Segerström Susanna, Meriç Gökçe, Knarvang Torbjørn, Ruyter I Eystein
NIOM, Scandinavian Institute of Dental Materials, Haslum, Norway.
Eur J Oral Sci. 2005 Oct;113(5):422-8. doi: 10.1111/j.1600-0722.2005.00242.x.
Two matrix resins for fiber composites that remain in a fluid state during storage and handling before polymerization were evaluated. The resin mixtures, based on methyl methacrylate (MMA), were produced with two different cross-linking agent systems: 1,4-butanediol dimethacrylate and ethylene glycol dimethacrylate or diethylene glycol dimethacrylate. Water sorption, water solubility, water uptake and residual MMA monomer were determined. Thermomechanical analysis was used to determine linear dimensional changes as a function of temperature. Flexural strength and modulus as well as fracture work and the maximum stress intensity factor were determined. The results revealed similar values for both matrix polymers regarding water sorption, water solubility, water uptake, residual MMA monomer (0.5 wt% (+/- 0.03)) and coefficient of linear thermal expansion. Flexural strength for polymer B was 68.7 MPa (+/- 9.8) compared to 56.0 MPa (+/- 13.3) for polymer A when tested dry and 64 MPa (+/- 6.1) compared to (54 MPa (+/- 3.3) when water-saturated. Fracture toughness tests showed higher maximum stress intensity factor values for polymer B (0.75 +/- 0.17) MPa x m1/2 than for polymer A (0.55 +/- 0.12) MPa x m1/2. The resin binders showed an appropriate consistency while remaining in a fluid state during storage and manipulation.
对两种用于纤维复合材料的基体树脂进行了评估，这两种树脂在聚合前的储存和处理过程中保持流体状态。基于甲基丙烯酸甲酯（MMA）的树脂混合物是用两种不同的交联剂体系制备的：1,4 - 丁二醇二甲基丙烯酸酯和乙二醇二甲基丙烯酸酯或二乙二醇二甲基丙烯酸酯。测定了吸水率、水溶性、吸水量和残余MMA单体含量。采用热机械分析来确定线性尺寸变化与温度的函数关系。测定了弯曲强度和模量以及断裂功和最大应力强度因子。结果表明，两种基体聚合物在吸水率、水溶性、吸水量、残余MMA单体含量（0.5 wt%（±0.03））和线性热膨胀系数方面的值相似。聚合物B在干燥测试时的弯曲强度为68.7 MPa（±9.8），而聚合物A为56.0 MPa（±13.3）；在水饱和测试时，聚合物B为64 MPa（±6.1），聚合物A为54 MPa（±3.3）。断裂韧性测试表明，聚合物B的最大应力强度因子值（0.75±0.17）MPa·m1/2高于聚合物A（0.55±0.12）MPa·m1/2。树脂粘合剂在储存和操作过程中保持流体状态的同时显示出合适的稠度。
