Enhanced heat resistance of acrylic pressure-sensitive adhesive by incorporating silicone blocks using silicone-based macro-azo-initiator

Hee Woong Park, Hyun Su Seo, Kiok Kwon, Jung Hyun Lee, Seunghan Shin

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Article number2410
Pages (from-to)1-15
Number of pages15
JournalPolymers
Volume12
Issue number10
DOIs
Publication statusPublished - 2020 Oct

Keywords

  • Loop tack
  • Peel strength
  • Pressure-sensitive adhesive (PSA)
  • Silicone acrylic block copolymer
  • Thermal stability

ASJC Scopus subject areas

  • Chemistry(all)
  • Polymers and Plastics

Fingerprint Dive into the research topics of 'Enhanced heat resistance of acrylic pressure-sensitive adhesive by incorporating silicone blocks using silicone-based macro-azo-initiator'. Together they form a unique fingerprint.

Cite this