Polyurea/Aminopropyl Isobutyl Polyhedral Oligomeric Silsesquioxane-Functionalized Graphene Nanoplatelet Nanocomposites for Force Protection Applications

被引：2

作者：

Mansourian-Tabaei, Mohammad ^{[1
,2
]}

Majdoub, Mohammed ^{[2
]}

Sengottuvelu, Dineshkumar ^{[2
]}

Stoddard, Damian L. ^{[2
,3
]}

Thirumalai, Rooban V. K. G. ^{[4
]}

Ucak-Astarlioglu, Mine G. ^{[5
]}

Al-Ostaz, Ahmed ^{[2
,6
]}

Nouranian, Sasan ^{[1
,2
]}

机构：

[1] Univ Mississippi, Dept Chem Engn, University, MS 38677 USA

[2] Univ Mississippi, Ctr Graphene Res & Innovat, University, MS 38677 USA

[3] Univ Mississippi, Dept Mech Engn, University, MS 38677 USA

[4] Mississippi State Univ, Inst Imaging & Analyt Technol, Mississippi State, MS 39762 USA

[5] US Army Engineer Res & Dev Ctr, Geotech & Struct Lab, Vicksburg, MS 39180 USA

[6] Univ Mississippi, Dept Civil Engn, University, MS 38677 USA

来源：

ACS APPLIED MATERIALS & INTERFACES | 2024年 / 16卷 / 15期

关键词：

polyurea; graphene nanoplatelets; POSS; split-Hopkinson pressure bar; force protection; MECHANICAL-PROPERTIES; SURFACE MODIFICATION; OXIDE; CARBON; HYBRID; POSS; POLYETHYLENE; RESISTANCE; NANOSHEETS; REDUCTION;

D O I：

10.1021/acsami.4c02244

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Herein, the development of new nanocomposite systems is reported based on one-part polyurea (PU) and aminopropyl isobutyl polyhedral oligomeric silsesquioxane (POSS)-functionalized graphene nanoplatelets (GNP-POSS) as compatible nanoreinforcements with the PU resin. GNP-POSS was effectively synthesized via a two-step synthesis protocol, including ultrasonication-assisted reaction and precipitation, and carefully characterized with respect to its chemical and crystalline structure, morphology, and thermal stability. FTIR and XPS spectroscopy analyses revealed that POSS interacts with the residual oxygen moieties of the GNPs through both covalent and noncovalent bonding. The X-ray diffraction pattern of GNP-POSS further revealed that the crystallinity of the GNPs was not altered after their functionalization with POSS. GNP-POSS was successfully incorporated in PU at contents of 1, 3, 5, and 10 wt % to yield PU/GNP-POSS nanocomposite films. An ATR-FTIR analysis of these films confirmed the presence of strong interfacial interactions between the urea groups of PU and the GNP-POSS functionalities. Moreover, the PU/GNP-POSS nanocomposite films exhibited enhanced thermal stability and mechanical properties compared to those of the neat PU film. The quasi-static tensile testing of the PU/GNP-POSS samples revealed remarkable enhancements in the tensile strength (from 7.9 for the neat PU to 25.1 MPa for PU/GNP-POSS) and Young's modulus (238-617 MPa), while elongation at break and toughness also showed 14 and 125% improvements, respectively. Finally, the effects of GNP-POSS content on the morphological, quasistatic tensile, and high-strain-rate dynamic behavior of the PU/GNP-POSS nanocomposite films were also investigated. Overall, the tests performed using a split-Hopkinson pressure bar setup revealed a large increase in the film strength (from 147.6 for the neat PU film to 199 MPa for the PU/GNP-POSS film) and a marginal increase in the energy density of the film (38.1-40.8 kJ/m(3)). These findings support the suitability of the PU/GNP-POSS nanocomposite films for force protection applications.

引用

页码：19625 / 19641

页数：17

共 65 条

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