Gelest, Inc- UV/Electron Beam

Silicon, Germanium, Tin and Metal-Organic Compounds

UV/Electron Beam

Methacrylate and acrylate functional silicones undergo the same radical-induced polymerization reactions generally associated with methacrylates and acrylates. The acrylate functional silicones cure at a rate ten times faster than their methacrylate counterparts on exposure to UV/EB in the presence of a photoiniator. The high permeability of siloxanes to oxygen often makes it necessary to blanket the materials with nitrogen due to the fact that oxygen inhibits the methacrylate polymerizations. Metal-organics containing acrylate/methacrylate functionality can also be copolymerized with their organic counterparts. The principal function of all these materials is as modifiers to organic systems.

Epoxycyclohexyl functional siloxanes can also be polymerized by UV/EB exposure in the presence of weak acid donors. Examples of these catalysts offered by Gelest can be seen below.

Gelest also offers a series of silicon dioxide precursors that can be cured on exposure to deep UV (<240nm). These materials can be used for dielectric coatings, overcoats for glass and as diffusion barriers.

Mercapto functional siloxanes can be used to crosslink vinylsiloxanes undergoing radical initiated addition to the unsaturated groups.

Some key products;

Monomers

SIA0200.0	Acryloxypropyltrimethoxysilane
CXMG055	Magnesium methacrylate, anhydrous
CXPO015	Potassium acrylate, anhydrous

Polymers

UMS-992	(Acryloxypropyl)methylsiloxane homopolymer
RMS-033	(2-3% (Methacryloxypropyl)methylsiloxane-dimethylsiloxane copolymer
DMS-R22	Methacryloxypropyl terminated polydimethylsiloxane
DMS-U22	(3-Acryloxy-2-hydroxpropyl) terminated polydimethylsiloxane
EMS-232	(Epoxycyclohexylethylmethylsiloxane)-dimethylsiloxane copolymer
SMS-042	(Mercaptopropyl)methylsiloxane-dimethylsiloxane copolymer
PP1-SESI	Seramic^TM SI High density silicon dioxide precursor
PP1-SESIA	Seramic^TM SIA High density silicon dioxide precursor

UV initiators for Cationic Polymerization

OMAN072	Phenyl-[m-(2-hydroxytetradecyloxy)phenyl]iodonium hexafluoroantimonate
OMBO037	(p-Isopropylphenyl)(p-methylphenyl)-Iodonium tetrakis(pentafluorophenyl) borate
OMTI014	Bis(2,6-difluoro-3-(1-hydropyrrol-1-yl)phenyl)titanocene