密闭高温软化处理竹材的玻璃化转变温度

Glass Transition Temperature of Bamboo after Softening Treatment at High Temperature

动态热机械分析(DMA)可以用来评判水热处理竹材的效果。DMA研究表明:高温软化处理的竹材,其储能模量明显降低,在40℃时,经高温软化处理后竹材的储能模量比未软化处理后的竹材降低了60.4%;未软化处理竹材的玻璃化转变温度(Tg)为119.8℃,软化处理竹材的玻璃化转变温度(Tg)为88.4℃,软化处理竹材的Tg比未软化处理竹材的T下降了26.2%。

Dynamic mechanical analysis （DMA） could be used to evaluate the effect of softening treatment with heat and water.The results of DMA showed that storage modulus （E＇） of softening treatment bamboo at 120 ℃ for 30 min was apparently decreased compared with that of no softening treatment bamboo. The storage modulus （E＇） of bamboo at 40 ℃ after softening treatment at 120 ℃ for 30 rain reduced 60.4% compared with that of no softening treatment bamboo. That is to say that the effect of softening treatment at high temperature was obvious. Glass transition temperature （ Tg） of no softening treatment bamboo was 119.8 ℃, while glass transition temperature （ Tg） of softening treatment bamboo at 120 ℃ for 30 min was 88.4 ℃, Ts of softening treatment bamboo at 120 ℃ for 30 min decreased 26.2% compared with that of no softening treatment bamboo.