Crosslinking of Pressure-Sensitive Adhesives with Polymer-Grafted Nanoparticles
Crosslinking of Pressure-Sensitive Adhesives with Polymer-Grafted Nanoparticles
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DOI：
10.1021/acsami.1c22997
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发表时间：
2022-02-11
影响因子：
9.5
通讯作者：
Macfarlane, Robert
中科院分区：
文献类型：
--
作者：
Desroches, Griffen;Wang, Yuping;Macfarlane, Robert
纳米复合填料颗粒提供了多种机械增强压敏粘合剂（PSA）的途径，因为它们的大表面积与体积比提供了有效交联多个聚合物链的方法。因此，通过设计与周围聚合物基质形成多种物理和化学相互作用的颗粒结构，同时确保颗粒分散并防止颗粒聚集，可以实现重大进步。了解纳米颗粒交联点和 PSA 聚合物之间的这种多价相互作用如何影响材料机械性能，将提供有关聚合物复合材料中机械结构-性能关系的有用科学知识，以及合成有用 PSA 材料的新途径。在此，我们报道了使用由接枝到SiO2纳米粒子（NP）表面的聚（丙烯酸正丁酯-共-丙烯酸）链组成的聚合物接枝纳米粒子（PGNP）来内聚增强PSA薄膜以抵抗剪切应力，而不损害其粘合性能。使用丙烯酸修饰的 PGNP 可以通过金属盐配位进行离子交联，与物理缠结结合使用，从而使剪切阻力提高 33%，在静态负载下的保持时间延长 3 倍。此外，还探讨了 PGNP/交联剂负载量、聚合物接枝长度和核心纳米颗粒尺寸等材料参数对机械性能的影响，为使用 PGNP 来合理设计基于聚合物复合材料的压敏胶提供了见解。
Nanocomposite filler particles provide multiple routes to mechanically reinforce pressure-sensitive adhesives (PSAs), as their large surface area to volume ratios provide a means of effectively crosslinking multiple polymer chains. A major advancement could therefore be enabled by the design of a particle architecture that forms multiple physical and chemical interactions with the surrounding polymer matrix, while simultaneously ensuring particle dispersion and preventing particle aggregation. Understanding how such multivalent interactions between a nanoparticle crosslinking point and the PSA polymer affect material mechanical performance would provide both useful scientific knowledge on the mechanical structure- property relationships in polymer composites, as well as a new route to synthesizing useful PSA materials. Herein, we report the use of polymer-grafted nanoparticles (PGNPs) composed of poly(nbutyl acrylate-co-acrylic acid) chains grafted to SiO2 nanoparticle (NP) surfaces to cohesively reinforce PSA films against shear stress without compromising their adhesive properties. The use of acrylic acid-decorated PGNPs allows for ionic crosslinking via metal salt coordination to be used in conjunction with physical entanglement, yielding 33% greater shear resistance and up to 3-fold longer holding times under static load. In addition, the effects of material parameters such as PGNP/crosslinker loading, polymer graft length, and core nanoparticle size on mechanical properties are also explored, providing insights into the use of PGNPs for the rational design of polymer composite-based PSAs.