Mechanical properties of 3-glycidoxypropyltrimethoxysilane based hybrid organic-inorganic materials
Mechanical properties of 3-glycidoxypropyltrimethoxysilane based hybrid organic-inorganic materials
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DOI：
10.1023/a:1008782203971
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发表时间：
2001-03-01
影响因子：
2.5
通讯作者：
Maddalena, A
中科院分区：
文献类型：
--
作者：
Innocenzi, P;Esposto, M;Maddalena, A
以正硅酸四乙酯、3-甘氧基丙基三甲氧基硅烷和烷氧钛或烷氧锆为原料，在酸催化下合成了有机-无机杂化材料。在不同的制备条件下测量了这些材料的力学性能。弹性模量E采用共振法和努普微压痕法测定。在125℃下热处理120 h后，用丁氧化钛和丁氧化锆合成的样品的E分别约为3-5和1-2 GPa。在固化时间较长的样品中观察到E的增加。随着加热时间的延长，Knoop显微硬度也有所增加，且以钛烷氧化物合成的样品的Knoop显微硬度高于锆烷氧化物。当应用于处理时间较短的样品时，两种方法给出的结果很一致。在其他样品中，与共振振动方法相比，Knoop微压痕的E值更大。采用Knoop微压痕法测定硬度与弹性模量比H/E。最长热处理时间的弹性回复率与钠石灰玻璃相似。通过三点弯曲试验测量断裂韧性，对处理168 h的样品进行了K-Ic在0.4-0.5 MPa m（1/2）范围内的评估。
Hybrid organic-inorganic materials were synthesized from acid catalysed sols of tetraethyl orthosilicate, 3-glycidoxypropyltrimethoxysilane and titanium or zirconium alkoxides. The mechanical properties of these materials were measured in different conditions of preparation. The elastic modulus E was determined by a resonance method and by Knoop microindentation. After a thermal treatment at 125 degreesC for 120 h, E was around 3-5 and 1-2 GPa for the samples synthesized with titanium butoxide or zirconium butoxide, respectively. An increase in E in the samples cured for longer times was observed. Knoop microhardness also increased with the heating time and was larger in samples synthesized from titanium alkoxides than zirconium alkoxides. The two methods gave results in good agreement when applied to samples treated for shorter times. In the other samples Knoop microindentation gave a larger value of E compared to the resonance vibration method. Hardness to elastic modulus ratio, H/E, was evaluated by Knoop microindentation. The elastic recovery at the longest heat treatment time was similar to that of soda-lime glasses. Fracture toughness was measured by three points flexural test, a K-Ic in the range of 0.4-0.5 MPa m(1/2) was evaluated for samples treated during 168 h.