本文以慈竹(Neosonocalamus affinis (Rendle) Keng f.)为试验对象,研究了慈竹的乙酰化工艺条件;不同乙酰化增重率的慈竹竹篾的尺寸稳定性;以及乙酰化慈竹重组材的主要物理力学性能。
采用响应面分析软件设计了17种乙酰化工艺条件,分别分析反应时间、反应温度和乙酸浓度对乙酰化增重率的影响,发现三因素均对乙酰化增重率的影响是显著的,影响的顺序由大至小依次排列为:温度、时间、浓度。
乙酰化慈竹竹篾的吸水厚度膨胀率和吸水率显著小于未乙酰化处理材,且都是随着乙酰化增重率的增加而不断下降。
经SEM分析,乙酰化慈竹的细胞结构受到一定程度的破坏,细胞壁S1层被腐蚀破坏,细胞内的淀粉粒大量糊化。经FT-IR分析,乙酰化慈竹的亲水羟基官能团大量减少,疏水的酯类官能团大量增加,且随着乙酰化增重率的增加,羟基官能团数量不断减少,脂类官能团数量不断增加,这极大的降低了慈竹的表面极性。经X射线衍射分析,乙酰化慈竹的纤维素结晶度下降了,但是下降的不明显,说明在乙酰化过程中慈竹纤维素的酯化程度比较低。
乙酰化慈竹重组材的吸水厚度膨胀率明显小于未乙酰化处理材,且随着乙酰化增重率的...
【英文摘要】
Neosonocalamus affinis, one of sympodial specieses, was first acetylated in different temperature and pressure, and then the dimension stability, the main physical and mechanical properties of acetylated bamboo specimens with different WPG (Weight Percent Gain), and the dimension stability of strand woven bamboo lumber made of acetylated bamboo slivers, were studied and discussed. The results are as follows:
1. It was demonstrated that the effect of the time and temperature of reaction and the concentra...