Preparation and properties of UV‐curable poly(dimethylsiloxane) urethane acrylate. II. Property‐structure/molecular weight relationships

Abstract

SUMMARY:A new type of a UV-curable polyurethane acrylate resin based on hydroxyterminated polydimethylsiloxane (F'DMS) soft segments with molecular weight 1800 and 2,4-toluene diisocyanate (TDI)/Z-hydroxyethyl methacrylate (HEMA) hard segments were synthesized. The reactivity of 2,4-TDI with the hydroxy groups of silanol and HEMA was discussed by means of IR measurements. The characteristic absorption peaks of the -NCO groups of 2,4-TDI in the para-and ortho-position should decline with increasing the reaction time. The measurements of fundamental physical properties of this type of UV-curable materials had been widely studied in addition to the effects of using various reactive diluents and some pigments. This kind of resin with good optical, electrical insulating, and adhesive properties on various matrices, could be improved in chemical properties and reduced in viscosity while promoting the coating processability by mixing with various reactive diluents. The excellent adhesive properties on glass plates can be attributed to the similar structure between the PDMS soft segments and glass which makes the application in the coating industry possible. ZUSAMMENFASSUNG:Es wurde ein neuer Typ eines UV-hiirtbaren Polyurethanacrylatharzes synthetisiert, das auf hydroxyterminierten Polydimethylsiloxan (F'DMS)-Weichsegmenten mit einem Molekulargewicht von 1 800 und 2,4-Toluoldiisocyanat (TDI)/ZHydroxyethylmethacrylat (HEMA) Hartsegmenten basiert. Die Reaktivitiit von 2,4-TDI mit den Hydroxygruppen von Silanol und HEMA wurde anhand von IR-Messungen diskutiert. Die charakteristischen Absorptionspeaks der NCO-Gruppen von 2,4-TDI in para-und ortho-Stellung sollten mit zunehmender Reaktionszeit abnehmen.Die MeBmethodik der wesentlichen physikalischen Eigenschaften dieser Art von UV-hiirtbaren Materialien wurde ebenso wie auch der EinfluB verschiedener reaktiver Verdiinnungsmittel und einiger Pigmente untersucht. Dieses Harz mit guten opti-* Correspondence author.

Thermal and Mechanical Properties of Cross-Linked Photopolymers Based on Multifunctional Thiol−Urethane Ene Monomers

“…Slight differences in the thermal transitions and the mechanical properties may be attributed to the different isocyanate structures. Previous work − with a photocurable urethane acrylate exhibited a similar order; i.e., IPDI-based materials exhibited higher modulus and strength at break than TDI-based ones. In order to elucidate the effect of adding reactive diluent DAE on the tensile properties, the samples with compositions TriThiol−90% TAE1/10% DAE and TriThiol−85% TAE4/15% DAE were evaluated, and results are also given in Figure .…”

Mechanical and thermal properties of UV‐curable polyurethane and polyurea acrylates

“…Oligomers investigated include polycarbonates, ',12 poly( propylene oxide) ,I2 poly (tetramethylene oxide) ,8,',12 polycaprolactone,sv'2 poly (dimethylsiloxane ) , 13,14 ethylene glyc~l/adipicacid,~,~poly (tetramethyleneadipate) ,"and polybutadiene." Oligomer type and molecular weight have been found to have a substantial effect on mechanical properties.…”

Synthesis and properties of ultraviolet‐curable resins via a thio–ene (thiol and allyl) addition reaction

“…There are a great number of articles and patents on photocurable resins, including unsaturated polyester, epoxy acrylate, acrylate or methacrylate, and urethane types 1. An ever growing number of resins that polymerize readily under UV radiation, particularly the very reactive multifunctional acrylates1–4 and methacrylates,5–8 began to be commercialized when the many advantages of this new technology9–12 became apparent. Acrylic oligomer curing with UV radiation is increasing in industrial importance, particularly for coatings of wood, paper, plastics, and tin plates for printing ink.…”