HC Plastics News: More and more coatings, including varnishes and printing inks, as well as dental fillings, are cured with light. However, it is not possible to produce a uniform polymer network, and the materials tend to be brittle, which limits the application of photopolymers in the fields of three-dimensional printing, biomedicine and microelectronics. In the Angewandte Chemie journal, researchers have proposed a new method, based on methacrylate, to make a uniform cross-linking tough polymer, even at high resolution for 3D printing.
Photocuring is usually a free radical chain polymerization. The initiator is decomposed into free radicals by light energy and attacks the monomer, such as the C=C double bond in the vinyl group, to form a new radical, which becomes a polymer network by attacking more monomers and binding them together. starting point.
New methods of controlling free radical photopolymerization and improving the material properties of the product tend to slow down the curing process, which is not ideal for 3D printing. The short illumination phase is critical for high spatial resolution and economical production time.
A team led by Robert Liska of the Technical University of Vienna (Austria) developed a new method based on methacrylate photopolymers without inhibiting the curing process. They use ester activated vinyl sulfonate (EVS) as a chain transfer agent because it can be easily separated from a portion of itself to activate the process.
If a growing polymer network attacks EVS instead of another monomer, an intermediate is formed and rapidly splits to form a terminated polymer chain and a highly reactive group (tosyl) in the network, which in turn Will trigger a new chain reaction. The more EVS added, the shorter the average chain length of the polymer network. Since the shorter polymer chains maintain a longer mobility, the risk of shrinkage during the curing process is significantly reduced. In contrast to conventional chain transfer agents, the polymerization is not inhibited in this new process, since the presence of a stable intermediate or a reversible reaction step is present, so it is advantageous to isolate the tosyl group.
To test it, the researchers used a methacrylate copolymer to create a stent-like sample structure. The thickness is 50 μm, which is well resolved in the structure in each layer. The material is very uniform, strong but elastic and impact resistant with high tensile strength. These properties can be adjusted by changing the number of EVS added. Without EVS, the material would be too fragile to print in 3D. This new method produces tough photopolymers for biomedical applications such as shape memory polymers for tissue growth and tooth filling. 
Responsible Editor: Honor
Cree LED Grow Light can save about 30% cost in the application,mainly lie in LED package cost,light engine production costs and the secondary light distributioncosts, which is great significance for applications and promotion of semiconductor lighting. We could also DIY the led ratio(wavelength ratio) which imitate the natural sun spectrum to help your plants grow in a very natural type of atmosphere, Absolutely, we are the very original and professional OEM/ODM factory, our Cree LED Grow Light have the great cost performance with the new integration technology being used for mass production, partners around the world keep telling us how amazed at the increase in output and the decrease in the energy bill.
Applications
Our professional full spectrum Cree LED grow light are suitable for all the indoor plants and good for seeding, growth,flowering and fruiting stages of plants, increasing the harvest and Saving energy.
Key Features
Plug with listed certificate safe to use.
Item Display
The Plug you can choose
Full Spectrum Cree LED Grow Light PAR Value
Our Ageing Test
Package
Warnings:
1.lndoor use only.
2.To avoid being damaged,do not use water or drip irrigation while using.
3.Sunshine lighting time should be 12-18 hours.
4.While irradiating the plants,the height of led grow lamp is not less than 10 inches,low height will cause the destruction of plants.
5.Highly hang the lamp will weaken the energy and affect the growth cycle of the plants, so the lamp should not be hung too high.
6.While taking care of the plants, please spray the leaves and branches 2-3 times everyday,to ensure the the plants do not wrinkle a wither, and have no phenomenon of few fruit, and hard pericarp.
Warmly welcome to Visit our Factrory when you come to China.
CREE Chips LED Grow Light,CREE LED Grow Light,CREE Grow Light,CREE COB LED Grow Light
Shenzhen Phlizon Technology Co.,Ltd. , https://www.szledaquariumlight.com