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Sunday, 15 September 2019
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Raw materials & technologies, Raw materials

Improving the performance of photoinitiators

Monday, 22 September 2014

Researchers have used a well-known photoinitiator to develop a novel technology.

When combined with additive<emphasize>s</emphasize>, the R–Cl based photoinitiating systems can exhibit a higher efficiency than R–Cl alone. Source: Pixelschieber/Pixelio
When combined with additives, the R–Cl based photoinitiating systems can exhibit a higher efficiency than R–Cl alone. Source...

2-(4-Methoxystyryl)-4,6-bis(trichloromethyl)-1,3,5-triazine (R–Cl) appears as a versatile high-performance photoinitiator (PI) under LED exposure at 385, 395 or 405nm (intensities in the range 9-140 mW cm−2). It has been used as an efficient Type I cleavable PI for the free radical photopolymerisation (FRP) of (meth)acrylates under near UV or visible LED irradiation.

Exhibiting a higher efficiency

When combined with various additives (i.e. amine, iodonium salt, or N-vinylcarbazole), the R–Cl based photoinitiating systems can exhibit an even higher efficiency than R–Cl alone. Remarkably, R–Cl alone as well as the R–Cl/additive systems lead to a photoinitiation ability for the FRP of methacrylate under air at 405 nm that is better than that of well-known commercial photoinitiators (e.g. bisacylphosphine oxide (BAPO), 2,4,6-trimethylbenzoyl-diphenyl-phosphineoxide (TPO), or 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-butanone-1 (BDMB)). In addition, the R–Cl/iodonium salt/N-vinylcarbazole combination can also initiate the cationic polymerisation of epoxides in the 385-405 nm range. Moreover, the photochemistry of these systems has been investigated by steady state photolysis, molecular orbital (MO) calculations, and electron spin resonance spin trapping techniques.

The study is published in: Polymer Chemistry, Issue 20, 2014.

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