Diffusion in Polymer Matrix and Anisotropic Photopolymerization

  • Vadim V. Krongauz


Photopolymers are used in printing and electronic industries, and their use is expanding to encompass holography, data storage and processing, optical wave-guides, and compact disks. A variety of new compositions is being sought to cater to new applications and novel methods of photoexposure. The photopolymers we will be discussing here consist of a plasticized polymer matrix and low molecular weight reagents dissolved in the plasticizer. In most applications (excluding three-dimensional imaging) this reactive mixture is coated from a solution onto an inert support such as a glass plate or a polymer sheet. After solvent evaporation the photopolymer film can be covered with an inert transparent cover for mechanical integrity. The manufacturing process usually does not exclude air, and oxygen dissolved in a plasticizer prior to or during the coating operation plays an active role in the imaging photopolymerization. In typical applications the illumination applied from one side, perpendicular to the surface, initiates a chemical process that records the incident light pattern as a variation of polymerized and unpolymerized regions (Fig. 5-1). We will examine some peculiarities of polymerization in the photopolymer that affect the image quality and resolution. We will also consider how the photopolymers should be formulated and exposed in order to achieve optimal photospeed and image quality.


Polymer Matrix Vinyl Acetate Polymer Yield Cellulose Acetate Butyrate Oxygen Effect 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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