竹纤维素在连续的冷-解- Pyrolyzing 过程中超分子结构的演变
Zhi Jin1, Shumin Zhang2, Tian Wang2
1Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China.
International journal of biological macromolecules
|February 22, 2025
概括
竹纤维素结构在冷解和热解过程中发生变化. 了解竹纤维和纸的这些变化是开发耐用竹制品和最大限度地利用竹的关键.
科学领域:
- 材料科学 材料科学 材料科学
- 生物材料工程 生物材料工程
- 化学工程是化学工程的重要组成部分.
背景情况:
- 竹子是塑料的可持续替代品,但其在冷解周期下的机械故障限制了其应用.
- 竹子中纤维素的超分子结构显著影响其特性和性能,特别是在热和冷处理后.
研究的目的:
- 在连续的冷-解- Pyrolyzing 过程下,研究竹纤维素 (纤维,羊膜,纸) 的结构演变.
- 了解温度如何影响纤维素分子间距和与水的联合结晶.
- 评估从竹纤维素中制造微晶石墨和有价值的副产品的潜力.
主要方法:
- 连续冷解 (-80°C) 和热解 (高达1600°C) 处理适用于竹纤维,体和肉质.
- 通过对分子间距和结晶度敏感的技术,分析超分子结构演变.
- 热重力测量分析 (TGA) 用于评估气体和生物炭产量.
主要成果:
- 温度从-80°C上升到280°C,由于分子运动的增强,导致葡萄糖链之间的间距扩大.
- 水-纤维素联合结晶发生在低于0°C的水友晶格平面上.
- 在1600°C时,竹纤维产生了理想的微晶石墨结构 (86.39%的d002间距>0.38nm)
- 竹纤维是生产甲 (CH4) 合成气的最佳产品,而竹纤维的生物炭产量最高 (15.9%).
结论:
- 这项研究提供了全面的洞察力,了解竹纤维素在极端温度条件下的超分子结构演变.
- 这些发现支持开发改进的竹制产品,这些产品能够抵抗冷解的降解.
- 建议对竹纤维素进行多目标的利用战略,从生物材料到碳材料和合成气,促进零废弃物应用.
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