Pushing the Limits with Cellulose Nanocrystal Loadings in Latex‐Based Pressure‐Sensitive Adhesive Nanocomposites,Macromolecular Reaction Engineering

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Pushing the Limits with Cellulose Nanocrystal Loadings in Latex‐Based Pressure‐Sensitive Adhesive Nanocomposites
Macromolecular Reaction Engineering ( IF 1.8 ) Pub Date : 2020-08-02 , DOI: 10.1002/mren.202000027
Vida A. Gabriel ₁ , Emily D. Cranston ₂ , Marc A. Dubé ₁

Affiliation

Cellulose nanocrystals (CNCs) are a naturally sourced, nontoxic, nanoparticle known to improve tack, peel strength, and shear resistance simultaneously when incorporated into nanocomposite latexes produced for pressure‐sensitive adhesive (PSA) applications. In this study, methods for incorporating CNCs into a butyl acrylate/styrene/acrylic acid (91.5/4.5/4.0 wt%) seeded semibatch emulsion polymerization for the production of PSAs are presented. Past work has revealed a limit of 1.0–2.0 wt% (based on monomer) CNC loadings due to latex instability. In this work, CNC loadings of up to 4.0 wt% in a stable latex with 40 wt% solids are achieved by utilizing all of the available water in the formulation to maximize CNC redispersion. The CNC addition method is studied (i.e., in the seed, in the feed, or partitioned in both) and adhesive performance results indicate that there are no significant benefits to where the CNCs are dispersed in situ during polymerization. However, the quality of the CNC‐water dispersion is pivotal to ensuring latex homogeneity and therefore, adhesive film quality. Though CNCs improved adhesive strength at low concentrations, their enhancing effects are modest when used with a commercially competitive base‐case PSA formulation.

中文翻译：

推动基于胶乳的压敏胶粘纳米复合材料中纤维素纳米晶体负载的极限

纤维素纳米晶体（CNC）是天然来源的无毒纳米颗粒，已知将其掺入为压敏胶粘剂（PSA）应用而生产的纳米复合胶乳中时，可以同时提高粘性，剥离强度和抗剪切性。在这项研究中，提出了将CNCs掺入丙烯酸丁酯/苯乙烯/丙烯酸（91.5 / 4.5 / 4.0 wt％）种子的半间歇乳液聚合中以生产PSA的方法。过去的工作表明，由于胶乳的不稳定性，CNC的负载量限制为1.0-2.0 wt％（基于单体）。在这项工作中，通过利用配方中所有可用的水来最大化CNC重分散，在固体含量为40 wt％的稳定胶乳中，CNC负载量最高可达4.0 wt％。研究了CNC添加方法（即在种子，饲料中，粘合性能结果表明，在聚合过程中将CNC分散在原位没有明显的好处。但是，CNC水分散体的质量对于确保乳胶均匀性和胶粘膜质量至关重要。尽管CNCs在低浓度下改善了粘合强度，但与具有商业竞争力的基础PSA配方一起使用时，其增强作用是中等的。

更新日期：2020-08-02

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