Incorporating Hydrophobic Cellulose Nanocrystals inside Latex Particles via Mini-Emulsion Polymerization,Macromolecular Reaction Engineering

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Incorporating Hydrophobic Cellulose Nanocrystals inside Latex Particles via Mini-Emulsion Polymerization
Macromolecular Reaction Engineering ( IF 1.8 ) Pub Date : 2021-08-11 , DOI: 10.1002/mren.202100023
Amir Saeid Pakdel ₁ , Emily D. Cranston ₂ , Marc A. Dubé ₁

Affiliation

Hydrophobic cellulose nanocrystals (CNCs) are encapsulated inside poly(butyl acrylate/vinyl acetate/acrylic acid) latex particles via mini-emulsion polymerization (MEP). To achieve a genuine MEP, the effects of the concentration of surfactants (sodium dodecyl sulfate/Disponil A3065) and a hydrophobic agent (octadecyl acrylate (ODA)) are optimized in the presence of 0.5 wt% CNC. Using a combination of surfactant and ODA concentrations leading to a particle nucleation method restricted to the monomer droplets, the effects of CNC loading up to 1.5 wt% on the polymerization process and final nanocomposite properties are studied. Despite an increase in particle size and a lower rate of polymerization at higher CNC loadings, the droplet nucleation mechanism remains dominant up to 1.25 wt% CNC loading. Pressure-sensitive adhesive (PSA) performance for nanocomposites produced using hydrophobic CNCs in MEP decreases whereas performance improves considerably when using hydrophilic and partially hydrophobic CNCs in conventional emulsion polymerization. These results shed light on emulsion polymerization technique selection and CNC surface properties for greener industrial production of water-based PSAs.

中文翻译：

通过微乳液聚合将疏水性纤维素纳米晶体掺入乳胶颗粒中

疏水性纤维素纳米晶体 (CNC) 通过微乳液聚合 (MEP) 封装在聚（丙烯酸丁酯/醋酸乙烯酯/丙烯酸）乳胶颗粒内。为了实现真正的 MEP，表面活性剂（十二烷基硫酸钠/Disponil A3065）和疏水剂（丙烯酸十八酯（ODA））浓度的影响在 0.5 wt% CNC 的存在下进行了优化。使用表面活性剂和 ODA 浓度的组合导致仅限于单体液滴的粒子成核方法，研究了 CNC 负载高达 1.5 wt% 对聚合过程和最终纳米复合材料性能的影响。尽管在更高的 CNC 负载下粒径增加和聚合速率降低，但液滴成核机制仍然占主导地位，直至 1.25 wt% CNC 负载。在 MEP 中使用疏水性 CNCs 生产的纳米复合材料的压敏粘合剂 (PSA) 性能下降，而在传统乳液聚合中使用亲水性和部分疏水性 CNCs 时性能显着提高。这些结果阐明了乳液聚合技术选择和 CNC 表面性能，以实现更绿色的水性 PSA 工业生产。

更新日期：2021-10-19

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