基于不同预处理的竹纤维磺化改性及其产物热塑性能研究

Sulfonation of Bamboo Fiber and Thermoplasticity of Its Modified Products Based on Different Pretreatments

以西南地区特色大型竹材巨龙竹为原料,分别经碱、水热、H_(2)O_(2)预处理后,在相对温和条件下进行磺化改性,探究不同预处理对竹纤维磺化改性可及度影响,深入分析磺化改性对竹纤维热塑性的影响调控机制。结果表明:3种预处理均可以提高竹纤维磺化反应可及性,其中基于H_(2)O_(2)预处理的竹纤维再经过磺化改性,即先氧化再磺化,磺化效果最好,磺酸基含量0.49 mmol/g。经磺化改性后竹纤维塑性明显改善,改性竹纤维热塑性随着磺酸基含量的增加而提升。3种改性方式中,经H_(2)O_(2)预处理再进行磺化改性得到的竹纤维塑性最显著,其玻璃化转变温度为104.71℃。

Alkali pretreatment,hydrothermal pretreatment,and H_(2)O_(2) pretreatment was developed to pretreat the Dendrocalamus sinicus,which is the largest bamboo species distributed in Southwest China.The objective of the present research was to evaluate the effect of pretreatments on the accessibility and thermoplasticity of bamboo fiber during sulfonation modification.It was demonstrated that 3 pretreatments could obviously improve the accessibility of sulfonation reaction,and a maximum of 0.49 mmol/g was achieved as the bamboo powder was pretreated with H_(2)O_(2) which had the highest degree of sulfonation modification.In addition,the plasticity of bamboo fiber was improved with the increase of sulfonic group content after sulfonation.The DSC analysis results revealed that the thermoplasticity of bamboo fiber was significantly improved under the synergistic effect of H_(2)O_(2) pretreatment combined with sulfonation modification,and its glass transition temperature(Tg)was 104.71℃.