Compositional effect on the deformation behavior of polyurethane pressure‐sensitive adhesive thin films

Abstract

The careful selection of composition for thin films is a critical issue to deal with. A mere change in stoichiometry deforms the thin adhesive films brusquely. In this work, a series of thin films of polyurethane‐based pressure‐sensitive adhesives have been synthesized and the factors responsible for collapsing of the adhesive films have been investigated. The pressure‐sensitive adhesives have been prepared by the use of polypropylene glycol and hydroxyl‐terminated polybutadiene macrodiols along with isophorone diisocyanate. The 40 wt % of solid contents have been maintained with hard segment contents of 28–64 wt %. Thin films of 70–100 μm have been utilized for probe‐tack analysis. The high storage modulus up to 1.83 MPa has been observed from dynamic mechanical analysis of PSA films. The adhesion properties evaluated by consideration of the ratio of the loss tangent to the storage modulus (tanδ/E′) for comparison resulted in the values from 0.03 to 0.45 MPa−1. The glass‐transition temperature is also appeared to be a decisive factor with variation from original values. The high‐molecular weight of macrodiols resulted in the loss of adhesiveness. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48395.

Mechanically robust, creep-resistant, intrinsic antibacterial and reprocessable dynamic polyurethane networks based on azine moieties

“…By virtue of their outstanding mechanical properties, selfhealing performance, resilience and biocompatibility, 1,2 polyurethane elastomers find extensive applications in areas such as damping materials, [3][4][5] adhesives, 6,7 self-healing coatings, [8][9][10] flexible electronics [11][12][13] and 3D printing. 14,15 PU elastomers can be classified into two categories: 16 thermoplastic and thermoset PU elastomers.…”

A Rhamnose-PEG-Modified Dendritic Polymer for Long-Term Efficient Transdermal Drug Delivery

“…According to σ skin D and σ skin P measured from porcine skin, the surface of porcine skin was polar, therefore more likely to increase the ability to bind to the skin surface by increasing the polarity of the dendronized polymer. 30,45 The above analyses, along with prior research, indicated that the presence of highly polar groups could augment tissue adhesion. 41 To further explore the interaction between pressuresensitive adhesives (PSAs) and skin tissue, attenuated total reflectance−Fourier transform infrared spectroscopy (ATR-FTIR) was employed.…”

Waterborne Polyurethane Dispersions and Thin Films: Biodegradation and Antimicrobial Behaviors

“…The cost effective and environmental-friendly aqueous PUDs are excellent alternatives to their solventborne counterparts and have the potential to greatly reduce environmental pollution compared to using costly and harmful organic solvents. A huge number of investigations aimed at developing and improving the manufacturing process and quality of waterborne PUDs have been published [ 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ]. The early work of Dieterich and his co-workers in Bayer AG is very crucial because it pioneered the fundamental research in this area [ 16 , 17 ].…”

“…The early work of Dieterich and his co-workers in Bayer AG is very crucial because it pioneered the fundamental research in this area [ 16 , 17 ]. Recently, waterborne PUDs have been selected to replace the solventborne PUDs in various applications, such as coatings for various fibers, paint additives, defoamers, pigment pastes, and textile dyes, associate thickeners, adhesives for alternative substrates, primers for metals, caulking materials, and emulsion polymerization media for different monomers [ 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ]. These environmentally friendly waterborne PUDs are expected to exhibit similar or superior performance compared to that of conventional solvent borne systems.…”