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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

One-pot exfoliation and surface functionalization of MoS2: A potential nanofiller to overcome the brittleness of polystyrene (PS)

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Author(s):
Fiel, Rodrigo [1] ; Barcelos, Ingrid D. [2] ; Goncalves, Ricardo H. [3] ; Soares, Mario R. S. [1] ; Rocha, Gabriel [1] ; Silva, Caio M. P. [1] ; Mastelaro, Valmor R. [4] ; Leite, Edson R. [5]
Total Authors: 8
Affiliation:
[1] Univ Fed Sao Carlos, Dept Chem, Sao Carlos, SP - Brazil
[2] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Synchrotron Light Lab LNLS, BR-13083970 Campinas, SP - Brazil
[3] Univ Estadual Maringa, Dept Chem, Maringa, Parana - Brazil
[4] Univ Sao Paulo, Sao Carlos Inst Phys, Sao Carlos, SP - Brazil
[5] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Nanotechnol Natl Lab LNNano, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 5
Document type: Journal article
Source: Polymer; v. 233, OCT 26 2021.
Web of Science Citations: 0
Abstract

In this communication, we describe a simple one-pot approach to exfoliate and functionalize MoS2 (f-MoS2) via liquid-phase exfoliation (LPE) starting from bulk MoS2 dispersed in styrene/N-methyl pyrrolidone (NMP) solution using azobisisobutyronitrile (AIBN) as a radical initiator. The colloidal stability of f-MoS2 is achieved due to an in situ radical polymerization of styrene and functionalization on the edge sites of MoS2. Thermogravimetric analysis (TGA) showed the presence of 8.23 wt% of functionalized MoS2. The f-MoS2 was then incorporated in polystyrene (PS) matrix at different loadings (15 wt%, 30 wt% and 60 wt%) by a solution-based process using toluene as solvent. The f-MoS2/PS nanocomposites exhibited a good polymer/nanofiller interfacial interaction and promoted significant thermal stabilization in PS increasing, in our best case, the T-5% and T-50% temperatures by 91 degrees C and 15 degrees C, respectively, compared to neat PS. When increasing the f-MoS2 loading, we also noticed a dramatic decrease on the glass transition temperature (Tg) of the f-MoS2/PS nanocomposites, which has a direct correlation on its mechanical properties. As f-MoS2 loading increases the Young's modulus decreases, compared to neat PS. However, at 60 wt% f-MoS2 loading, the nanocomposite showed basically the same Young's modulus of neat PS and the strain at break increased more than a 150%, which indicates a significant load transfer between the polymer-nanofiller interface. Therefore, the f-MoS2 is a potential candidate to overcome the brittleness of PS. In addition, this simple one-pot approach opens pathways for new developments of functionalized MoS2. (AU)

FAPESP's process: 16/20493-0 - Single step exfoliation and covalent functionalization of MoS2: development of novel elastomeric materials
Grantee:Rodrigo de Souza Penha Fiel
Support Opportunities: Scholarships in Brazil - Doctorate (Direct)