Vrabič-Brodnjak Urška, Vidmar Aljana
Faculty of Natural Sciences and Engineering, Department of Textiles, Graphic Arts and Design, University of Ljubljana, Aškerčeva 12, 1000 Ljubljana, Slovenia.
Molecules. 2025 Jul 26;30(15):3136. doi: 10.3390/molecules30153136.
The development of bio-based adhesives as sustainable alternatives to synthetic formulations presents a significant opportunity for advancing environmental sustainability in packaging applications. This research aimed to develop and evaluate a bio-based adhesive derived from bacterial nanocellulose (BNC), aloe vera and its mixtures as a potential replacement for commercial synthetic adhesives. Aloe vera, selected for its polysaccharide-rich composition, served as a natural polymeric matrix, while BNC contributed reinforcing properties. The adhesive formulations, with and without BNC, were compared to a commercial adhesive to assess their mechanical performance. T-peel and shear tests were conducted on smooth and rough paper substrates to evaluate adhesive strength. The bio-based adhesive incorporating BNC demonstrated superior shear and peel strength on rough substrates due to enhanced mechanical interlocking within the fibrous structure of paper, whereas performance on smooth surfaces was hindered by uneven BNC distribution, reducing adhesive-substrate interaction. Although the commercial adhesive achieved higher absolute maximum force values, the bio-based formulation exhibited comparable mechanical stability under specific conditions. These findings underscore the influence of substrate properties and application methods on adhesive performance, highlighting the potential of bio-based adhesives in packaging applications and the need for further formulation optimization to fully realize their advantages over traditional synthetic adhesives.
开发生物基粘合剂作为合成配方的可持续替代品，为推进包装应用中的环境可持续性提供了重大机遇。本研究旨在开发和评估一种由细菌纳米纤维素（BNC）、芦荟及其混合物衍生的生物基粘合剂，作为商业合成粘合剂的潜在替代品。因其富含多糖的成分而被选中的芦荟作为天然聚合物基质，而BNC则提供增强性能。将含和不含BNC的粘合剂配方与一种商业粘合剂进行比较，以评估它们的机械性能。在光滑和粗糙的纸质基材上进行T型剥离和剪切试验，以评估粘合强度。由于在纸张纤维结构内增强了机械互锁，含有BNC的生物基粘合剂在粗糙基材上表现出优异的剪切和剥离强度，而在光滑表面上的性能则受到BNC分布不均的阻碍，降低了粘合剂与基材的相互作用。尽管商业粘合剂获得了更高的绝对最大力值，但生物基配方在特定条件下表现出相当的机械稳定性。这些发现强调了基材性能和应用方法对粘合性能的影响，突出了生物基粘合剂在包装应用中的潜力，以及进一步优化配方以充分实现其优于传统合成粘合剂的优势的必要性。
