya N., Wijenayake S., Nguyen D., Karunaweera C., Huang Y., Balkus K., Musselman I., Ferraris J., Compatibilized Immiscible Polymer Blends for Gas Separations, Materials, 9, 643, 2016.
19. Robeson Lloyd M., Polymer Blends in Membrane Transport Processes, Industrial & Engineering Chemistry Research, 49, 23, 2010.
20. Fujita M., Takemura A., Ono H., Kajiyama M., Hayashi S., Mizomachi H., Effects of Miscibility and Viscoelasticity on Shear Creep Resistance of Natural-Rubber-Based Pressure-Sensitive Adhesives, Applied Polymer Science, 25, 1535-1545,1999.
21. Fuensanta M., Vallino-Moyano M., Martín-Martínez J., Balanced Viscoelastic Properties of Pressure Sensitive Adhesives Made with Thermoplastic Polyurethanes Blends, Polymers, 11, 1608, 2019.
22. Taghizadeh S., Ghasemi D., Synthesis and Optimization of a Four-component Acrylic-based Copolymer as Pressure Sensitive Adhesive, Iranian Polymer Journal, 19, 343-352, 2010.
23. Mehravar S., Ballard N., Agirre A., Tomovska R., Asua J., Relating Polymer Microstructure to Adhesive Performance in Blends of Hybrid Polyurethane/Acrylic Latexes, Iranian Polymer Journal, 87, 300-307, 2016.
24. Wong C., Haji Badri K., Chemical Analyses of Palm Kernel Oil-Based Polyurethane Prepolymer, Materials Sciences and Applications, 3, 78-86, 2012.
25. Jiao L., Xiao H., Wang Q., Sun J., Thermal Degradation Characteristics of Rigid Polyurethane foam and the Volatile Products Analysis with TG-FTIR-MS, Polymer Degradation and Stability, 98, 2687-2696, 2013.
26. He Z., Li Y., Xiao Z., Jiang H., Zhou Y., Luo D., Synthesis and Preparation of (Acrylic Copolymer) Ternary System Peelable Sealing Decontamination Material, Polymers, 12, 1556, 2020.
27. Akram N., Gurney R., Zuber M., Ishaq M., Keddie J., Influence of Polyol Molecular Weight and Type on the Tack and Peel Properties of Waterborne Polyurethane Pressure-Sensitive Adhesives, Macromolecular Reaction Engineering, 7, 493–503, 2013.
28. Jin S., Lee D., Preparation and Properties of the Nanocomposites Based on Poly(methyl methacrylate-co-butyl acrylate) and Multiwalled Carbon Nanotube, Nanoscience and Nanotechnology, 8, 4675–4678, 2008.
29. Kowalski A., Czech Z., Byczyn´ski Ł., How does the Surface Free Energy Influence the Tack of Acrylic Pressure-Sensitive Adhesives (PSAs)?, Journal of Coatings Technology and Research, 10, 879–885, 2013.
30. Arisawa D., Umetsu Y., Yoshizawa A., Hill C., Eastoe J., Guittard F., Darmanin T., Sagisaka M., Controlling Water Adhesion on Superhydrophobic Surfaces with Bi-Functional Polymers, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 616, 126307, 2021.
31. Chu S.G., Dynamic Mechanical Properties of Pressure-Sensitive Adhesives, Lee L.H. (Ed.) Adhesive Bonding, Springer Science+Business Media, New York, 97–138, 1991.
32. Chang E.P. Viscoelastic Windows of Pressure-Sensitive Adhesives, Adhesion, 34, 189–200, 1991.
33. Liu X., Xiong Y., Shen J., Guo S., Fast Fabrication of a Novel Transparent PMMA Light Scattering Materials with High Haze by Doping with Ordinary Polymer, Optics express, 23, 17793-17804, 2015.
34. Bubmann T., Seidel A., Altstädt V., Transparent PC/PMMA Blends Via Reactive Compatibilization in a Twin-Screw Extruder, Polymers, 11, 2070, 2019.
35. Chen X., Xiang M., Formulating of a Novel Polyolefin Hazy Film and the Origins of Haze Thereof, Polymer Bulletin, 64, 925–937, 2010.
36. Maruhashi Y., Iida S., Transparency of Polymer Blends, Polymer Engineering and Science, 41, 11, 2001.
37. Park H., Seo H., Kwon K., Lee J., Shin S., Enhanced Heat Resistance of Acrylic Pressure-Sensitive Adhesive by Incorporating Silicone Blocks Using Silicone-Based Macro-Azo-Initiator, Polymers, 12, 2410, 2020.
38. Ahmadi-Dehnoei A., Ghasemirad S., Introducing Water-Redispersible Powderable Acrylic Adhesives Using Persian Gum, Industrial Crops & Products, 173, 114083, 2021.
39. Ginzburg V.V., Bicerano J., Christenson C.P., Schrock A.K., Patashinski A.Z., Theoretical Modeling of the Relationship between Young’s Modulus and Formulation Variables for Segmented Polyurethanes, Polymer Science: Part B: Polymer Physics, 45, 2123-2135, 2007.
40. Gallu R., F. Méchin, Dalmas F., Gérard J., Perrin R., Loup F., On the Use of Solubility Parameters to Investigate Phase Separation-Morphology-Mechanical Behavior Relationships of TPU, Polymer, 207, 122882, 2020.
41. Van Krevelen D.W., Te Nijenhuis K., Properties of Polymers: Their Correlation with Chemical Structure, their Numerical Estimation and Prediction from Additive Group Contributions, Fourth Edition, Elsevier, Amsterdam, 189–225, 2009.
42. Wang Y.Z., Bi L.Y., Zhang H.J., Zhu X.T., Liu G.Y., Qiu G.X., Liu S.S., Predictive Power in Oil Resistance of Fluororubber and Fluorosilicone Rubbers based on Three-Dimensional Solubility Parameter Theory, Polymer Testing, 75, 380–386, 2019.