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Dynamic Viscoelastic Properties of Silicon Dioxide/Wood Composite

二氧化硅/木材复合材料的动态黏弹性


为弄清二氧化硅/木材复合材料的动态黏弹性,通过动态热机械分析仪研究不同增重率的二氧化硅/木材复合材料松弛过程的转变温度及力学损耗角正切的变化。结果表明: 二氧化硅/木材复合材料的松弛过程数量减少,直接溶胶-凝胶法制备的二氧化硅/木材复合材料,α松弛过程的转变温度随着增重率的增加而向高温方向移动,增重率为0,5.10%和28.00%的α松弛过程的转变温度分别为75.2,76.8和93.6 ℃;α松弛峰的峰值减小,增重率为0,5.10%,12.63%和28.00%的α松弛过程的损耗角正切值分别为0.043,0.041,0.033和0.03。加硅烷偶联剂法制备的二氧化硅/木材复合材料,随着增重率的增加,α松弛过程的起始温度向低温方向移动,增重率为6.61%,8.08%和10.58%的α松弛过程的起始温度分别为449,41.0和32.2 ℃。

Abstract: In order to know the dynamic viscoelastic properties of silicon dioxide/wood composite, their transition temperature and loss tangent of relaxation process was studied with differern weight percentage gain (WPG) by dynamic mechanical analysis(DMA). The research result showed that: the number of relaxation process of silicon dioxide/wood composite was less than that of untreated wood. The transition temperature of α relaxation process for silicon dioxide/wood composite made by sol\|gel moved towards high temperature with increasing WPG.The transition temperature of α relaxation process of WPG(0,5.10%,28.00%) was 75.2,76.8,93.6 ℃ respectively. The value of α relaxation process peak decreased, and the loss tangent of α relaxation process of WPG(0,5.10%,12.63%,28.00%) was 0.043,0.041,0.033,0.03 respectively. However, the onset temperature of αrelaxation process moved towards low temperature with increasing WPG for silicon dioxide/wood composite made by SCAsolgel. And their α relaxation process onset temperature of WPG(6.61%,8.08%,10.58%) was 44.9,410,32.2 ℃ respetively.


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