scholarly journals Free Volume Effect via Various Chemical Structured Monomers on Adhesion Property and Relative Permittivity in Acrylic Pressure Sensitive Adhesives

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2633
Author(s):  
Jung-Hun Lee ◽  
Ji-Soo Kim ◽  
Hyun-Joong Kim ◽  
Kyujong Park ◽  
Jungwoo Moon ◽  
...  
Keyword(s):  
Butyl Acrylate ◽  
Relative Permittivity ◽  
Chemical Structure ◽  
Volume Effect ◽  
The Other ◽  
Smart Devices ◽  
Adhesion Properties ◽  
Pressure Sensitive Adhesives ◽  
Pressure Sensitive ◽  
Gel Fraction

Acrylic pressure-sensitive adhesives (PSAs) are used as fixatives between layers of a display. PSAs’ function is an important factor that determines the performance of the display. Of the various display types available, the touch screen panel (TSP) of smart devices is firmly related to the relative permittivity of the elementals. Therefore, adjusting the relative permittivity of the PSA is indispensable for driving the TSP. Accordingly, selected acrylic pre-polymers were polymerized and the pre-polymer was blended and cross-linked with monomers with different chemical structure to adjust the relative permittivity. The monomers were hexametyldisiloxane (HMDS), N-vinylcaprolactam (NVC), tert-butyl acrylate (TBA), and isooctadecyl acrylate (ISTA). The gel fraction and transmittance as a function of the monomers show a similar result to the pure acrylic PSA. However, the gel fraction value decreased to about 90% and the transmittance decreased to about 85%, due to the immiscibility between nonpolar HMDS and acrylic PSA. On the other hand, the adhesion properties were improved when NVC was added because of the polarity of the nitrogen group. In addition, the relative permittivity of the PSA decreased regardless of the monomer chosen. There was, however, a difference in the optimal content of each monomer, and NVC decreased from 4 phr content to about 3.4 in reducing relative permittivity. Through the above results, it was confirmed that NVC having a nitrogen group is most advantageous in lowering adhesion properties and relative permittivity, and necessitates further research based on the findings.

The Effect of Chemical Structure on the Adhesion Properties of Acrylic Pressure Sensitive Adhesives Prepared by Multifunctional Monomers

Polymer Korea ◽  
2010 ◽  
Vol 34 (3) ◽  
pp. 226-236
Author(s):  
In Mok Cho ◽  
Ho Gyum Kim ◽  
Dong Hee Han ◽  
Jeong Cheol Lim ◽  
Kyung Eun Min
Keyword(s):  
Chemical Structure ◽  
Adhesion Properties ◽  
Pressure Sensitive Adhesives ◽  
Pressure Sensitive

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).

Adhesion properties of polyacrylic block copolymer pressure‐sensitive adhesives and analysis by pulse NMR and AFM force curve

2019 ◽  
Vol 136 (29) ◽  
pp. 47791 ◽  
Author(s):  
Shun Okada ◽  
Yusuke Kashihara ◽  
Tomoyasu Hirai ◽  
Syuji Fujii ◽  
Yoshinobu Nakamura ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Force Curve ◽  
Adhesion Properties ◽  
Pressure Sensitive Adhesives ◽  
Pressure Sensitive
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