Impact of macrodiols on the adhesion strength of polyurethane pressure‐sensitive adhesives

Abstract

In this study, we evaluated the influence of stiff and flexible contents on the adhesive characteristics of polyurethane (PU). This was achieved through the optimization of macrodiol contents in the PU composition, which developed soft segments. The composition of the polymer comprises of two different macrodiols: poly(propylene glycol) and hydroxyl‐terminated polybutadiene with various molecular weights. 4,4′‐Methylene bis(cyclohexyl isocyanate) was used to maximize the adhesion strength of the final product, which was evaluated with a texture analyzer. The hard‐segment content (30%) positively affected the adhesive properties. The probe–tack showed a maximum adhesion energy of 147 J/cm2, and the 180° peel test showed a 15.67 N/25 mm peel force. The glass‐transition temperature values obtained through differential scanning calorimetry were in good agreement with the theoretically calculated Flory temperature. The proportion of the loss tangent to the storage modulus showed an optimum value of 2.54 MPa−1. The accurate selection criteria of the macrodiol composition resulted in good PU pressure‐sensitive adhesives. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46635.

New Waterborne Polyurethane-Urea Synthesized with Ether-Carbonate Copolymer and Amino-Alcohol Chain Extenders with Tailored Pressure-Sensitive Adhesion Properties

“…On the other hand, waterborne polyurethane PSAs without crosslinker have been synthesized with PPGs of different molecular weights and hydroxyl-terminated polybutadienes [12], and an increase of the storage modulus was found when the molecular weight of the PPG increased, and an increase in tack resulted when the amount of polybutadiene increased. In recent research, Akram et al [13,14] have studied the influence of the isocyanate and the polyol on the adhesion properties of waterborne polyurethane PSAs made with HTPB and 1,4-butanediol chain extender.In a different approach, Chen et al [15] have synthesized waterborne polyurethane PSAs intended for transdermal drug delivery by using the prepolymer method. Polyethylene glycol (PEG)-modified…”

Influence of Graphene Oxide Contents on Mechanical Behavior of Polyurethane Composites Fabricated with Different Diisocyanates

“…The in situ polymerization process was utilized for the fabrication of polyurethane polymers as described in detail in our previous publications [ 25 , 26 , 27 ], while a reinforcing agent was added to synthesize the composites. The first step of polymerization was carried out by using a four necked round bottom flask fitted with a high speed mechanical stirrer, a thermometer, a reflux condenser, and N 2 gas supply.…”

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

“…The following materials have been used for the synthesis of PSAs. Polypropylene glycol (PPG; number‐average molecular weight, M n = 425, 1000, 2000, and 2700 g‐mol −1 from Sigma‐Aldrich), HTPB ( M n = 2912 g mol −1 from NESCOM, Islamabad, Pakistan), and 1,4‐butane diol, BD (from Acros Organics) were first dehydrated under vacuum for an hour at 80 °C before use . Isophorone diisocyanate (IPDI; Sigma‐Aldrich), triethyl amine (TEA; Sigma‐Aldrich, Taufkirchen, Germany), dimethylol propionic acid, (DMPA; Sigma‐Aldrich), and dibutyltin dilaurate (DBTDL; Sigma‐Aldrich) were used as received.…”

“…A detailed description of synthesis of waterborne PSA's has been reported in our previous work . The precisely calculated quantities of macrodiols (PPG and HTPB) and diisocyanate (IPDI) were reacted in the first step.…”

“…A detailed description of synthesis of waterborne PSA's has been reported in our previous work. [23][24][25][26] The precisely calculated quantities of macrodiols (PPG and HTPB) and diisocyanate (IPDI) were reacted in the first step. This reaction was aided by DMPA and DBTDL (1.0 wt % of the solid contents) to produce the prepolymer chains.…”