Weng Y, Howard L, Xie D
a Department of Biomedical Engineering , Purdue School of Engineering and Technology , Indiana University-Purdue University at Indianapolis , Indianapolis , IN 46202 , USA.
J Biomater Sci Polym Ed. 2014 Jul;25(10):1076-90. doi: 10.1080/09205063.2014.920169. Epub 2014 May 28.
We have developed a novel glass-ionomer cement (GIC) system composed of photo-curable star-shaped poly(acrylic acid-co-itaconic acid)s. These polyacids were synthesized via a chain-transfer radical polymerization using a newly synthesized multi-arm chain-transfer agent. The star-shaped polyacids showed significantly lower viscosities in water as compared to the linear polyacids. Due to the lower viscosities, the molecular weight (MW) of the polyacids can be significantly increased for enhancing the mechanical strengths while keeping the ease of mixing and handling. The effects of MW, GM-tethering ratio, P/L ratio, and aging on the compressive properties of the experimental cements were significant. The light-cured experimental cements showed significantly improved mechanical strengths i.e. 49% in yield strength, 41% in modulus, 25% in CS, 20% in DTS, and 36% in FS, higher than commercial Fuji II LC. After aging in water for 1 month, the compressive strength of the novel light-cured experimental cement reached 343 MPa, which was 34% and 42% higher than Fuji II and Fuji II LC, respectively. This one-month aged experimental cement was also 23% higher than itself after one day aging, indicating that aging in water can significantly enhance salt-bridge formation for this novel star-shaped polyacid-comprised GIC.
我们开发了一种新型玻璃离子水门汀（GIC）体系，其由光固化星形聚（丙烯酸 - 衣康酸）组成。这些多元酸是通过使用新合成的多臂链转移剂经链转移自由基聚合反应合成的。与线性多元酸相比，星形多元酸在水中的粘度显著更低。由于粘度较低，在保持易于混合和操作的同时，可以显著提高多元酸的分子量（MW）以增强机械强度。MW、GM连接比、P/L比和老化对实验水门汀抗压性能的影响显著。光固化实验水门汀的机械强度显著提高，即屈服强度提高49%、模量提高41%、抗压强度提高25%、抗张强度提高20%、抗弯强度提高36%，高于市售的富士II LC。在水中老化1个月后，新型光固化实验水门汀的抗压强度达到343MPa，分别比富士II和富士II LC高34%和42%。这种经过1个月老化的实验水门汀在老化1天后也比其自身高23%，表明在水中老化可显著增强这种新型含星形多元酸的GIC的盐桥形成。
