What do you mean by photopolymerization?
Photopolymerization is a technique that uses light (visible or ultraviolet; UV) to initiate and propagate a polymerization reaction to form a linear or crosslinked polymer structure. From: Journal of Controlled Release, 2016.
How do photopolymers work?
Photopolymerization works by leveraging the UV-sensitive properties of photopolymer materials. For most 3D printing processes, layers of deposited material are cured via a UV light. After the 3D printer has completed a layer, a UV light is projected over it.
What are the 6 parts of photopolymer?
Photopolymer
- Fabrication.
- 3D Printing.
- Viscosity.
- Photons.
- Resin.
- Ultraviolet Light.
- Electric Potential.
- Photoinitiator.
What are photopolymer resins?
The term photopolymer refers to a class of light-sensitive resins that solidify when exposed to ultraviolet (UV) light. When the liquid photopolymer resin comes into contact with a UV light source — typically a lamp, laser, or projector — photoinitiators transform that light energy into chemical energy.
What are photopolymers made of?
Typically a photopolymer consists of a mixture of multifunctional monomers and oligomers in order to achieve the desired physical properties, and therefore a wide variety of monomers and oligomers have been developed that can polymerize in the presence of light either through internal or external initiation.
What is photopolymerization in SLA?
Photopolymerization 3D printing technology encompasses several different process that rely on the same basic strategy: a liquid photopolymer contained in a vat (or tank) is selectively cured by a heat source. StereoLithogrAphy (SLA) SLA is also known as SL, optical fabrication, photo-solidification, or resin printing.
What are the basic composition of photopolymers used in VAT polymerization based 3D printing technique?
Continuous Liquid Interface Production (CLIP) by Carbon The CLIP vat photopolymerization technique uses a tank of resin as base material. Part of the vat bottom is transparent to ultraviolet light, and therefore called the window.
How are photopolymers made?
Photopolymers undergo a process called curing, where oligomers are cross-linked upon exposure to light, forming what is known as a network polymer. An example of a mixture that undergoes cross-linking when exposed to light is shown below. The mixture consists of monomeric styrene and oligomeric acrylates.
What do you understand by resin?
resin, any natural or synthetic organic compound consisting of a noncrystalline or viscous liquid substance. Natural resins are typically fusible and flammable organic substances that are transparent or translucent and are yellowish to brown in colour.
What is photopolymerization in additive manufacturing?
Share. Vat photopolymerization is a category of additive manufacturing (AM) processes that create 3D objects by selectively curing liquid resin through targeted light-activated polymerization. Stereolithography, the first AM process to be patented and commercialized, is a vat photopolymerization technique.
What is a photopolymer?
A photopolymer product can be applied as a very thin coating as in liquid photoresists or formed into a large model as in a stereolithographic/ 3D printing equipment. Photopolymer formulations comprise of polymers, oligomers, monomers and additives.
What are photoopolymer printing forms made of?
Photopolymer printing forms for pad printing were originally developed from letterpress and flexographic printing forms. They are made of a laminate of steel base on which plastic UV photosensitive polymer material is anchored by an adhesive layer (Figure 16.6 ).
What is a monomer?
– Definition, Classification, Examples with Videos What is a Monomer? Monomer is defined as a simple molecule with two or more binding sites through which it forms covalent linkages with other monomer molecules to form the macromolecule. Monomers are thus building blocks of polymers.
What are examples of monomers and polymers?
What are examples of monomers? Examples of the monomers are glucose, vinyl chloride, amino acids, and ethylene. Every monomer can link up to form a variety of polymers in different ways. For example, in glucose, glycosidic bonds that bind sugar monomers to form polymers such as glycogen, starch, and cellulose.