Effect of varying polydimethylsiloxane chain length and content on the adhesion and thermal properties of polydimethylsiloxane‐grafted acrylic pressure‐sensitive adhesives

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Abstract
Acrylic pressure‐sensitive adhesive (acrylic PSA) has advantages such as high adhesion, low cost, and high light transmittance, but it has a low adhesion to low‐surface‐energy substrates and low thermal stability. To solve these problems, PSA was modified with low surface energy moieties and crosslinked by UV curing. In this study, a polydimethylsiloxane (PDMS) structure with a low surface energy and good thermal properties was introduced into PSA through grafting polymerization to compensate for the disadvantages of acrylic PSA. PDMS‐grafted acrylic PSAs (PGPs) were synthesized by grafting through method using macromonomers with PDMS of three different lengths. They showed improved loop tack and 180° peel strength values on polypropylene, a low‐surface‐energy substrate. However, when a long PDMS‐based macromonomer (Mw ~ 5000) was used, phase separation was observed even at a low concentration, and the degree of improvement was decreased. The peel strength of PGPs significantly changed with dwelling time. As the surface energy difference between the substrate and PSA increased, the peel strength increased dramatically with dwelling time. 90° peel strengths measured with varying temperature (25–100°C) showed that a long PDMS chain was most effective in improving the thermal stability of the acrylic PSA by its own domains.
Funding Information
  • Korea Institute of Industrial Technology (EI210004)
  • Korea Technology and Information Promotion Agency for SMEs (S2830047)

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