Pancorowati Dhita Azzahra, Cho Wansu, Park Chiyoung
Department of Energy Science and Engineering, Daegu Gyeongbuk Institute of Science and Technology, 333, Techno Jungang Daero, Hyeonpung-Eup, Dalseong-gun, Daegu, 42988, Republic of Korea.
Macromol Rapid Commun. 2025 Jun;46(12):e2401063. doi: 10.1002/marc.202401063. Epub 2025 Mar 19.
Pressure-sensitive adhesives (PSAs) bond surfaces with minimal pressure, eliminating the need for heat, water, or solvents. Ethylene vinyl acetate (EVA) is a well-established polymer in hot melt adhesives; however, research on EVA-based PSAs is limited. This study introduces nonylated diphenylamine (NDPA), a liquid derivative of diphenylamine, as a novel tackifier and antioxidant for EVA-based PSAs. By simply mixing NDPA with EVA at elevated temperatures, an EVA-based PSA is successfully formulated without the use of toxic solvents. The molecular structure of NDPA, characterized by alkyl chains and secondary amines, allows it to interact effectively with both the polyethylene (PE) and vinyl acetate moieties in EVA. These interactions significantly enhance the viscoelastic properties and adhesive strength of the formulations. Notably, the addition of NDPA increases lap shear strength from 98.67 kPa for pure EVA to 516.67 kPa for the EVA-NDPA formulation containing 40 wt.% NDPA. Furthermore, a 50 wt.% inclusion of NDPA achieves the highest peel strength of 6.5 N mm⁻¹, surpassing that of commercial PSA tape. Additionally, NDPA contributes to preventing oxidative degradation, significantly enhancing the longevity of adhesive properties and positioning it as a promising additive for improved EVA-based PSA formulations.
压敏胶粘剂（PSA）只需极小的压力就能粘结表面，无需加热、水或溶剂。乙烯醋酸乙烯酯（EVA）是热熔胶粘剂中一种成熟的聚合物；然而，基于EVA的PSA的研究有限。本研究引入了二苯胺的液体衍生物壬基化二苯胺（NDPA），作为基于EVA的PSA的新型增粘剂和抗氧化剂。通过在高温下简单地将NDPA与EVA混合，成功配制出了一种不使用有毒溶剂的基于EVA的PSA。NDPA的分子结构以烷基链和仲胺为特征，使其能够与EVA中的聚乙烯（PE）和醋酸乙烯酯部分有效相互作用。这些相互作用显著增强了配方的粘弹性和粘合强度。值得注意的是，添加NDPA使搭接剪切强度从纯EVA的98.67 kPa提高到含40 wt.% NDPA的EVA-NDPA配方的516.67 kPa。此外，包含50 wt.% NDPA时可实现最高剥离强度6.5 N mm⁻¹，超过了商业PSA胶带。此外，NDPA有助于防止氧化降解，显著提高粘合性能的寿命，并使其成为改进基于EVA的PSA配方的有前途的添加剂。
