Synthesis and Characterization of thermally stable Acrylic PSA using Silicone Urethane Methacrylate of Semi-IPN Structure : Semi-IPN 구조의 Silicone Urethane Methacrylate 를 활용한 열적 안정성을 가진 아크릴 PSA 의 합성과 특성

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Pan-Seok Kim

농업생명과학대학 산림과학부(환경재료과학전공)
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Acrylic PSASemi-IPNSiliconeUrethane acrylatePhoto-DSCReal Time-IR
학위논문 (석사)-- 서울대학교 대학원 : 산림과학부(환경재료과학전공), 2012. 8. 김현중.
To improve the thermal stability, polydimethylsiloxane (PDMS) is used and UV curing
method employed. Silicone Urethane Methacrylate (SiUMA) was synthesized and
introduced into acrylic Pressure Sensitve Adhesives (Acrylic PSA) as Semi-
Interpenetrating Polymer Networks (IPN) structure. Through FT-IR the structure was
defined. The kinetics and behavior of SiUMA (S1) were found by adding the
photoinitiator (PI) 0.5, 1.0, 5.0 and 10phr, which were examined using photo-DSC
(photo-DSC). After determining the PI amount 5.0phr, 1000mJ/㎠ UV intensity, added
the SiUMA 20, 40, 60 and 80% to acrylic PSA which was prepared by radical
polymerization and analyzed kinetic and behavior by photo-DSC, Real Time Infrared
Spectroscopy (RTIR). Finally checking the peel strength shows the adhesion property.
As increasing the amount of S1 and increasing the amount of PI, the reaction was
greater. As increasing with the cross-linking, peel strength was dropped sharply which
shows that surface change occurred. When it is applied to acrylic PSA by formed IPN structure, it will be influenced to increase the peel strength before UV curing but peel
strength decrease sharply after UV curing because of S1s mobility to the interface-air.
Next, Silicone urethane methacrylate (SiUMA) is applied to acrylic PSA using IPN
structure with different chain length. Acrylic PSA was prepared by free radical
polymerization and SiUMA was synthesized by additional polymerization by urethane
linkage. Through urethane reaction, SiUMAs were prepared different length. Preparing
of Synthetic Silicone Urethane Methacrylate formed Semi-IPN structure in the acrylic
PSA, it can be verify thermal stability with the SAFT (Shear Adhesion Failure
Temperature) using 1kg weights of plumb. Normally acrylic PSA easily be cleared
from substrate prior to 50℃, but in case of containing S1 10%, it can resistant over
100℃. Photo-DSC shows that the 5phr photoinitiator (PI) and 1000mJ/㎠ of UV
intensity were available to complete curing reaction. Short and long chain 2type chain
polymer structures were confirmed through FT-IR, GPC. And through measuring the
TGA, it can be checked cross-linking effect and improvement of the thermal
resistance using the silicone materials. By ARES, analyzed the thermal property
changes and visco-elastic changes were detected. In this study, mobility of silicone is
detected moving onto the interface-air. The result of the study provide an information
to improve the thermally stability using SiUMA by Semi-IPN structure in acrylic PSA.
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College of Agriculture and Life Sciences (농업생명과학대학)Dept. of Forest Sciences (산림과학부)Theses (Master's Degree_산림과학부)
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