Friction spot welding of PMMA with PMMA/silica and PMMA/silica-g-PMMA nanocomposites functionalized via ATRP

POLYMER

卷:55

Article

Junior, Wiebke S.¹  Emmler, Thomas¹  Abetz, Clarissa¹  Handge, Ulrich A.¹  dos Santos, Jorge E.²  Amancio-Filho, Sergio T.^2,3  Abetz, Volker^1,4 

[1] Helmholtz Zentrum Geesthacht, Polymer Res Inst, D-21502 Geesthacht, Germany

[2] Helmholtz Zentrum Geesthacht, Inst Mat Res, D-21502 Geesthacht, Germany

[3] Hamburg Univ Technol TUHH, Inst Polymer Composites M11, D-21073 Hamburg, Germany

[4] Univ Hamburg, Inst Phys Chem, D-20146 Hamburg, Germany

关键词: PMMA;    Nanocomposites;    Friction spot welding;   

DOI  :  10.1016/j.polymer.2014.08.022

来源: Elsevier

【 摘 要 】

In the present study, the feasibility of Friction Spot Welding (FSpW) of a commercial-grade poly(methyl methacrylate) (PMMA) (PMMA GS) and PMMA 6N/functionalized silica (SiO2) nanocomposites was investigated. The silica nanoparticles were functionalized via atom transfer radical polymerization (ATRP) with PMMA chains to achieve a uniform dispersion in the polymer matrix. The successful functionalization of silica nanoparticles with PMMA chains via ATRP was evaluated by ATR-FT-IR and TGA measurements. Rheological investigations of the silica nanocomposites showed a plateau of the storage modulus G' at low frequencies (0.01-0.03 rad/s) as a result of elastic particle-particle interactions. Overlap friction spot welds consisting of PMMA GS and a 2 wt% SiO2-g-PMMA nanocomposite were successfully prepared and compared to spot joints of PMMA GS welded with PMMA 6N and PMMA 6N/silica nanocomposite with 2 wt% unfunctionalized silica nanoparticles. Raman mappings of selected areas of cross-sectional plastographic specimens revealed an increased mixing behavior between the two polymer plates in the case of PMMA GS/2 wt% SiO2-g-PMMA joints. Although the joints welded with PMMA 6N/silica nanocomposites showed a reduction of 22% in lap shear strength and 21% displacement at peak load compared with the neat PMMA spot welds, they can compete with other state-of-the-art PMMA welding techniques such as thermal bonding and ultrasonic welding, which indicates the potential of friction spot welding as an alternative fabrication technology for joining future nanocomposite engineering parts. (C) 2014 Elsevier Ltd. All rights reserved.

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