超支化聚酯的改性及其在牙科修复树脂中的应用

Modification of hyperbranched polyester and its application in dental restorative resin

摘要:

以季戊四醇(B4单体)为核，2,2-二羟甲基丙酸(AB2单体)为单体，对甲苯磺酸为催化剂，通过熔融缩聚反应合成末端为16个羟基的二代Boltorn型超支化聚酯HBP。并进一步用甲基丙烯酰氯、丙酰氯对端羟基进行改性，在HBP末端全部引入双键或部分引入双键，得改性后超支化聚酯GHBP1和GHBP2。在传统牙科修复树脂双酚A甲基丙烯酸缩水甘油酯(Bis-GMA)和二甲基丙烯酸三甘醇酯(TEGDMA)的混合体系中引入不同质量分数的GHBP，考察其对树脂收缩率和双键转化率的影响。结果表明GHBP改性牙科修复树脂后，树脂的聚合收缩明显降低，且GHBP2具有更优异的减小收缩的性能，但双键转化率无明显变化。

Abstract:

The second generation Boltorn-type hyperbranched polyester (HBP) with 16 hydroxyl at the end was synthesized by melting polycondensation reaction. It was based on pentaerythritol (B4) as a core molecule and 2,2-dimethylolpropionic acid (AB2) as monomer and p-toluenesulfonic acid as catalysis. To form the modified hyperbranched polyester GHBP1 and GHBP2, the hydroxyl was further modified by methacryloyl chloride and propionyl chloride introducing all or part of the double bond at the end of HBP. Adding different proportions of GHBP to the conventional dental restorative resin system of bisphenol A glycerolatedimethacrylate (Bis-GMA) and triethylene glycol dimethacrylate (TEGDMA), its influence on the volumetric shrinkage and double bond conversion was investigated. The results indicated that modification with GHBP lead to an obvious decrease in the volumetric shrinkage but a slightly change in the degree of conversion. GHBP2 exhibited better reducing volumetric shrinkage properties.