title: Effects of silicone acrylate on morphology, kinetics, and surface composition of photopolymerized acrylate mixtures.
abstract: Films (ca. 150 microm thick) of twelve acrylate mixtures, which contained various proportions of hydrocarbon acrylates [mainly oligo(ethylene glycol) diacrylate, (OEGDA)] and small amounts of a silicone hexaacrylate (in proportion of 5% or less), were cured on a nickel substrate, and X-ray photoelectron spectroscopy analysis of the nickel-side surface compositions showed that for formulations with and without the silicone hexaacrylate, this surface was enriched with OEGDA and saturated (up to 50%) with the silicone hexaacrylate, respectively. The silicone hexaacrylate phase-separated and formed micelles which migrated to the resin-nickel interface. Silicone hexaacrylate, inherently less reactive, also significantly slowed the photopolymerization of the mixtures. The sequential homopolymerization of OEGDA and silicone hexaacrylate in a formulation was elicited using real-time Fourier transform infrared spectroscopy. The design-of-experiment approach was used to quantify the influence of the components on gelation time and the nickel-side surface composition as well as provide the statistical models to predict these two properties for new compositions.
authors.affiliation: The Biological and Chemical Process Engineering Laboratory, The Singapore--MIT Alliance Program, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
authors.forename: Wee Koon
authors.initials: WK
authors.lastname: Neo
authors.forename: Mary B
authors.initials: MB
authors.lastname: Chan-Park
authors.forename: Jian X
authors.initials: JX
authors.lastname: Gao
authors.forename: Lu
authors.initials: L
authors.lastname: Dong
mesh_terms: D000179:Acrylates / Q000737:chemistry* / Q000528:radiation effects; D007700:Kinetics; D008567:Membranes, Artificial; D008823:Micelles; D008855:Microscopy, Electron, Scanning; D015394:Molecular Structure; D009532:Nickel / Q000737:chemistry; D010316:Particle Size; D010777:Photochemistry; D012117:Resins, Synthetic / Q000737:chemistry; D012680:Sensitivity and Specificity; D012828:Silicones / Q000737:chemistry* / Q000528:radiation effects; D013052:Spectrometry, X-Ray Emission; D013499:Surface Properties; D014466:Ultraviolet Rays
chemical_list: D000179:Acrylates; D008567:Membranes, Artificial; D008823:Micelles; D012117:Resins, Synthetic; D012828:Silicones; D009532:Nickel