Special Issue "Porous Polymer Micro- and Nano-Structures"

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Polymer Analysis".

Deadline for manuscript submissions: 31 March 2020.

Special Issue Editor

Prof. Il Kim
E-Mail Website
Guest Editor
Department of Polymer Science and Engineering, Pusan National University, Busan, South Korea
Interests: Polymer synthesis; Polymerization catalysis; Bionanotechnology; Hyperbranched polymers; Polypeptides; Thermoplastic elastomers
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Special Issue Information

Dear Colleagues,

One of the key challenges in nanoscience and nanotechnology is the precise control of the morphology, dimensions, and functionality of nanostructures to fit distinctive application requirements. Thus far, much effort has been expended to achieve morphological control of porous organic frameworks with tunable structures and the desired distribution. For example, solution-phase-synthesized porous polymer spheres (PPSs) have attracted much research interest due to their potential utility as catalysts and in drug delivery, gas adsorption, and membrane applications. The major advantage of PPSs is the potential synthetic diversity that can be integrated into these organic polymer structures. Furthermore, the carbonization of PPSs produces carbonaceous spheres that can also be applied in electrical-related fields, such as sensors, super-capacitors, and batteries. Contributions to this Special Issue should preferably report the development of polymer-based porous polymer micro-/nano-structures and their potential applications to emerging technologies. Research articles, reviews, and communications are welcome.

Prof. Il Kim
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Polymers is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1500 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • block copolymers;
  • cross-linked polymers;
  • hollow polymers;
  • polyaromatics;
  • polymer microparticles;
  • polymer nanoparticles;
  • porous carbon;
  • porous polymer particles;
  • self-assembly.

Published Papers (2 papers)

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Research

Open AccessArticle
Smart Microneedles with Porous Polymer Coatings for pH-Responsive Drug Delivery
Polymers 2019, 11(11), 1834; https://doi.org/10.3390/polym11111834 - 07 Nov 2019
Abstract
: This work demonstrates a simple approach for coating a porous polymer layer on stainless-steel (SS) microneedles characterized by a pH-responsive formulation for self-regulated drug delivery. For many drug-delivery applications, the release of therapeutic agents in an acidic microenvironment is desirable. Acid-sensitive polymers [...] Read more.
: This work demonstrates a simple approach for coating a porous polymer layer on stainless-steel (SS) microneedles characterized by a pH-responsive formulation for self-regulated drug delivery. For many drug-delivery applications, the release of therapeutic agents in an acidic microenvironment is desirable. Acid-sensitive polymers and hydrogels were extensively explored, but easily prepared polymeric microcarriers that combine acid sensitivity and biodegradability are rare. Here, we describe a simple and robust method of coating a porous polymer layer on SS microneedles (MNs) that release a model drug (lidocaine) in a pH-responsive fashion. It was constructed by packing the model drug and a pH-sensitive component (sodium bicarbonate) into the pores of the polymer layer. When this acid-sensitive formulation was exposed to the acidic microenvironment, the consequent reaction of protons (H+) with sodium bicarbonate (NaHCO3) yielded CO2. This effect generated pressure inside the pores of the coating and ruptured the thin polymer membrane, thereby releasing the encapsulated drug. Scanning electron micrographs showed that the pH-sensitive porous polymer-coated MNs exposed to phosphate-buffered saline (PBS) at pH 7.4 were characterized by closed pores. However, MNs exposed to PBS at pH 5.5 consisted of open pores and the thin membrane burst. The in vitro studies demonstrated the pH sensitivity of the drug release from porous polymer-coated MNs. Negligible release was observed for MNs in receiving media at pH 7.4. In contrast, significant release occurred when the MNs were exposed to acidic conditions (pH 5.5). Additionally, comparable results were obtained for drug release in vitro in porcine skin and in PBS. This revealed that our developed pH-responsive porous polymer-coated MNs could potentially be used for the controlled release of drug formulations in an acidic environment. Moreover, the stimuli-responsive drug carriers will enable on-demand controlled release profiles that may enhance therapeutic effectiveness and reduce systemic toxicity. Full article
(This article belongs to the Special Issue Porous Polymer Micro- and Nano-Structures)
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Open AccessArticle
Polyimide-Based PolyHIPEs Prepared via Pickering High Internal Phase Emulsions
Polymers 2019, 11(9), 1499; https://doi.org/10.3390/polym11091499 - 13 Sep 2019
Abstract
Pyromellitic dianhydride (PMDA) and 4,4′-oxydianiline (ODA) oligoimide particles and PMDA-ODA poly(amic acid) salt (PAAS) were synthesized and used as stabilizers to prepare oil-in-water Pickering high internal phase emulsions (HIPEs). The stability of the Pickering HIPEs was investigated by dispersion stability analysis. Polyimide-based polyHIPEs [...] Read more.
Pyromellitic dianhydride (PMDA) and 4,4′-oxydianiline (ODA) oligoimide particles and PMDA-ODA poly(amic acid) salt (PAAS) were synthesized and used as stabilizers to prepare oil-in-water Pickering high internal phase emulsions (HIPEs). The stability of the Pickering HIPEs was investigated by dispersion stability analysis. Polyimide-based polyHIPEs could be prepared through freeze-drying and subsequent thermal imidization of the Pickering HIPEs. The characteristics of the polyHIPEs, including their morphology, porosity, thermal decomposition temperature, and compression modulus, were investigated. The thermal decomposition temperature (T10) of the polyHIPEs was very high (>530 °C), and their porosity was as high as 92%. The polyimide-based polyHIPEs have the potential to be used in high-temperature environments. Full article
(This article belongs to the Special Issue Porous Polymer Micro- and Nano-Structures)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

1. A fluorescent porous polymer based on sesquiosiloxane

Wang, D.; et al.

2. A two-dimensional conjugate porous polymer for energy conversion and storage

Yuan, K.; et al.

3. Preparation and application of lightweight microspheres based on polymers

Wei, X.; et al.
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