Impact of clay modifier on structure, thermal, mechanical and transport properties in polyurethane/Maghnite nanocomposites as barrier materials

Abstract

In the present study, thermoplastic polyurethane (TPU) nanocomposites based on maghnite as an inorganic reinforcing phase were synthesized. The result of this study was to evaluate the gas barrier property of a thermoplastic polyurethane (TPU) material containing clay nanoparticles. The preparation of the thermoplastic polyurethane prepolymer with NCO terminations was carried out by the in situ solution polymerization method. The clay was previously modi ed by intercalating 12-aminododecanoic acid NH 2 (CH 2 ) 11 COOH (12-Mag) molecules. The polyethylene glycol / tolylene 2,4-diisocyanate (PEG/TPI) matrix was extensively compatibilized with the organo-modi ed clay, 12-Maghnite. The objective of this study is to evaluate the effects of the use of organoclay on the development of thermoplastic polyurethane (TPU) nanocomposites composed of 1, 3, 5 and 7 wt% organoclay. The results obtained by XRD, by Transmission and Scanning Electron Microscopy (TEM, SEM) revealed that the modi ed maghnite was well dispersed at 1 wt% in the polyurethane matrix. Thermogravimetric (TG) tests have shown that the nanocomposites samples also have better thermal stability. Using the membrane separation test device, gas permeability was examined. Signi cant improvements in barrier properties were observed. The mechanical properties of the nanocomposites were evaluated as a function of the clay ller used and the TPU matrix.

Influence of Clay on Structure, Thermal Properties and Mechanics of Poly(vinyl acetate)/Maghnite Nanocomposites.

“…Organic‐inorganic hybrid materials have received much attention in recent decades due to their unique properties. This newly developed advanced material exhibits comprehensive properties of two phases, despite the low content of inorganic fillers [7] . Due to weaker interactions, polymers containing inorganic fillers have a strong tendency to agglomerate in the polymer matrix.…”

“…The nanolayer structure of MMT has significant specific surface area. Compared to the polymer chains, this leads to the formation of multiple covalent bonds between the different MMT layers [15] . Nanoscale fillers with clay‐like reinforcing functional groups are the most commonly used, according to a large body of research.…”

“…This degrades the electrical and mechanical properties of the polymer composite. [8,9] The introduction of nanoscale functional groups, including metal oxides, can overcome this tendency. These have become more widely used in recent years.…”

“…Due to weaker interactions, polymers containing inorganic fillers have a strong tendency to agglomerate in the polymer matrix. This degrades the electrical and mechanical properties of the polymer composite [8,9] . The introduction of nanoscale functional groups, including metal oxides, can overcome this tendency.…”

“…Compared to the polymer chains, this leads to the formation of multiple covalent bonds between the different MMT layers. [15] Nanoscale fillers with clay-like reinforcing functional groups are the most commonly used, according to a large body of research. The aim of these studies was the synthesis of structure-property relationships of PVAC/ Maghnite nanocomposite polymers for sound amplification.…”