Aldehyde-functionalized cellulose nanocrystals (CN) with two aldehyde contents were produced by periodate oxidation and gentle sonication. The aldehyde-functionalized CNCs were shown to be an effective stabilizer in the Pickering emulsion polymerization of acrylate monomers using potassium persulfate (KPS)/metabisulfite redox initiation system at 50 °C without any added surfactant. The effect of CNC content on the particle size, zeta-potential, colloidal stability and film properties were discussed. CNCs with the highest aldehyde content impart better colloidal stability to the polymer dispersion and lower particle size. The stabilization process was explained by the reaction of bisulfite with aldehyde groups borne by CNC, forming an adduct that contributes to the initiation of the polymerization and nucleation of polymer particles. This favors the effective attachment of CNCs onto the polymer particle, which is prerequisite for the effective Pickering stabilization process. The optical and mechanical properties of the nanocomposite films obtained by simple casting of the polymer dispersion and water evaporation were also investigated by transmittance and dynamic mechanical analysis (DMA). Better transparency was observed for films prepared in the presence of CNCs with the highest aldehyde content, while a reverse trend was noted for the mechanical properties.

通过高碘酸氧化和温和的超声处理，生成醛含量为两个醛的醛官能化纤维素纳米晶体（CN）。醛官能化的CNCs在使用过硫酸钾（KPS）/重亚硫酸盐氧化还原引发体系，不添加任何表面活性剂的情况下，是丙烯酸酯单体的Pickering乳液聚合的有效稳定剂。讨论了CNC含量对粒径，Zeta电位，胶体稳定性和薄膜性能的影响。醛含量最高的CNCs为聚合物分散体提供了更好的胶体稳定性，并降低了粒径。亚硫酸氢盐与CNC携带的醛基反应形成了加合物，该加合物有助于引发聚合物颗粒的聚合和成核，从而说明了稳定过程。这有利于将CNC控制器有效地附着到聚合物颗粒上，这是有效的Pickering稳定过程的前提。还通过透射率和动态力学分析（DMA）研究了通过简单地浇铸聚合物分散体和水蒸发获得的纳米复合膜的光学和机械性能。对于存在最高醛含量的CNC薄膜，观察到的薄膜具有更好的透明性，而机械性能却出现了相反的趋势。还通过透射率和动态力学分析（DMA）研究了通过简单地浇铸聚合物分散体和水蒸发获得的纳米复合膜的光学和机械性能。对于存在最高醛含量的CNC薄膜，观察到的薄膜具有更好的透明性，而机械性能却出现了相反的趋势。还通过透射率和动态力学分析（DMA）研究了通过简单地浇铸聚合物分散体和水蒸发获得的纳米复合膜的光学和机械性能。对于存在最高醛含量的CNC薄膜，观察到的薄膜具有更好的透明性，而机械性能却出现了相反的趋势。