Miscibility and peel strength of acrylic pressure-sensitive adhesives: Acrylic copolymer–tackifier resin systems

1995 ◽  
Vol 56 (2) ◽  
pp. 201-209 ◽  
Author(s):  
Hyun-Joong Kim ◽  
Hiroshi Mizumachi
Keyword(s):  
Peel Strength ◽  
Acrylic Copolymer ◽  
Pressure Sensitive Adhesives ◽  
Pressure Sensitive

A study of optimization parameters for the development of ultraviolet cured low-acid optically clear adhesive

2019 ◽  
Vol 89 (19-20) ◽  
pp. 3987-3996
Author(s):  
Chung-Feng Jeffrey Kuo ◽  
Hui-Ting Yen ◽  
Wei-Lun Lan ◽  
Garuda Raka Satria Dewangga ◽  
Jiong-Bo Chen ◽  
...  
Keyword(s):  
Refractive Index ◽  
Taguchi Method ◽  
Peel Strength ◽  
Ultraviolet Curing ◽  
Pressure Sensitive Adhesives ◽  
Optimum Parameters ◽  
Pressure Sensitive ◽  
Monomer Content ◽  
Optimization Parameters ◽  
Optimum Response

This study introduced multi-quality optimization using the Taguchi method combined with response surface methodology (RSM) and the particle swarm optimization (PSO) method for synthesizing pressure sensitive adhesives (PSAs) of ultraviolet curing optically clear adhesives (OCAs). The process parameters used in this study included 2-ethylhexyl acrylate (2-EHA) monomer content, the photoinitiator content and the oligomer content using N,N-dimethylacrylamide and acrylic acid. The quality responses included the peel strength, the transmittance, the haze and the refractive index. The Taguchi method was adopted because it could reduce the number of experiments and cost, as well as effectively arriving at a single optimum parameter. The results from the Taguchi method were combined with RSM and PSO to obtain a single composition that has the optimum response for all qualities. The results of the confirmation experiment showed that the optimum parameters were 80 wt% of 2-EHA content, 4.32 wt% of photoinitiator content and 45 wt% of oligomer content, which could obtain the peel strength at 720.3 g/25.4 mm, transmittance up to 97.94%, haze of only 1.93% and refractive index at 1.48. All of qualities meet the industrial requirement of OCA PSAs.

scholarly journals Balanced Viscoelastic Properties of Pressure Sensitive Adhesives Made with Thermoplastic Polyurethanes Blends

Polymers ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1608 ◽  
Author(s):  
Fuensanta ◽  
Vallino-Moyano ◽  
Martín-Martínez
Keyword(s):  
Phase Separation ◽  
Viscoelastic Properties ◽  
Simple Procedure ◽  
Peel Strength ◽  
Similar Degree ◽  
Gravimetric Analysis ◽  
Scanning Calorimetry ◽  
Pressure Sensitive Adhesives ◽  
Thermoplastic Polyurethanes ◽  
Pressure Sensitive

Pressure sensitive adhesives made with blends of thermoplastic polyurethanes (TPUs PSAs) with satisfactory tack, cohesion, and adhesion have been developed. A simple procedure consisting of the physical blending of methyl ethyl ketone (MEK) solutions of two thermoplastic polyurethanes (TPUs) with very different properties—TPU1 and TPU2—was used, and two different blending procedures have been employed. The TPUs were characterized by infra-red spectroscopy in attenuated total reflectance mode (ATR-IR spectroscopy), differential scanning calorimetry, thermal gravimetric analysis, and plate-plate rheology (temperature and frequency sweeps). The TPUs PSAs were characterized by tack measurement, creep test, and the 180° peel test at 25 °C. The procedure for preparing the blends of the TPUs determined differently their viscoelastic properties, and the properties of the TPUs PSAs as well, the blending of separate MEK solutions of the two TPUs imparted higher tack and 180° peel strength than the blending of the two TPUs in MEK. TPU1 + TPU2 blends showed somewhat similar contributions of the free and hydrogen-bonded urethane groups and they had an almost similar degree of phase separation, irrespective of the composition of the blend. Two main thermal decompositions at 308–317 °C due to the urethane hard domains and another at 363–373 °C due to the soft domains could be distinguished in the TPU1 + TPU2 blends, the weight loss of the hard domains increased and the one of the soft domains decreased by increasing the amount of TPU2 in the blends. The storage moduli of the TPU1 + TPU2 blends were similar for temperatures lower than 20 °C and the moduli at the cross over of the moduli were lower than in the parent TPUs. The improved properties of the TPU1 + TPU2 blends derived from the creation of a higher number of hydrogen bonds upon removal of the MEK solvent, which lead to a lower degree of phase separation between the soft and the hard domains than in the parent TPUs. As a consequence, the properties of the TPU1 + TPU2 PSAs were improved because good tack, high 180° peel strength, and sufficient cohesion were obtained, particularly in 70 wt% TPU1 + 30 wt% TPU2 PSA.

Effect of Hybrid Tackifiers on Viscosity, Peel Strength and Shear Resistance of Natural Rubber and Epoxidized Natural Rubber-Based Pressure Sensitive Adhesives

2015 ◽  
Vol 754-755 ◽  
pp. 49-53 ◽  
Author(s):  
Luqman Musa ◽  
Syed Zhafer Firdaus ◽  
Kamarudin Hussin ◽  
Poh Beng Teik
Keyword(s):  
Shear Strength ◽  
Natural Rubber ◽  
Shear Resistance ◽  
Peel Strength ◽  
Epoxidized Natural Rubber ◽  
Pressure Sensitive Adhesives ◽  
Pressure Sensitive ◽  
Maximum Value ◽  
Gum Rosin ◽  
Peel Tests

Natural rubber (SMR L grade), epoxidized natural rubber (ENR) 25 and 50 were loaded with hybrid tackifiers consisting of a mixture of coumarone-indene and gum rosin. The coumarone-indene was fixed at 40 parts per hundred of rubber (phr) while the concentration of gum rosin was varied from 20 to 80 phr. The viscosity, peel and shear strength of the adhesives prepared from the elastomers was studied. Results show that peel strength exhibits a maximum value at 60 phr gum rosin for SMR L-based adhesive while for ENR 25 and ENR 50 based adhesives a maximum value is observed at 40 phr gum rosin which was attributed to the occurrence of optimum wettability and compatibility at this tackifier loading. Meanwhile, viscosity and shear strength decreases with increasing gum rosin concentration. SMR L-based adhesive consistently exhibits higher viscosity and shear strength whereas ENR 25-based adhesive steadily shows higher value for all modes of peel tests.

Effects of miscibility on peel strength of natural-rubber-based pressure-sensitive adhesives

1998 ◽  
Vol 70 (4) ◽  
pp. 777-784 ◽  
Author(s):  
Michiko Fujita ◽  
Mikio Kajiyama ◽  
Akio Takemura ◽  
Hirokuni Ono ◽  
Hiroshi Mizumachi ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Peel Strength ◽  
Pressure Sensitive Adhesives ◽  
Pressure Sensitive

scholarly journals Tacky-Free Polyurethanes Pressure-Sensitive Adhesives by Molecular-Weight and HDI Trimer Design

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2164
Author(s):  
Ji-Hong Bae ◽  
Jong-Chan Won ◽  
Won-Bin Lim ◽  
Byeong-Joo Kim ◽  
Ju-Hong Lee ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Crosslinking Agent ◽  
Crosslinking Density ◽  
Peel Strength ◽  
Poly Ethylene Glycol ◽  
Synthetic Process ◽  
Pressure Sensitive Adhesives ◽  
Pressure Sensitive ◽  
Optimal Balance ◽  
Poly Ethylene

Polyurethane pressure-sensitive adhesives (PU-PSAs) with satisfactory tack, cohesion, and removability were newly developed through the synthetic process by reacting methylene diisocyanate, poly(ethylene glycol) (PEG), and a 1,4-butanediol chain extender based on the different HDI/HDI trimer ratios. The sticking properties of PU-PSAs depended on both the HDI/HDI trimer ratio and crosslinking-agent composition in the formulation. The molecular weight (MW) dependence of adhesion in PU-PSA was observed in the range of 1000 < Mn < 3000, suggesting that the increase in MW limits the pressure-sensitive adhesion of these samples. The differences in the crosslinking-density significantly affected the cohesion, adhesion, and tack in PU-PSA. The formulation of 50 wt.% 600PEG and 50 wt.% crosslinking-agent and an HDI/HDI trimer ratio of 1.0 led to the optimal balance between the adhesion and cohesion properties owing to the sufficient tack, high 180-peel strength, and good cohesion.

Preparation and Properties of CF/CNTs/NanoG Filled Polyacrylate Electrically Conductive Pressure-Sensitive Adhesives

2014 ◽  
Vol 960-961 ◽  
pp. 113-117
Author(s):  
Huan Ma ◽  
Shu Hua Qi ◽  
Fan Zhang ◽  
Zheng He
Keyword(s):  
Shear Strength ◽  
Synergistic Effects ◽  
Peel Strength ◽  
Conductive Adhesives ◽  
Electrically Conductive ◽  
Electrically Conductive Adhesives ◽  
Pressure Sensitive Adhesives ◽  
Comprehensive Properties ◽  
Pressure Sensitive

With the ‘Synergistic Effects’ such as ‘Bridging’ and ‘Intercalating’ between fillers with different morphologies, we can get the CF/CNTs/NanoG filled polyacrylate electrically conductive adhesives (ECA). Through the study, we found that the comprehensive properties of the electrically conductive PSA reach the best when the composite fillers are made up of CF 3wt%、NanoG 5wt% and CNTs 5wt%. The conductivity of the electrically conductive PSA reaches 3.0×10-2 S/cm, the 180o peel strength is 0.38KN/m and the shear strength is 0.42MPa.

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