Preparation and property study of photocurable polysiloxane polyacrylate materials containing S—S bonds.

In this article, three polymerizable polysiloxane monomers with different chain lengths (MA-Sin, n = 3,6,9) have been synthesized, and then MA-Sin was mixed with disulfide monomer (SA) and different acrylate monomers in certain proportion to obtain a series of photopolymerizable systems. The effects of the contents of SA and MA-Sin, and the chain length of MA-Sin on the photopolymerization kinetics, volume shrinkage, water contact angle, thermal resistance, glass transition temperature (Tg), tensile properties and degradability of the photocured films were explored in detail. The results show that the content and the chain length of MA-Sin have no significant effect on the final double bond conversion, which reaches about 94%. With the increase of SA content, the volume shrinkage of the photocured film descends and eventually drops to 3.23%. The addition of MA-Sin contributes to improve thermal stability and hydrophobicity. With the lengthening of the chain length of MA-Sin, the water contact angle, tensile strength, elongation at break and thermal resistance of the photocured film were enhanced, whereas Tg is decreased. More importantly, the SA endows the photocured films with good degradability. The acrylate photopolymerization systems containing disulfide monomer (SA) and polysiloxane monomer (MA-Sin, n = 3,6,9) exhibit excellent photopolymerization property, low volume shrinkage (3.42%), outstanding degradation property, and improved thermostability and hydrophobicity. [ABSTRACT FROM AUTHOR]