Incorporation of Multi‐Walled Carbon Nanotubes into Biodegradable Telechelic Prepolymers

Abstract

Biodegradable lactic‐acid‐based telechelic prepolymers incorporating CNTs were prepared. The products were characterized by FTIR, TGA, DSC, POM, 1H and 13C NMR, TEM, and FESEM. The results indicated that hydroxy‐terminated telechelic prepolymers were obtained. According to the TGA curves, the initial thermal decomposition temperatures of the prepolymers incorporating carboxylic CNTs were higher than those of the pure prepolymers. Amorphous and crystalline prepolymers incorporating CNTs were obtained, while the spherocrystal morphologies were not changed by the addition of the CNTs. The carboxylic CNTs were coated with PLA polymers after polymerization and well dispersed in the prepolymer matrix.magnified image

Preparation and Characterization of Polymer−Inorganic Nanocomposites by In Situ Melt Polycondensation of l-Lactic Acid and Surface-Hydroxylated MgO

“…Resonances associated with methyl, methine, and carbonyl groups next to the terminal hydroxyl or carboxyl groups were not observed because of the relatively long chain length (DP ∼165 units, determined from 1 H NMR). 47 All the PLA nanocomposites showed 1 H and 13 C NMR spectra similar to those of pure PLA; the typical spectra of PLA-0.05%MgO is presented in Figures 3A and 4A. Shifts of any peaks attributed to the PLA chains polymerized on the MgO surface were not detected for these PLA nanocomposites.…”

“…The three-peak pattern centered at 77 ppm is due to the solvent CDCl 3 . Resonances associated with methyl, methine, and carbonyl groups next to the terminal hydroxyl or carboxyl groups were not observed because of the relatively long chain length (DP ∼165 units, determined from 1 H NMR) . All the PLA nanocomposites showed 1 H and 13 C NMR spectra similar to those of pure PLA; the typical spectra of PLA-0.05%MgO is presented in Figures A and A.…”

“…The same phenomena occurred in multiwalled carbon nanotubes-PLA telechelic prepolymers. 47 The solid-state 1 H NMR spectra for free PLA and PLA-g-MgO are shown in Figure 3B. Two broad resonance peaks at 1.41 and 5.03 ppm were attributed to the methyl and methine proton resonances from the main chain of free PLA.…”

The decoration of multi-walled carbon nanotubes with nickel oxide nanoparticles using chemical method

“…Carbon nanotubes (CNTs) have attracted a lot of attention since 1991 due to their unique molecular geometry, the excellent electronic, thermal, and mechanical properties [2,3,6,13,22,24,28]. Over the past two decades, their outstanding properties and significant potential applications in nanoscience and nanotechnology cause to carbon nanotubes (CNTs) have received a considerable attention in scientific studies and industrial applications [3,6,22,28].…”

Degradation Classification of 3D Printing Thermoplastics Using Fourier Transform Infrared Spectroscopy and Artificial Neural Networks

“…They used FTIR and XPS to analyze the surface chemistry of the samples. Song et al [4] reported biodegradable lactic-acid-based telechelic pre-polymers incorporating CNTs characterized by FTIR, TGA, DSC, POM, and so on. Wu and Liao [5] reported the production of new biodegradable nanocomposites from polyactide (PLA), tetraethoxysilane (TEOS), and wood flour (WF) using an in-sihi sol-gel process and a melt blending method.…”