Assessment of a one step method for the chemical functionalization of Cellulose Nanocrystals

纤维素纳米晶体化学功能化的一步法评估

• 批准号: 479140-2015
• 负责人: MoranMirabal, Jose
• 金额: $ 1.82万
• 依托单位: McMaster University
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=579957
• 关键词: Assessment; step; method; chemical; functionalization

Cellulose is the most abundant structural polymer in nature and has been used for millennia as a source of fuel, building materials, and textile fibers. Its widespread use is primarily due to its intrinsic physical, chemical and mechanical properties that arise from the hierarchical organization of cellulose within plant cell walls. Nowadays, the arsenal of cellulosic nanomaterials at our disposal spans particles with lengths of 10's of nanometers to millimeters and aspect ratios from 1 to 1000. Nanocellulosic materials not only exhibit enhanced optical and mechanical properties, but also show unique piezoelectric, and electromagnetic properties that either do not exist or cannot be exploited in their macroscale counterparts. These attributes and their versatility have made nanotechnologists dub cellulose nanocrystals (CNCs) as "nature's carbon nanotubes". The use of CNCs in practical applications relies on our ability to tailor their surface chemistry and understand how these modifications impact their unique properties and colloidal behavior. Despite advances in cellulose nanotechnology, a number of important challenges remain. Perhaps the most pressing challenge for the successful development and commercialization of CNC-based materials is the optimization of nanoparticle dispersion in a variety of solvents and composite materials. Thus, functionalization procedures that are simple, economic, can be carried out in aqueous solutions, and can efficiently modify the surface chemistry of CNCs along with the detailed characterization of the functionalized CNCs, are in high demand for the incorporation of CNCs into industrially-relevant materials. The Moran-Mirabal Research Group has developed a simple and inexpensive method to functionalize cellulosic materials using triazinyl derivatives. The present proposal aims to assess the efficiency of this surface chemistry in functionalizing CNCs produced by CelluForce and allowing them to be dispersed in solvents with a range of polarities. The successful completion of the proposed research will provide CelluForce with methods to readily disperse CNCs into a variety of solvents, allowing them to be incorporated at high concentrations in high value products.

纤维素本质上是最丰富的结构聚合物，已在数千年中用作燃料，建筑材料和纺织纤维的来源。它的广泛使用主要是由于其固有的物理，化学和机械性能是由植物细胞壁内纤维素的分层组织产生的。如今，我们处置处的纤维素纳米材料的库跨度为10到毫米的纳米长度为10到1000。纳米纤维素材料不仅表现出增强的光学和机械性能，而且还显示出独特的piezoelectric和电子元素，或者在其上不存在，或者在其上都不存在。这些属性及其多功能性使纳米技术学家将纤维素纳米晶体（CNC）视为“自然的碳纳米管”。在实际应用中使用CNCS取决于我们定制其表面化学反应并理解的能力 这些修饰如何影响其独特的特性和胶体行为。尽管纤维素纳米技术取得了进步，但仍有许多重要的挑战。对于基于CNC的材料成功开发和商业化的最紧迫的挑战也许是在多种溶剂和复合材料中优化纳米颗粒分散体。因此，可以在水溶液中进行简单，经济的功能化程序，并可以有效地修改CNC的表面化学以及功能化CNC的详细表征，对将CNC纳入为工业相关的材料的需求很高。 Moran-Mirabal研究小组开发了一种简单且廉价的方法，可以使用三嗪基衍生物功能化纤维素材料。本提案旨在评估该表面化学在Celluforce产生的CNC中的效率，并允许它们分散在具有一定极性范围的溶剂中。拟议的研究的成功完成将为Celluforce提供容易分散CNC的方法，从而使它们可以在高价值产品中以高浓度掺入。