A photopolymer is a polymer that changes its properties when exposed to light, often in the ultraviolet or visible region of the electromagnetic spectrum. These changes are often manifested structurally, for example hardening of the material occurs as a result of cross-linking when exposed to light. An example is shown below depicting a mixture of...
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http://en.wikipedia.org/wiki/Photopolymer
Photopolymers are used in light reaction systems either with ultraviolet or visible energy. The liquid material is cross-linked or hardened when exposed to light. Photopolymers are used in both Digital Light Processing(DLP) and Stereolithography(SLA) systems.
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http://reprap.org/wiki/Glossary
Plate material that is photosensitive and upon exposure, its compounds polymerise to form a tough, abrasion resistant surface which becomes the inking media.
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http://www.encyclo.co.uk/local/20829
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