Biological degradation of plastics: a comprehensive review.

Being the earliest form of additive manufacturing, stereolithography (SLA) fabricates 3D objects by selectively solidifying the liquid resin through a photopolymerization reaction. The ability to fabricate objects with high accuracy as well as a wide variety of materials brings much attention to stereolithography. Since its invention in the 1980s, SLA underwent four generations of major technological innovation over the past 40 years. These innovations have thus resulted in a diversified range of stereolithography systems with dramatically improved resolution, throughput, and materials selection for creating complex 3D objects and devices. In this paper, we review the four generations of stereolithography processes, which are scanning, projection, continuous and volumetric stereolithography. For each generation, representative stereolithography system configurations are also discussed in detail. In addition, other derivative technologies, such as scanning–projection, multi-material, and magnetically assisted stereolithography processes, are also included in this review.

/pdf/a-review-of-stereolithography-processes-and-systems-210fsidrhs.pdf

A Review of Stereolithography: Processes and Systems

Challenges associated with plastic waste disposal and allied microbial routes for its effective degradation: A comprehensive review

Photostabilization of coatings. Mechanisms and performance

Advanced methods for manufacturing high quality parts should be used to ensure the production of competitive products for the world market. Investment casting (IC) is a process where a wax pattern is used as a sacrificial pattern to manufacture high precision casting of solid metal parts. Rapid casting is in turn, a technique that eases the IC process by combining additive manufacturing (AM) technologies with IC. The use of AM technologies to create patterns for new industrial products is a unique opportunity to develop cost-effective methods for producing investment casting parts in a timely manner. Particularly, stereolithography (SLA) based AM is of interest due to its high dimensional accuracy and the smooth surface quality of the printed parts. From the first appearance of commercially available SLA printers in the market, it took a few decades until desktop SLA printers became available to consumers at a reasonable price. Therefore, the aim of this review paper is to analyze the state-of-the-art and applicability of SLA based 3D printing technology in IC manufacturing, as SLA based AM technologies have been gaining enormous popularity in recent times. Other AM techniques in IC are also reviewed for comparison. Moreover, the SLA process parameters, material properties, and current issues are discussed.

Application of Stereolithography Based 3D Printing Technology in Investment Casting

Photochemistry is concerned with chemical changes that may be brought about by the absorption of light [1]. In principle, the photochemical reac-tion of a substance proceeds according to two laws. The first one was proposed by Grotthus and Draper in 1818 and states that “a chemical reac-tion of a certain substance only takes place via the excitation of the mole-cule by the absorption of light quantum of sufficient energy.” The second law is the photochemical equivalent law proposed by Einstein in 1912 which states that “each photon or quantum absorbed activates only one molecule” [2].

Photochemical and Thermal Crosslinking of Polymers

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Photochemical and Thermal Crosslinking of Polymers