Hollow polymer nanocapsules with a ferrocenyl copolymer shell

Dhara, Moumita; Rudra, Somdatta; Mukherjee, Nilanjan; Jana, Tushar

doi:10.1039/d1py00590a

Cited by 11 publications

(6 citation statements)

References 56 publications

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“…In order to grow polymer chains covalently on the surface of any nanomaterials, “ grafting to ” and “ grafting from ” are the two major approaches mostly utilized in the literature. Researchers have utilized both these strategies to graft polymer chains on the GO surface via atom transfer radical polymerization (ATRP) and reversible addition fragmentation chain-transfer (RAFT) polymerization techniques. − The grafting from method allows the effective in situ generation of the nanomaterial surface modified with polymer chains, and hence the surface-initiated RAFT (SI-RAFT) technique has been adapted by us in this work for the surface functionalization of GO, where we can control the growth of the polymer chains and structure at the molecular level.…”

Section: Introductionmentioning

confidence: 99%

Polymer-Grafted Graphene Oxide/Polybenzimidazole Nanocomposites for Efficient Proton-Conducting Membranes

Das

Mukherjee

Jana

2023

ACS Appl. Nano Mater.

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In this study, we have functionalized graphene oxide (GO) by growing polymer chains on its surface and then utilized the polymer-g-GO as a nanofiller with oxypolybenzimidazole (OPBI) to make a highly efficient nanocomposite-based proton exchange membrane (PEM). Three different monomers, namely, acrylamide (AAM), 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS), and 3-sulfopropyl acrylate potassium salt (SPAK), were polymerized on the activated GO surface via surface-initiated reversible addition fragmentation chain-transfer polymerization to obtain three different types of polymer-g-GO, namely, pAAM-g-GO, pAMPS-g-GO, and pSPAK-g-GO. Furthermore, the chain length of grafted polymers in each case was altered in order to study the effects of the grafted polymer structure and chain length on the properties of nanocomposite PEMs. The exfoliation of GO nanosheets after polymer grafting was confirmed by studying the surface morphology using various microscopic techniques. Gel permeation chromatography and thermogravimetric analysis helped in measuring the chain length of grafted polymers and grafting density on the GO surface. Furthermore, we have impregnated polymer-g-GO as nanofillers by varying loading wt % into the OPBI to fabricate a mixed matrix membrane which upon doping with phosphoric acid (PA) converted into a mixed matrix PEM. The prepared nanocomposite PEM displayed exceptionally good thermal stability, significantly improved tensile properties, improved PA loading followed by superior proton conductivity, and remarkable PA retention when exposed to saturated water vapor. When the 2.5 wt % pSPAK-g-GO (where the pSPAK chain length is 19.6 kDa) mixed with OPBI, the resulting PEM showed a remarkably high proton conductivity value of 0.327 S cm −1 at 160 °C, a significant 5-fold increment compared to the pristine OPBI membrane (0.067 S cm −1 at 160 °C). To the best of our knowledge, this will be the first report on utilization of polymer-g-GO in polybenzimidazole membranes for hightemperature PEM application.

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Section: Introductionmentioning

confidence: 99%

Polymer-Grafted Graphene Oxide/Polybenzimidazole Nanocomposites for Efficient Proton-Conducting Membranes

Das

Mukherjee

Jana

2023

ACS Appl. Nano Mater.

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“…It has also been noted that with the increase in monomer feed ratio, the polymer chain grafting density (σ) also increases gradually from P1 to P5 and P6 to P10 (Table ). It may be noted that σ of SiNP-CPDB (1.507 CPDB/nm 2 ) is much higher (∼3 to 5 times) compared to that of FPB- g -SiNP, which in turn suggests that not all the CTA on the particle surface is actively participating in the growth of FPB chains, which is quite reasonable owing to the steric crowding factor as per the reported literature . Together with this, the radius of gyration ( R g ) of the grafted chains (which is R g = 0.5 N 0.5 nm) and the average distance between the neighboring polymer chains ( D ) (which is equal to σ –1/2 ) are calculated for all the polymers, and the ratio of D to R g is enlisted in Table .…”

Section: Results and Discussionmentioning

confidence: 63%

“…It may be noted that σ of SiNP-CPDB (1.507 CPDB/nm 2 ) is much higher (∼3 to 5 times) compared to that of FPB-g-SiNP, which in turn suggests that not all the CTA on the particle surface is actively participating in the growth of FPB chains, which is quite reasonable owing to the steric crowding factor as per the reported literature. 51 Together with this, the radius of gyration (R g ) of the grafted chains (which is R g = 0.5N 0.5 nm) and the average distance between the neighboring polymer chains (D) (which is equal to σ −1/2 ) are calculated for all the polymers, and the ratio of D to R g is enlisted in Table 1. It has been concluded from the ratio of D to R g which is less than 2 (D/R g < 2) in all the cases that pPFS and pPFPA show a brush-type morphology on the particle surface, and hence, we can call these particles as FPB-g-SiNPs.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…In our group, we have been working on surface modification of silica nanoparticles (SiNPs) with desired functionality by employing surface-initiated RAFT polymerization (SI-RAFT) technique which have been utilized either to study protein binding efficiency or as nanofillers in HTPEM fuel cells or to create hollow polymeric nanocapsules. − Silica particles have gained wide attention in the past as well as in the recent times because they show interesting advantages like biocompatibility, low toxicity, and a readily functionalizable surface when compared with heavy metals and other types of metallic/semiconducting surfaces . Controlled radical polymerization has been utilized often for the functionalization of SiNPs in order to obtain well-defined nanocomposites which can be grown with desired thickness and composition.…”

Section: Introductionmentioning

confidence: 99%

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Fluorinated Polymer Brush-Grafted Silica Nanoparticles: Robust and Durable Self-Cleaning Coating Materials

Rudra,

Dhara,

Chakraborty

et al. 2023

ACS Appl. Polym. Mater.

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Development of highly hydrophobic surfaces having excellent self-cleaning abilities has found diverse applications in the recent years in several fields like architecture, textiles, electronics, etc. In this work, we have demonstrated a simple and easy procedure to construct a stable, self-cleaning, highly hydrophobic composite coating material. Two different types of fluorinated polymers, namely, poly(pentafluorostyrene) (pPFS) and poly(pentafluorophenyl acrylate) (pPFPA), were grown on the silica nanoparticle (SiNP) surface for the preparation of FPB-g-SiNP. Further, FPB-g-SiNPs were used as nanofillers to constitute a coating with multiscale roughness on the bare polystyrene (PS) surface, and the resulting composite coating (FPB-g-SiNP/PS) yielded a very highly hydrophobic surface with contact angle values as high as ∼143°. The presence of fluoropolymer chains in the composite coating material imparts excellent chemical durability, mechanical stability, and robustness to it. The composite coating material is also in close proximity of hydrophobic (fluorinated chains) and hydrophilic (free hydroxyl groups) regions on FPBg-SiNP that resulted in a heterogeneous surface which helped in achieving strong water repellence along with reasonable wettability, leading to self-cleaning ability similar to a superhydrophobic surface. The highly hydrophobic characteristic of the coating material can be tuned by changing the weight % of FPB-g-SiNP added to the bare polystyrene. The uniqueness of our current work is that we have readily achieved the highly hydrophobic characteristic of a robust and durable coating that has high potential to be a superhydrophobic or slippery liquid-infused porous surface.

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“…In recent years, hollow polymer nanocapsules (HPN) comprising a robust shell with hollow pores and unique properties, namely, large surface area, low density, and high loading capacity, have been used for numerous applications, including micro/nanoreactors, catalysts, energy storage material, and material for environmental remediation [35]. Surfaceinitiated reversible addition fragmentation chain-transfer (RAFT) polymerization has been employed to prepare polymeric nanocapsules using silica nanoparticles as sacrificial templates and a polymeric shell of poly[poly(tert-butylmethacrylate)-co-poly(2,3dimethylmaleicimidopropylmethacrylate)-b-poly(2-hydroxypropyl methacrylamide)], where the dimethylmaleic amidopropyl methacrylate acts as the photo-crosslinker for stabilizing the nanocapsules [36].…”

Section: Hollow Polymer Nanocapsulesmentioning

confidence: 99%

Polymer Coated Functional Catalysts for Industrial Applications

Arya

Thapliyal

Pandit³

et al. 2023

Polymers

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Surface engineering of conventional catalysts using polymeric coating has been extensively explored for producing hybrid catalytic material with enhanced activity, high mechanical and thermal stability, enhanced productivity, and selectivity of the desired product. The present review discusses in detail the state-of-the-art knowledge on surface modification of catalysts, namely photocatalysts, electrocatalysts, catalysts for photoelectrochemical reactions, and catalysts for other types of reactions, such as hydrodesulfurization, carbon dioxide cycloaddition, and noble metal-catalyzed oxidation/reduction reactions. The various techniques employed for the polymer coating of catalysts are discussed and the role of polymers in enhancing the catalytic activity is critically analyzed. The review further discusses the applications of biodegradable and biocompatible natural polysaccharide-based polymers, namely, chitosan and polydopamine as prospective coating material.

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Hollow polymer nanocapsules with a ferrocenyl copolymer shell

Abstract: Hollow polymer nanocapsules (HPN) consist of ferrocenyl shell have been developed by crosslinking the polymer chains grafted over silica nanoparticles (SiNP) which were synthesized via one pot grafting from surface...

Cited by 11 publications

References 56 publications

Polymer-Grafted Graphene Oxide/Polybenzimidazole Nanocomposites for Efficient Proton-Conducting Membranes

Polymer-Grafted Graphene Oxide/Polybenzimidazole Nanocomposites for Efficient Proton-Conducting Membranes

Fluorinated Polymer Brush-Grafted Silica Nanoparticles: Robust and Durable Self-Cleaning Coating Materials

Polymer Coated Functional Catalysts for Industrial Applications

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