Acrylonitrile‐butadiene‐lignin thermoplastic rubber adhesive for enhanced metal‐to‐metal joining

材料科学 胶粘剂 复合材料 热塑性塑料 热固性聚合物 天然橡胶 ABS树脂 热塑性弹性体 抗剪强度(土壤) 粘接 聚合物 图层(电子) 共聚物 环境科学 土壤科学 土壤水分
作者
Zeyang Yu,Nihal Kanbargi,Sumit Gupta,Yongsoon Shin,Yao Qiao,Christopher C. Bowland,Daniel R. Merkel,Kevin L. Simmons,Amit K. Naskar
出处
期刊:Polymer Composites [Wiley]
卷期号:45 (8): 7178-7190 被引量:3
标识
DOI:10.1002/pc.28258
摘要

Abstract With the growing requirement for lightweight structural materials in automotive, aerospace, and infrastructure applications, multi‐material joints made with adhesive have attracted intense research interest. Commercial thermoset adhesives are one‐time cures, and difficult to disassemble the bonded components for repair and recycling. Our prior work with a thermoplastic acrylonitrile‐butadiene‐lignin rubber (ABL) addresses this sustainability/recycling challenge, but the adhesive exhibits deficient joining strength compared to standard thermosets. Here, we modify the ABL matrix by loading particulate fillers to enhance its modulus and toughness. The goal is to manufacture a cure‐free thermoplastic adhesive system with a simple dispensing protocol and characteristic ductility combined with a high yield stress for improved shear strength of a bonded joint. Fumed silica (FS) and epoxidized glass spheres (EGS) were used as fillers in the ABL to promote the dispersion of lignin particles that tailored the functionalities and free energy components of the adhesive surface. With optimal loading of FS (5 wt%) and EGS (30 wt%) in the ABL adhesive matrix, the lap‐shear strength of the bonded aluminum joint was elevated by 128%, compared to the neat ABL, reaching 21 MPa, which is 90% of the performance of a commercial epoxy‐based adhesive. Highlights A partly renewable filler‐toughened thermoplastic adhesive has been developed. This thermoplastic gives nearly equivalent performance of adhesively bonded aluminum joint compared to standard thermosets. Experimental and simulation data help understand the adhesive reinforcing mechanism by the fillers.
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