Deshpande Tushar D, Singh Yogesh R G, Patil Sandip, Joshi Yogesh M, Sharma Ashutosh
Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur-208016, UP, India.
Soft Matter. 2019 Jul 17;15(28):5739-5747. doi: 10.1039/c9sm00533a.
In the present study, the adhesive and viscoelastic properties of polydimethylsiloxane (PDMS) based nanocomposite pressure sensitive adhesives (PSAs) with embedded electrospun polyacrylonitrile (PAN) and polyvinyl alcohol (PVA) nanofibers as fillers were investigated. PDMS nanocomposite adhesive films using PAN and PVA nanofibers were synthesized by dispersing fillers in the matrix by a solvent mixing process. The adhesion strength and reusability of the prepared nanocomposite PSA films were measured using peel tests as the fraction of nanofibers in the polymer matrix is increased. The variations of the adhesive properties of the PSAs as function of the type and loading of filler were related to their rheological properties in terms of shear and elastic moduli. Although 3-fold enhancement of the adhesion strength was achieved with 0.5 wt% loading for both types (PAN and PVA) of nanocomposites as compared to elastic PDMS, the composite adhesive with PAN nanofibers can provide a superior balance of rheological properties, resulting in improved reusability over other PSAs. The differences in the adhesion and viscoelastic properties of the composite PSAs are attributed to the polymer chemistry, processability, and architecture of the electrospun nanofibers in the soft PDMS matrix.
在本研究中，对以聚二甲基硅氧烷（PDMS）为基础、嵌入电纺聚丙烯腈（PAN）和聚乙烯醇（PVA）纳米纤维作为填料的纳米复合压敏胶粘剂（PSA）的粘附和粘弹性性能进行了研究。通过溶剂混合工艺将填料分散在基质中，合成了使用PAN和PVA纳米纤维的PDMS纳米复合胶粘剂薄膜。随着聚合物基质中纳米纤维比例的增加，使用剥离试验测量了所制备的纳米复合PSA薄膜的粘附强度和可重复使用性。PSA的粘附性能随填料类型和负载量的变化与其在剪切模量和弹性模量方面的流变性能相关。与弹性PDMS相比，两种类型（PAN和PVA）的纳米复合材料在负载量为0.5 wt%时，粘附强度提高了3倍，然而，含有PAN纳米纤维的复合胶粘剂能提供更优异的流变性能平衡，从而使其可重复使用性优于其他PSA。复合PSA在粘附和粘弹性性能上的差异归因于软质PDMS基质中电纺纳米纤维的聚合物化学性质、可加工性和结构。
