Novel N-alkyl-N-(phosphonoethyl) substituted mono-, bis- and tris(meth)acrylamides 3 were synthesized by two different three-step reactions and characterized by IR, 1H NMR and 13C NMR spectroscopy as well as refractive index and viscosity. The phosphonoethyl substituted (meth)acrylamide monomers show improved hydrolytic stability compared to carboxylic esters. The highest stability was found for the phosphonoethyl substituted acrylamide monomers. Acrylamides have a larger polymerization enthalpy ranging from −50 to −70 kJ·mol−1 per double bond compared to methacrylamides which show −8.57 to −25.1 kJ·mol−1 per double bond. Depending on their structure (meth)acrylamides 3 exhibit an adhesion to enamel and dentin up to 19.5 MPa. The monomer 3c shows the highest adhesion values to both substrates, namely 15.3 ± 3.4 MPa to enamel and 18.5 ± 2.3 MPa to dentin.
通过两种不同的三步反应合成了新型N-烷基-N-(磷酸乙基)取代的单、双和三(meth)丙烯酰胺3,并通过红外光谱、1H核磁共振和13C核磁共振光谱、折射率和粘度进行了表征。与羧酸酯相比,磷酸乙基取代的(meth)丙烯酰胺单体显示出改善的水解稳定性。磷酸乙基取代的丙烯酰胺单体具有最高的稳定性。丙烯酰胺的聚合焓范围较大,从-50到-70 kJ·mol-1每个双键,而甲基丙烯酰胺的聚合焓范围为-8.57到-25.1 kJ·mol-1每个双键。根据它们的结构,(meth)丙烯酰胺3对牙釉质和牙本质具有高达19.5 MPa的粘附力。单体3c对两种基质的粘附值最高,分别为15.3 ± 3.4 MPa对牙釉质和18.5 ± 2.3 MPa对牙本质。