Synthesis and properties of fluorescent light‐emitting polyamide hybrids with reactive nanosilica by epoxide functionalization

Abstract

A series of poly(carbazole-quinoxaline-amide)s (PCQAs) containing phenyl and long alkyl chain as pendants was synthesized from polycondensation between a new diamine with a synthesized and several commercial dicarboxylic acids using Yamazaki's method. PCQAs had inherent viscosities and weight average molecular weights (M w ) in the range of 0.48-0.62 dL g 21 and 51,600-58,500 g mol 21 , respectively. These luminescent polymers are readily soluble in a variety of organic solvents and formed low-colored and tough thin films. In this study, silane modified SiO 2 (mSiO 2 ) nanoparticles were prepared, characterized and used with PCQAs in preparation of nanocomposites via solution blending method. The interfacial interaction strength between mSiO 2 and the polymer-matrix enhanced thermal stability (T 10% , from 463 C to 500 C) and mechanical strength (from 100 MPa to 150 MPa) for composite containing 30 wt % mSiO 2 in comparison with the pure polyamide. These materials showed good ability for extractionelimination of metal ions such as Cr 61 , Cr 31 , Co 21 , Zn 21 , Pb 21 , Cd 21 , and Hg 21 from aqueous solutions either individually or in the mixture at various pH.

Polyamidation of new diamine monomers containing bulky pendant groups based on imidazole ring and fabrication of polyamide/modified‐SiO2composite: Properties and applications

“…Table 5 indicated the obtained data of adsorption of Co 2+ and Hg 2+ by adsorbents. The amide and imidazole NH group and also ether linkage in the backbone of polymers act as a desirable platform for the absorption proceeding 8 . These functional groups make the complex with the metal ions.…”

“…The amide and imidazole NH group and also ether linkage in the backbone of polymers act as a desirable platform for the absorption proceeding. 8 These functional groups make the complex with the metal ions. Due to Table 5, the order for the adsorption was: Co 2+ > Hg 2+ .…”

“…The placement of different organic groups on SiO 2 NPs' surface through the modification of SiO 2 NPs by silane coupling agents is one of the methods to resolve this problem. 7,8 The aromatic or semi-aliphatic polyamides (PAs) can be employed as polymer matrices. [9][10][11] The polyamide/silica nanocomposite, the PA matrix's multiple properties, and the SiO 2 NPs combined, and this caused expanding nanocomposite systems with better function.…”

Influence of morphology on the dynamic and quasi‐static energy absorption of polylactic acid‐based lattice structures

“…Alternatively, polymer blending can be considered to produce a material with intermediate properties or enhancing specific properties. Improvements in EA are related to the formation of different morphologies, of which the most common morphologies are dispersed droplet and co‐continuous structures 16–19 as well as interpenetrating networks 20 . An appropriate morphology in the blend can lead to improved properties but is a delicate balance between rheology, composition, processing conditions, and interfacial interaction 21 …”

Design and fabrication of photoactive imidazole-based poly(ether-imide)s and a polyimide/HBP-modified SiO2 composite: toward high heat-resistance, antimicrobial activity and removal of heavy metal ions

“…Modifying nanoparticles (NPs) by silane coupling agents is a beneficial procedure for controlling the good dispersion of NPs in the polymeric phase. 7,8 Hyperbranched polymers (HBPs) are highly branched macromolecules with a 3D spherical structure and abundant agglomeration of active terminal groups that can link nano-surfaces ( i.e. GO, SiO 2 , Al 2 O 3 ).…”