Reinforcement of natural rubber latex with nanocrystalline cellulose

纳米晶纤维素增强天然胶乳

• 批准号: 529768-2018
• 负责人: Mekonnen, Tizazu
• 金额: $ 1.82万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=659502
• 关键词: Reinforcement; natural; rubber; latex; nanocrystalline

Cellulose is the most abundant natural polymer on earth. The value of the cellulose in trees or other plants**increases by several orders of magnitude when it undergoes a controlled extraction to produce a uniform**crystalline building block, known as cellulose nanocrystal (CNC). CNCs are rod-shaped nanoparticles with**outstanding stiffness and hardness, high aspect ratio and surface area, low density, and abundant -OH groups**for modification; these properties make them appealing reinforcing agents in polymers and rubbers.**CelluForce, a world leader in the commercial development of CNC, is interested in incorporating CNCs into**natural rubber latex materials; however, so far, they have been unable to do so because they have been unable**to achieve dispersion of CNCs in rubber, as these particles tend to aggregate and agglomerate due to surface**area and volume effects. Achieving dispersion is critical to taking advantage of the enhanced reinforcement and**barrier performance that CNCs can offer for latex materials.**This project will investigate the interaction of hydrophilic CNC with the hydrophobic rubber matrix, with an**ultimate goal of developing a process technology for effective dispersion of CNC in rubber matrices, with a**focus on latex systems for glove applications. Natural rubber (NR) is typically obtained from rubber trees as a**stable dispersion of polymeric particles in water, and CNCs form a stable particle dispersion in water. We will**use latex particles as a matrix for colloidal CNC that takes advantage of the compatibility between the NR latex**and the colloidal CNC. Prof. Mekonnen has extensive experience in rubber latex nanocomposites, which,**combined with CelluForce's CNC expertise, will enable the team to tackle the dispersion challenge, thereby**removing a major barrier to the commercialization of CNC-rubber nanocomposite technology. We will**optimize the process parameters (e.g. mixing, pH, surface modification of CNC, surfactants, etc.) for the**incorporation of CNC into the NR. The results of this study will then be applied to develop CNC - rubber**nanocomposites for gloves and condoms applications.

纤维素是地球上最丰富的天然聚合物。树木或其他植物中纤维素的价值 ** 增加了几个数量级，当它经历了一个控制提取，以产生一个统一的 ** 结晶结构单元，称为纤维素纤维素（CNC）。CNC是棒状纳米颗粒，具有 ** 出色的刚度和硬度、高纵横比和表面积、低密度和丰富的-OH基团 ** 用于改性;这些特性使它们成为聚合物和橡胶中有吸引力的增强剂。** CelluForce是CNC商业开发的世界领导者，有兴趣将CNC掺入天然橡胶胶乳材料中;然而，到目前为止，他们还无法做到这一点，因为他们无法实现CNC在橡胶中的分散，因为这些颗粒由于表面积和体积效应而易于聚集和团聚。实现分散对于利用CNC为乳胶材料提供的增强增强和 ** 阻隔性能至关重要。**该项目将研究亲水性CNC与疏水性橡胶基质的相互作用，最终目标是开发一种工艺技术，使CNC在橡胶基质中有效分散，重点是用于手套应用的乳胶系统。天然橡胶（NR）通常作为聚合物颗粒在水中的稳定分散体从橡胶树获得，并且CNC在水中形成稳定的颗粒分散体。我们将 ** 使用乳胶颗粒作为胶体CNC的基质，利用NR乳胶 ** 和胶体CNC之间的相容性。Mekonnen教授在橡胶胶乳纳米复合材料方面拥有丰富的经验，** 结合CelluForce的CNC专业知识，将使团队能够应对分散挑战，从而 ** 消除CNC橡胶纳米复合材料技术商业化的主要障碍。我们将 ** 优化工艺参数（如混合、pH值、CNC表面改性、表面活性剂等）** 将CNC并入NR。这项研究的结果将应用于开发CNC -橡胶 ** 纳米复合材料的手套和避孕套的应用。