TY - JOUR
T1 - Enhanced heat resistance of acrylic pressure-sensitive adhesive by incorporating silicone blocks using silicone-based macro-azo-initiator
AU - Park, Hee Woong
AU - Seo, Hyun Su
AU - Kwon, Kiok
AU - Lee, Jung Hyun
AU - Shin, Seunghan
N1 - Funding Information:
Funding: This study was supported by the Technology Development Program (S2830047) by the Ministry of SMEs and Startups (MSS) and by the Big Issue Program (EO200011) by the Korea Institute of Industrial Technology (KITECH), Republic of Korea.
PY - 2020/10
Y1 - 2020/10
N2 - To improve the heat resistance of acrylic-based pressure-sensitive adhesive (PSA), silicone-block-containing acrylic PSAs (SPSAs) were synthesized using a polydimethylsiloxane (PDMS)-based macro-azo-initiator (MAI). To evaluate the heat resistance of the PSA films, the probe tack and 90◦ peel strength were measured at different temperatures. The acrylic PSA showed that its tack curves changed from balanced debonding at 25◦ C to cohesive debonding at 50◦ C and exhibited a sharp decrease. However, in the case of SPSA containing 20 wt% MAI (MAI20), the balanced debonding was maintained at 75◦ C, and its tack value hardly changed with temperature. As the MAI content increased, the peel strength at 25◦ C decreased due to the microphase separation between PDMS-and acryl-blocks in SPSA, but the shear adhesion failure temperature (SAFT) increased almost linearly from 41.3 to 122.8◦ C. Unlike stainless steel substrate, SPSA showed improved peel strength on a polypropylene substrate due to its low surface energy caused by PDMS block. Owing to the addition of 20 wt% silicone-urethane dimethacrylate oligomer and 200 mJ/cm2 UV irradiation dose, MAI20 showed significantly increased 90◦ peel strength at 25◦ C (548.3 vs. 322.4 gf/25 mm for pristine MAI20). Its heat resistance under shear stress assessed by shear adhesion failure test (SAFT) exhibited raising in failure temperature to 177.3◦ C when compared to non-irradiated sample.
AB - To improve the heat resistance of acrylic-based pressure-sensitive adhesive (PSA), silicone-block-containing acrylic PSAs (SPSAs) were synthesized using a polydimethylsiloxane (PDMS)-based macro-azo-initiator (MAI). To evaluate the heat resistance of the PSA films, the probe tack and 90◦ peel strength were measured at different temperatures. The acrylic PSA showed that its tack curves changed from balanced debonding at 25◦ C to cohesive debonding at 50◦ C and exhibited a sharp decrease. However, in the case of SPSA containing 20 wt% MAI (MAI20), the balanced debonding was maintained at 75◦ C, and its tack value hardly changed with temperature. As the MAI content increased, the peel strength at 25◦ C decreased due to the microphase separation between PDMS-and acryl-blocks in SPSA, but the shear adhesion failure temperature (SAFT) increased almost linearly from 41.3 to 122.8◦ C. Unlike stainless steel substrate, SPSA showed improved peel strength on a polypropylene substrate due to its low surface energy caused by PDMS block. Owing to the addition of 20 wt% silicone-urethane dimethacrylate oligomer and 200 mJ/cm2 UV irradiation dose, MAI20 showed significantly increased 90◦ peel strength at 25◦ C (548.3 vs. 322.4 gf/25 mm for pristine MAI20). Its heat resistance under shear stress assessed by shear adhesion failure test (SAFT) exhibited raising in failure temperature to 177.3◦ C when compared to non-irradiated sample.
KW - Loop tack
KW - Peel strength
KW - Pressure-sensitive adhesive (PSA)
KW - Silicone acrylic block copolymer
KW - Thermal stability
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U2 - 10.3390/polym12102410
DO - 10.3390/polym12102410
M3 - Article
AN - SCOPUS:85093921037
VL - 12
SP - 1
EP - 15
JO - Polymers
JF - Polymers
SN - 2073-4360
IS - 10
M1 - 2410
ER -