Special Issue "Polymer-SiO₂ Composites"

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

Deadline for manuscript submissions: 20 October 2021.

Special Issue Editor

Prof. Dr. Hyeon Mo Cho
E-Mail Website
Guest Editor
University College, Yonsei University, Incheon 21983, Korea
Interests: silicon chemistry; semiconductor manufacturing material

Special Issue Information

Dear Colleagues,

Silica is a common, particularly attractive material around us. Silicon and oxygen are the two most abundant elements in the Earth’s crust, and their combination, silica, has been used in a variety of fields. The bond enthalpy of Si–O is much larger than that of the C–O bond, rendering the thermal stability of silica, and its larger bond angle and longer bond length provide bond flexibility. In addition, uncondensed OH groups (silanol) on the silica surface make it easy for silica to connect with other materials, such as organic compounds, metal oxides, and metals.

Through the hybridization of silica with suitable materials, polymer/SiO2 composites can be customized in many ways to meet the needs of new cutting-edge technologies. For example, investigations on their applications in sensors, photoactive materials, filters, anodes in lithium ion batteries, drug delivery systems, catalysts, and biocompatible materials have been conducted.

This Special Issue will cover but not be limited to the following aspects of polymer/SiO2 composite chemistry and technology: Novel preparation method for polymer/SiO2 composites; Novel micro- and macrostructural analysis of polymer/SiO2 composites; Novel chemical and physical properties of polymer/SiO2 composites; Applications of polymer/SiO2 composites.

Dr. Hyeon Mo Cho
Guest Editor

Manuscript Submission Information

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Keywords

  • silica
  • SiO2
  • polymer
  • composite
  • sol-gel
  • organic-inorganic composite

Published Papers (6 papers)

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Research

Article
Thermal Stability of Nanosilica-Modified Poly(vinyl chloride)
Polymers 2021, 13(13), 2057; https://doi.org/10.3390/polym13132057 - 23 Jun 2021
Viewed by 395
Abstract
The thermal stability of PVC with 1 wt % of spherical porous nanosilica, prepared by roll milling at processing time varied from 1 to 20 min, was investigated by means of visual color changes, Congo red, and thermogravimetric tests (TGA and DTG), as [...] Read more.
The thermal stability of PVC with 1 wt % of spherical porous nanosilica, prepared by roll milling at processing time varied from 1 to 20 min, was investigated by means of visual color changes, Congo red, and thermogravimetric tests (TGA and DTG), as a function of rolling time and composition of PVC matrix. The melt flow rate (MFR) measurements were realized to identify the degradation-induced changes of processing properties. A high level of gelation of the PVC matrix for all samples was verified by DSC (differential scanning calorimetry). It was found that the addition of porous nanosilica to absorb a certain volume of HCl, produced by dehydrochlorination reaction, leads to an improvement of thermal stability, an effect observed in a form of minor color changes of the samples, lower evolution of gas hydrogen chloride, and slight changes of the MFR value. It was demonstrated that the TGA measurements are not sufficiently sensible to detect the degradation of PVC at the processing conditions, i.e., at the temperature equal to 220 °C and below this temperature. Full article
(This article belongs to the Special Issue Polymer-SiO₂ Composites)
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Article
Improvement of the Centrifugal Force in Gravity Driven Method for the Fabrication of Highly Ordered and Submillimeter-Thick Colloidal Crystal
Polymers 2021, 13(5), 692; https://doi.org/10.3390/polym13050692 - 25 Feb 2021
Viewed by 467
Abstract
In this paper, we propose a modified gravity method by introducing centrifugal force to promote the stacking of silica particles and the order of formed colloidal crystals. In this method, a monodispersed silica colloidal solution is filled into empty cells and placed onto [...] Read more.
In this paper, we propose a modified gravity method by introducing centrifugal force to promote the stacking of silica particles and the order of formed colloidal crystals. In this method, a monodispersed silica colloidal solution is filled into empty cells and placed onto rotation arms that are designed to apply an external centrifugal force to the filled silica solution. When sample fabrication is in progress, silica particles are forced toward the edges of the cells. The number of defects in the colloidal crystal decreases and the structural order increases during this process. The highest reflectivity and structural order of a sample was obtained when the external centrifugal force was 18 G. Compared to the samples prepared using the conventional stacking method, samples fabricated with centrifugal force possess higher reflectivity and structural order. The reflectivity increases from 68% to 90%, with an increase in centrifugal force from 0 to 18 G. Full article
(This article belongs to the Special Issue Polymer-SiO₂ Composites)
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Article
Fast Curable Polysiloxane-Silphenylene Hybrimer with High Transparency and Refractive Index for Optical Applications
Polymers 2021, 13(4), 515; https://doi.org/10.3390/polym13040515 - 09 Feb 2021
Viewed by 442
Abstract
In this study, a fast curable polysiloxane-silphenylene hybrimer (PSH) was synthesized by the nonhydrolytic sol–gel condensation of phenyl-vinyl-oligosiloxane (PVO) and tris(dimethylhydrosilyl)benzene (TDMSB) under a Pt catalyst to investigate its optical property and thermal stability. The combination of PVO and tripod-type TDMSB results in [...] Read more.
In this study, a fast curable polysiloxane-silphenylene hybrimer (PSH) was synthesized by the nonhydrolytic sol–gel condensation of phenyl-vinyl-oligosiloxane (PVO) and tris(dimethylhydrosilyl)benzene (TDMSB) under a Pt catalyst to investigate its optical property and thermal stability. The combination of PVO and tripod-type TDMSB results in a hybrimer with a fast curing time of 30 min. The PSH exhibited a high refractive index of 1.60, 1.59, and 1.58 at 450, 520, and 635 nm, respectively. High transmittance of 97% at 450 nm was obtained. The PSH exhibited a very high transmittance of 97% before thermal aging. The high optical transmittance of the PSH was only slightly decreased by 0.5% of the transmittance at 180 °C for 72 h after thermal aging, and high transparency was maintained almost constant even after 72 h of high-temperature treatment. Full article
(This article belongs to the Special Issue Polymer-SiO₂ Composites)
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Article
Comparison between SBR Compounds Filled with In-Situ and Ex-Situ Silanized Silica
Polymers 2021, 13(2), 281; https://doi.org/10.3390/polym13020281 - 16 Jan 2021
Cited by 1 | Viewed by 522
Abstract
The main advantages of the use of silica instead of carbon black in rubber compounds are based on the use of a silane coupling agent. The use of a coupling agent to modify the silica surface improves the compatibility between the silica and [...] Read more.
The main advantages of the use of silica instead of carbon black in rubber compounds are based on the use of a silane coupling agent. The use of a coupling agent to modify the silica surface improves the compatibility between the silica and the rubber. There are two different possibilities of modifying the silica surface by silane: ex-situ and in-situ. The present work studies the differences between these processes and how they affect the in-rubber properties of silica filled SBR compounds. Full article
(This article belongs to the Special Issue Polymer-SiO₂ Composites)
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Article
Effect of SiO2 Particles on the Relaxation Dynamics of Epoxidized Natural Rubber (ENR) in the Melt State by Time-Resolved Mechanical Spectroscopy
Polymers 2021, 13(2), 276; https://doi.org/10.3390/polym13020276 - 15 Jan 2021
Cited by 1 | Viewed by 432
Abstract
The rheological behavior of an epoxidized natural rubber (ENR) nanocomposite containing 10 wt.% of silica particles was examined by time-resolved mechanical spectroscopy (TRMS), exploiting the unique capability of this technique for monitoring the time-dependent characteristics of unstable polymer melts. The resulting storage modulus [...] Read more.
The rheological behavior of an epoxidized natural rubber (ENR) nanocomposite containing 10 wt.% of silica particles was examined by time-resolved mechanical spectroscopy (TRMS), exploiting the unique capability of this technique for monitoring the time-dependent characteristics of unstable polymer melts. The resulting storage modulus curve has revealed a progressive evolution of the elastic component of the composite, associated with slower relaxations of the ENR macromolecular chains. Two major events were identified and quantified: one is associated with the absorption of the epoxidized rubber macromolecules onto the silica surface, which imposes further restrictions on the motions of the chains within the polymer phase; the second is related to gelation and the subsequent changes in rheological behavior resulting from the simultaneous occurrence cross-linking and chain scission reactions within the ENR matrix. These were quantified using two parameters related to changes in the storage and loss modulus components. Full article
(This article belongs to the Special Issue Polymer-SiO₂ Composites)
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Article
The Investigation of the Silica-Reinforced Rubber Polymers with the Methoxy Type Silane Coupling Agents
Polymers 2020, 12(12), 3058; https://doi.org/10.3390/polym12123058 - 20 Dec 2020
Cited by 1 | Viewed by 781
Abstract
The methoxy-type silane coupling agents were synthesized via the modification of the hydrolyzable group and characterized to investigate the change in properties of silica/rubber composites based on the different silane coupling agent structures and the masterbatch fabrication methods. The prepared methoxy-type silane coupling [...] Read more.
The methoxy-type silane coupling agents were synthesized via the modification of the hydrolyzable group and characterized to investigate the change in properties of silica/rubber composites based on the different silane coupling agent structures and the masterbatch fabrication methods. The prepared methoxy-type silane coupling agents exhibited higher reactivity towards hydrolysis compared to the conventional ethoxy-type one which led to the superior silanization to the silica filler surface modified for the reinforcement of styrene-butadiene rubber. The silica/rubber composites based on these methoxy-type silane coupling agents had the characteristics of more developed vulcanization and mechanical properties when fabricated as masterbatch products for tread materials of automobile tire surfaces. In particular, the dimethoxy-type silane coupling agent showed more enhanced rubber composite properties than the trimethoxy-type one, and the environmentally friendly wet masterbatch fabrication process was successfully optimized. The reactivity of the synthesized silane coupling agents toward hydrolysis was investigated by FITR spectroscopic analysis, and the mechanical properties of the prepared silica-reinforced rubber polymers were characterized using a moving die rheometer and a universal testing machine. Full article
(This article belongs to the Special Issue Polymer-SiO₂ Composites)
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