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Merck
CN
  • Free Volume Effect via Various Chemical Structured Monomers on Adhesion Property and Relative Permittivity in Acrylic Pressure Sensitive Adhesives.

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

Polymers (2020-11-14)
Jung-Hun Lee, Ji-Soo Kim, Hyun-Joong Kim, Kyujong Park, Jungwoo Moon, Jinyoung Lee, Youngju Park
摘要

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.

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Sigma-Aldrich
1,6-己二醇二丙烯酸酯, technical grade, 80%
Sigma-Aldrich
丙烯酸叔丁酯, contains 10-20 ppm monomethyl ether hydroquinone as inhibitor, 98%
Sigma-Aldrich
N-乙烯基己内酰胺, 98%, stabilized
Sigma-Aldrich
丙烯酸异丁酯, ≥99%, contains 10-20 ppm monomethyl ether hydroquinone as inhibitor