Effects of silicone acrylate on morphology, kinetics, and surface composition of photopolymerized acrylate mixtures.
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.
Neo
Wee Koon
WK
The Biological and Chemical Process Engineering Laboratory, The Singapore--MIT Alliance Program, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
Chan-Park
Mary B
MB
Gao
Jian X
JX
Dong
Lu
L
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
D000179:Acrylates; D008567:Membranes, Artificial; D008823:Micelles; D012117:Resins, Synthetic; D012828:Silicones; D009532:Nickel