Rheological and mechanical properties and interfacial stress development of composite cements modified with thio-urethane oligomers.
Rheological and mechanical properties and interfacial stress development of composite cements modified with thio-urethane oligomers.
复制标题
DOI：
10.1016/j.dental.2016.05.003
复制
发表时间：
2016-08
期刊：
影响因子：
5
通讯作者：
Pfeifer, Carmem S.
中科院分区：
文献类型：
--
作者：
Bacchi, Atais;Pfeifer, Carmem S.
关键词：
硫代氨基甲酸酯低聚物已被证明可以降低高度填充的复合材料中的应力并增加韧性。本研究评估了硫代氨基甲酸酯主链结构对用固定浓度的低聚物改性的树脂水泥的流变学和机械性能的影响。通过将硫醇-季戊四醇四-3-巯基丙酸酯（PETMP）或正-三-3-巯基丙酸酯（TMP）-与异氰酸酯-1，6-己二醇二异氰酸酯（HDDI）（脂肪族）或1，3-双（1-异氰酸基-1-甲基乙基）苯（BDI）（芳香族）或二环己基甲烷4，4 '-二异氰酸酯（HMDI）（环状）以1：2的异氰酸酯：硫醇组合，留下侧基硫醇，合成硫代氨基甲酸酯低聚物（TU）。将20重量% TU加入到BisGMA-UDMA-TEGDMA（5：3：2）中。加入60重量%硅烷化无机填料。近红外用于跟踪甲基丙烯酸酯转化率和聚合速率（Rpmax）。在三点弯曲（ISO 4049）中评价机械性能的弯曲强度/模量（FS/FM和韧性），并在缺口试样（ASTM标准E399-90）中评价断裂韧性（KIC）。在Bioman上测量PS。粘度（V）和凝胶点（定义为储存和损耗剪切模量（G ′/G ″）之间的交叉）用流变仪获得。动态力学分析得到了该网络的玻璃化转变温度（Tg）、交联密度和均匀性。根据ISO 4049评价膜厚度。随着TU的加入，DC和力学性能增加，Rpmax和PS降低。TU组G1/G”期延迟，G1/G”期DC增加。TU组的Tg和交联密度下降，而低聚物则形成更均匀的网络。观察到V的增加，对膜厚度没有影响。PS的显着减少，同时实现了转化率和机械性能的提高。硫代氨基甲酸酯低聚物的添加被证明成功地改善了树脂粘固剂的几个关键性能，而不会破坏牙医用于粘固材料的程序。这种方法有可能很容易地转化为商业材料。
Thio-urethane oligomers have been shown to reduce stress and increase toughness in highly filled composite materials. This study evaluated the influence of thio-urethane backbone structure on rheological and mechanical properties of resin cements modified with a fixed concentration of the oligomers. Thio-urethane oligomers (TU) were synthesized by combining thiols - pentaerythritol tetra-3-mercaptopropionate (PETMP) or trimethylol-tris-3-mercaptopropionate (TMP) - with isocyanates - 1,6-Hexanediol-diissocyante (HDDI) (aliphatic) or 1,3-bis(1-isocyanato-1-methylethyl)benzene (BDI) (aromatic) or dicyclohexylmethane 4,4'-Diisocyanate (HMDI) (cyclic), at 1:2 isocyanate:thiol, leaving pendant thiols. 20 wt% TU were added to BisGMA-UDMA-TEGDMA (5:3:2). 60 wt% silanated inorganic fillers were added. Near-IR was used to follow methacrylate conversion and rate of polymerization (Rpmax). Mechanical properties were evaluated in three-point bending (ISO 4049) for flexural strength/modulus (FS/FM, and toughness), and notched specimens (ASTM Standard E399-90) for fracture toughness (KIC). PS was measured on the Bioman. Viscosity (V) and gel-points (defined as the crossover between storage and loss shear moduli (G'/G")) were obtained with rheometry. Glass transition temperature (Tg), cross-link density and homogeneity of the network were obtained with dynamic mechanical analysis. Film-thickness was evaluated according to ISO 4049. DC and mechanical properties increased and Rpmax and PS decreased with the addition of TUs. Gelation (G'/G") was delayed and DC at G'/G" increased in TU groups. Tg and cross-link density dropped in TU groups, while oligomers let to more homogenous networks. An increase in V was observed, with no effect on film-thickness. Significant reductions in PS were achieved at the same time conversion and mechanical properties increased. The addition of thio-urethane oligomers proved successful in improving several key properties of resin cements, without disrupting the procedures dentists use to polymerize the material. This approach has potential to be translated to commercial materials very readily.
登录
查看更多内容
影响因子：
14
作者：
PATEL, MP;BRADEN, M;DAVY, KWM
通讯作者：
DAVY, KWM
DOI：
10.1016/j.dental.2015.02.008
发表时间：
2015-05
期刊：
Dental materials : official publication of the Academy of Dental Materials
影响因子：
--
作者：
Bacchi A;Consani RL;Martim GC;Pfeifer CS
通讯作者：
Pfeifer CS
影响因子：
4.3
作者：
Riener, CK;Kada, G;Gruber, HJ
通讯作者：
Gruber, HJ
影响因子：
5
作者：
Bacchi, Atais;Nelson, Morgan;Pfeifer, Carmem S.
通讯作者：
Pfeifer, Carmem S.
影响因子：
--
作者：
Manso, Adriana P;Silva, Nelson R F A;Carvalho, Ricardo M
通讯作者：
Carvalho, Ricardo M