Covalently crosslinked networks based on polypropylene glycol) bis(acetoacetate) with either neopentyl glycol diacrylate or hydroxyethyl acrylate derivatized bis(4-isocyanatocyclohexyl)methane (HMDI) were prepared utilizing the Michael addition reaction in the presence of catalytic quantities of diazabicyclo[5.4.0]undec-7-ene (DBTJ). These networks were prepared in the absence of solvent at 23 °C without the formation of byproducts. Mechanical and thermal analyses of the networks were performed utilizing DMA, tensile testing, and TGA. Tensile analysis revealed that the introduction of hydrogen-bonding urethane linkages in the diacrylate segment resulted in higher tensile strengths and elongation to break compared with nonhydrogen-bonding analogs. All crosslinked products exhibited high gel fractions and excellent thermo-mechanical properties.
|ジャーナル||Journal of Polymer Science, Part A: Polymer Chemistry|
|出版ステータス||Published - 2007 9 1|
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