Effect of polyol structure on the properties of the resultant magnetic polyurethane elastomer nanocomposites

Abstract

In this study, two types of magnetic polyurethane (PU) elastomer nanocomposites using polycaprolactone (PCL) and polytetramethylene glycol (PTMG) as polyols were synthesized by incorporating thiodiglycolic acid surface modified Fe 3 O 4 nanoparticles (TSM-Fe 3 O 4 ) into PU matrices through in situ polymerization method. TSM-Fe 3 O 4 nanoparticles were prepared using in situ coprecipitation method in alkali media and were characterized by X-ray diffraction, Fourier Transform Infrared Spectrophotometer, Transmission Electron Microscopy, and Vibrating Sample Magnetometer. The effects of PCL and PTMG polyols on the properties of the resultant PUs were studied. The morphology and dispersion of the nanoparticles in the magnetic nanocomposites were studied by Scanning Electron Microscope. It was observed that dispersion of nanoparticles in PTMG-based magnetic nanocomposite was better than PCL-based magnetic nanocomposite. Furthermore, the effect of polyol structure on thermal and mechanical properties of nanocomposite was investigated by Thermogravimetric Analysis and Dynamic Mechanical Thermal Analysis. A decrease in the thermal stability of magnetic nanocomposites was found compared to pure PUs. Furthermore, DMTA results showed that increase in glass transition temperature of PTMG-based magnetic nanocomposite is higher than PCL-based magnetic nanocomposite, which is attributed to better dispersion of TSM-Fe 3 O 4 nanoparticles in PTMG-based PU matrix. Additionally, magnetic nanocomposites exhibited a lower level of hydrophilicity compared to pure PUs. These observations were attributed to the hydrophobic behavior of TSM-Fe 3 O 4 nanoparticles. Moreover, study of fibroblast cells interaction with magnetic nanocomposites showed that the products can be a good candidate for biomedical application.

Biocompatible polyurethane/thiacalix[4]arenes functionalized Fe3O4 magnetic nanocomposites: Synthesis and properties

“…Incorporation of Fe 3 O 4 magnetic nanoparticles into organic polymer matrices to fabricate organic-inorganic nanocomposites has attracted considerable attention in many areas, such as biomedical implants and devices, drug delivery, electromagnetic interference shielding (EMI), water purification, magnetic shape memory polymers (MSMP) [9]. Polyurethane as organic matrix is highly favored because of several advantages such as excellent mechanical properties, chemical stability, blood and tissue compatibility and particularly, low cost products [10,11].…”

Synthesis and investigation of properties of thiacalix[4]arene-based polyurethane elastomers

“…The COC asymmetric and symmetric stretching vibrations of PCL are observed at 1231 and 1157 cm −1 , respectively. The absorption bands at 1098 and 1038 cm −1 are also assigned to asymmetric and symmetric COC stretching vibrations of urethane groups . All the FTIR spectra confirm the formation of a polyurethane structure.…”

“…In this investigation, NCO‐terminated polyurethane prepolymer was synthesized according to a recommended procedure . For this purpose, appropriate amounts of IPDI and previously degassed PCL (with a mole ratio of 2:1) were reacted by step growth polymerization in a three‐necked flask equipped with reflux condenser, mechanical stirrer, heating oil bath, dropping funnel and nitrogen inlet and outlet.…”

A dual‐induced self‐expandable stent based on biodegradable shape memory polyurethane nanocomposites (PCLAU/Fe3O4) triggered around body temperature

“…For better dispersion of nanoparticles, their surfaces were somewhat (non)covalently modified in order to improve their miscibility with the polymer matrix and create nanoscale netpoints in the polymer matrix. Surface modification of Fe 3 O 4 nanoparticles could improve their compatibility with polymer matrix and result in uniform dispersion in the matrix . OA is one of the most widely used kinds of surfactants to modify Fe 3 O 4 nanoparticles due to its high affinity with Fe 3 O 4 nanoparticles .…”

“…Surface modification of Fe 3 O 4 nanoparticles could improve their compatibility with polymer matrix and result in uniform dispersion in the matrix. 39 OA is one of the most widely used kinds of surfactants to modify Fe 3 O 4 nanoparticles due to its high affinity with Fe 3 O 4 nanoparticles. 35,40 It was reported that OA could form a single layer or bi-layers coated structures on the surface of Fe 3 O 4 nanoparticles.…”