Chemical Sensors Based on New Polyamides Biobased on (Z) Octadec‐9‐Enedioic Acid and β‐Cyclodextrin

Abstract

International audienceThe synthesis of new biobased polyamides from different β-cyclodextrin monomers and the (Z) octadec-9-enedioic acid is investigated. The aim of this study is to design different sensors, having different sensibilities and selectivities to a set of various volatile organic compounds (VOC) relevant in the early detection of lung cancer. The sensors are obtained from the synthesized polyamides, using multiwalled carbon nanotubes as conductive nanofillers and a layer by layer process. The conductive polymer nanocomposites (CPC) designed from the heptakis-6-amino β-cyclodextrin and 6A,6D diamino β-cyclodextrin have a high affinity for polar protic solvents, while the CPC having a matrix based on 6A,6D diamino 2A-G,3A-G,6B,6C,6E,6F,6G nonadeca-O-benzyl-β-cyclodextrin develops hydrophobic interactions with nonpolar solvents. Due to a higher accessibility of cyclodextrin, the chemoresistive response of the hydrophilic linear polyamide CPC is larger than one of the hydrophilic branched polyamide CPC. As required, the VOC diffusion/desorption phenomenon is reversible for all the sensors

High‐Performance and Biobased Polyamide/Functionalized Graphene Oxide Nanocomposites through In Situ Polymerization for Engineering Applications

“…Biobased PAs are of great interest academically and industrially due to improving the carbon footprint of plastic products and positively impacting their life‐cycle evaluation. [ 4–6 ] On the other hand, nanofillers have been used frequently for improving the mechanical, physical, and wear properties of biobased PAs and consequently obtain high‐performance nanocomposites for engineering applications. [ 7–9 ] A small loading of nanofiller into a polymer matrix could result in nanocomposites with excellent stiffness, boosted mechanical strength, enhanced gas barrier property, and higher thermal stability.…”

Programmed Synthesis of Hepta‐Differentiated β‐Cyclodextrin: 1 out of 117655 Arrangements

“…[13] While we established as et of tools to add two or three different functions on CDs,others also defined methods to do so based on this reaction [20,21] or using other strategies that have been parallelly uncovered. [22][23][24][25] As in the early days of CD chemistry,t hese processes fueled ar ebirth of the CDbased enzyme mimicry, [26,27] but also CD-metal complex association [28][29][30][31] or metal encapsulation, [32] supramolecular self-assemblies [33] or variation of hostguest complexes, [34,35] applications in the polymer sciences [36][37][38] luminescence, [39] as sensors, [40] for bioimaging. [41] Given the progress made possible by the addition of one or two functions on the CD, we logically wondered whether we could add more,s till in ar egioselective manner.W en ext combined the different strategies and obtained a-CDs with 4, [18] 5and even 6 [19] different functions on the primary rim.…”

Programmed Synthesis of Hepta‐Differentiated β‐Cyclodextrin: 1 out of 117655 Arrangements

“…While we established a set of tools to add two or three different functions on CDs, others also defined methods to do so based on this reaction [20, 21] or using other strategies that have been parallelly uncovered [22–25] . As in the early days of CD chemistry, these processes fueled a rebirth of the CD‐based enzyme mimicry, [26, 27] but also CD‐metal complex association [28–31] or metal encapsulation, [32] supramolecular self‐assemblies [33] or variation of host‐guest complexes, [34, 35] applications in the polymer sciences [36–38] luminescence, [39] as sensors, [40] for bioimaging [41] . Given the progress made possible by the addition of one or two functions on the CD, we logically wondered whether we could add more, still in a regioselective manner.…”