Stereolitografideki fotopolimerizasyon sürecinin matematiksel modellenmesi ve simulasyonu

Altun-Çıftçıoglu, Gökçen Alev; Ersoy-Merıçboyu, Ayşegül
April 2010
ITU Journal Series D: Engineering;Apr2010, Vol. 9 Issue 2, p27
Academic Journal
Stereolithography (SL) is one of the most widely used and cost-effective method for creating threedimensional objects from thin layers of hardened liquid polymers. Generally, an intense ultraviolet (UV) light source is used to solidify these liquid polymers, which are also known as resins, from a series of consecutive two-dimensional (2-D) cross sections. Often data from computer-aided design software is used to control the precise movements of the UV light source as it builds the object. The resulting product may serve as a prototype for engineering designs before its mass production and for low-volume manufacturing applications. Photopolymerization, which is the underlying basic reaction mechanism of SL has a wide range of applications such as: creating decorative and protective coatings, fabricating biomedical prostheses, contact lenses, dental restorations, manufacturing electronic components paints or printing inks, composite materials, and making fiber optic coatings. In SL technique a liquid resin is converted to a solid object of desired geometry by photopolymerization process. Thus, the modeling and simulations of the photopolymerization process that takes place in SL is very important for products manufactured by this technique. The determination of the variation of photopolymerization reaction conversion and the gelation time under different conditions is important for manufacturing products with desired qualities. The absorption of the UV light by the photoinitiator molecules mixed into the resin creates highly reactive radicals, and these radicals interact with the functional groups of monomers that compose the resin. This, in turn, converts the monomers into radicals and starts a chain reaction, which causes a large percentage of the monomers in the resin to ultimately become entangled in a highly cross-linked polymeric network. The key advantages of using light-induced photopolymerization are that such processes tend to be less damaging to the environment; because they generally use smaller amounts of solvents or solvent-free formulations, very high reaction rates at room temperature, spatial control of the process, low energy input; thus being generally economic, and chemical versatility since a wide variety of polymers can be polymerized photochemically. Over the last few decades, a considerable literature has accumulated for the purpose of understanding the kinetics, photoinitiators, polymerization systems, and applications of the photopolymerization process. The most important parameters which govern the photopolymerization process are the temperature, the UV light equipment, the UV light penetration depth, the UV light properties (wavelength and intensity), the functionality and reactivity of the monomer, and initial loading concentration and reactivity of the photoinitiator. The kinetics studies mainly measured and simulated double bond conversion and determined the effect of the parameters just mentioned above on the overall double bond conversion. …


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