Semi‐aromatic polyimide/Ag nanocomposite derived from vanillin

Abstract

The development of bioprecursor polyimide/Ag nanocomposites (PI/Ag NCs) is reported in this investigation. Semiaromatic bioprecursor PI was successfully synthesized through direct polycondensation reaction between aromatic diamine containing pyridine ring and aliphatic dianhydride. Aromatic diamine as a monomer was synthesized using a renewable resource, vanillin. The main attractive aspects of this PI are the renewable origin of the diamine, presence of pyridine and high aromatic rings content, as well as aliphatic content on the polymer backbone. The structure of synthesized monomer and PI were proven by FTIR, and nuclear magnetic resonance. The PI/Ag NCs containing 3, 5, and 7 wt % of Ag nanoparticles (Ag NPs) were prepared through solution technique and the resulting NCs were characterized by Fourier transform infrared spectra, wide angle X‐ray diffraction, transmission electron microscopy (TEM), and thermogravimetric analysis (TGA). TEM results showed that the Ag NPs were dispersed homogeneously in the PI matrix on nanoscale. TGA results indicated improving in thermal properties of PI/Ag NCs compared to the neat PI due to the interaction between the PI matrix and the Ag NPs. Antibacterial activity of PI/Ag NCs was tested by the disk diffusion method using Escherichia coli as model strain of gram‐negative bacteria. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44001.

Recent Advances in Renewable Polymer Production from Lignin-Derived Aldehydes

“…Among a wide range of aromatic monomers can be derived from lignin [ 67 ], only vanillin production is currently industrialized, which makes vanillin a particularly attractive monomer for polymer synthesis [ 63 , 68 ]. In earlier applications, vanillin is commonly functionalized to make epoxy resins [ 69 , 70 , 71 ] by adding a second alcohol [ 72 ] and used to make polymeric composite materials [ 73 , 74 ] and resins [ 75 , 76 , 77 ]. More recently, divanillin is used as a polymer precursor.…”

New High-Performance Materials: Bio-Based, Eco-Friendly Polyimides

“…The casted films displayed a homogeneous dispersion of Ag nanoparticles within the bioPI matrix due to the high compatibility of the composites' elements. This resulted in Ag-induced, partial crystallinity, improved thermal properties (Td10 from 317°C up to 357°C, depending on the Ag amount), and antibacterial activity against E. coli [49].…”

Preparation and Properties of Graphene/ODA-PMDA-NTADA Copolyimide Nanocomposites Based onKH550-modification

“…Furthermore, the copolycondensation polymerization reaction disrupts the regularity of the entire polymer molecular chain, thereby improving its solubility or other properties [9]. The inclusion of organic or inorganic materials in PI to prepare hybrid or composite materials is also an approach employed by researchers to enhance polymer properties, thus offering new functions to composite materials [10,11]. However, there are still practical problems with PI application, such as electrostatic charge accumulation and poor heat dissipation.…”