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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 160 (1988), S. 41-66 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wurde ein neuer Typ eines UV-härtbaren Polyurethanacrylatharzes synthetisiert, das auf hydroxyterminierten Polydimethylsiloxan (PDMS)-Weichsegmenten mit einem Molekulargewicht von 1800 und 2,4-Toluoldiisocyanat (TDI)/2-Hydroxyethylmethacrylat (HEMA) Hartsegmenten basiert. Die Reaktivität 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 Meßmethodik der wesentlichen physikalischen Eigenschaften dieser Art von UV-härtbaren Materialien wurde ebenso wie auch der Einfluß verschiedener reaktiver Verdünnungsmittel und einiger Pigmente untersucht. Dieses Harz mit guten optischen, elektrischisolierenden und Hafteigenschaften an verschiedenen Matrizes konnte in den chemischen Eigenschaften verbessert und die Viskosität reduziert werden, während die Beschichtungsverarbeitbarkeit durch Mischen mit verschiedenen reaktiven Verdünnern gefördert wurde. Die hervorragenden Hafteigenschaften auf Glasplatten wurden der ähnlichen Struktur zwischen den PDMS Weichsegmenten und Glas zugeschrieben, was eine breite Anwendung in der Beschichtungsindustrie erschließt.
    Notes: A new type of a UV-curable polyurethane acrylate resin based on hydroxyterminated polydimethylsiloxane (PDMS) soft segments with molecular weight 1800 and 2,4-toluene diisocyanate (TDI)/2-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.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 36 (1988), S. 1889-1907 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A series of UV-curable polyurethane acrylate resins based on hydroxy-terminated polydimethylsiloxane (PDMS) soft segments with different molecular weights and various diisocyanate hard segments were synthesized. The products were obtained by employing direct-addition polymerization techniques in a nonsolvent system. The structures of the final products were elucidated by IR and 1H-NMR. The fundamental and physical properties of this type of UV-curable material, the effects on properties by varying the molecular weight of PDMS or the type of diisocyanates, and the effect of using various reactive diluents were widely studied. This resin possessed good optical, electrical insulating, and adhesive properties. The mechanical strength of UV-cured films corresponds approximately to the ratio of hard segments within these material and the dielectric insulating properties correspond to the chain length of PDMS.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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