研究波洛克萨默和TEMPO氧化纤维素纳米晶体之间的相互作用
Alessandra Lavoratti1, Onajite Abafe Diejomaoh1, Annela M Seddon2
1Bristol Composites Institute, School of Civil, Aerospace, and Design Engineering, University of Bristol, University Walk, Bristol BS8 1TR, UK.
Carbohydrate polymers
|January 22, 2025
概括
我们成功地将Pluronic F127块共聚合物吸附到纤维素纳米晶体 (CNC) 上. 这种修改增强了热稳定性,并证明了持续的吸附,为可持续材料应用开辟了新的途径.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物化学 聚合物化学
- 纳米技术 纳米技术
背景情况:
- 纤维素纳米晶体 (CNCs) 是可持续的纳米材料,具有多样化的应用.
- 用像Pluronic (PEO-PPO-PEO) 这样的块共聚合物对CNC进行修改,以获得增强的特性.
- 现有文献显示,在CNC上的Pluronic吸附机制上存在分歧.
研究的目的:
- 为了研究Pluronic F127在TEMPO氧化CNC (TOCNC) 上的物理吸附.
- 描述修改后的CNC的吸附机制和性能.
- 为了澄清Pluronic F127和CNC表面之间的相互作用.
主要方法:
- 简单的水性混合Pluronic F127和TEMPO氧化CNCs. 这是一个非常简单的方法.
- 使用核过度检测效应光谱 (NOESY NMR),原子力显微镜 (AFM) 和石晶微平衡与分散监测 (QCM-D) 的表征.
- 评估热稳定性,粘度和通过洗和溶解的吸附持久性.
主要成果:
- 在TOCNCs上实现了Pluronic F127的成功和持续的物理吸附.
- 经过修改的TOCNC表现出热稳定性 (∼19°C) 的显著增加.
- NOESY NMR显示,聚乙烯氧化物 (PPO) 块与TOCNC相比,比聚乙烯氧化物 (PEO) 块更接近,这表明吸附方向出乎意料.
- AFM和QCM-D证实了块共聚合物的刚性,薄层的形成.
- 即使在洗后,也保持了7%的持久性修饰程度,这主要表明不可逆转的吸附.
结论:
- 在TOCNC上Pluronic F127的物理吸附是有效和持久的.
- 这种修改提高了CNC的热稳定性,而不会对悬浮粘度产生负面影响.
- 吸附机制似乎有利于疏水性PPO块与CNC表面的更密切相互作用,这与一些文献的说法相反.
- 这项研究提供了一个强大的方法来修改CNC与块共聚合物用于先进的材料开发.
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