Study on Glass Ionomer Cement using Temperature-response Polymer

为了减少水对玻璃离子水门汀力学性能和粘接耐久性的影响，研究了一种以温度响应型聚合物为水门汀液体的实验水门汀。以不同配比的N-异丙基丙烯酰胺（NIPAM）和丙烯酸（AA）为单体，通过自由基聚合制备了温度响应型聚合物。水泥粉末由含氟铝硅酸盐玻璃组成。AA-NIPAM共聚物的相分离温度随着共聚物中AA的量在0至40摩尔%范围内的增加而降低，并且随着AA的量在40至70摩尔%范围内的增加而增加。由含70mol%AA的AA-NIPAM共聚物制备的骨水泥的粘结强度上级优于由作为普通骨水泥液体的聚（丙烯酸）（PAA）制备的骨水泥的粘结强度。与PAA水泥相比，AA-NIPAM水泥的抗压强度略有下降，但粘结强度随AA用量的增加而增加。

To diminish the effect of water on the mechanical property- and the adhesion-durability of glass ionomer cement, an experimental cement using temperature-response polymer as the cement liquid was studied. Temperature-response polymers were synthesized by radical polymerization of a variety ratio of N-isopropylacrylamid (NIPAM) and acrylic acid (AA). The cement powder consisted of a fluorin containing aluminosilicate glass. The temperature of phase separation of AA-NIPAM copolymer decreased with an increasing amount of AA in the range of 0 to 40 mol% in the copolymer, and increased with an increasing amount of AA in the range of 40 to 70 mol%. The bond strengths of the cement prepared from the AA-NIPAM copolymer containing 70 mol% AA superior to that of the cement prepared from poly (acrylic acid) (PAA) as ordinary cement liquid. The compressive strength of the AA-NIPAM cement dcreased slightly compared with that of PAA cement, but the bond strength increased with an increasing amount of AA.