Synthesis, structure and properties of non‑silicone release agents based on poly (vinyl n-octadecyl carbamate)

Abstract

Non‑silicone release agents with good temperature resistance and low release force are highly desired in the electronics industry to meet quality and safety regulations. In this study, a series of poly(vinyl n-octadecyl carbamate) (PVODC) containing different amounts of long alkyl side chains were synthesized based on poly(vinyl alcohol) (PVA) and octadecyl isocyanate (ODI). The effects of alkyl side chains on the chemical structure, crystallization, chain stacking, and thermal stability of PVODCs were explored by spectroscopy, scattering/diffraction, and thermal analysis techniques. The results showed that the alkyl side chains of PVODCs formed hexagonally stacked lamellar structures at room temperature. Introducing more side chains gradually destroyed the regularity of PVODC chains, leading to lower melt viscosity, melting points, and thermal stability. The surface energy and peel strength of PVODC-coated release films decreased and then leveled off as more side chains were introduced. The optimal degree of graft substitution was determined to be 45 %, at which the PVODC achieved a good balance of release performance, melting point, and cost as a non‑silicone release agent.