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Polymers
Special Issues
Silicone-Based Polymers: From Fabrication to Application
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Silicone-Based Polymers: From Fabrication to Application

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

Deadline for manuscript submissions: closed (15 January 2024) | Viewed by 3214

Special Issue Editors

Prof. Dr. Valery Alexandrovich Vasnev

E-Mail Website
Guest Editor
A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, Moscow 119991, Russia
Interests: functional siloxane coating; polycarboranesiloxanes; polycondensation; copolymers; polymer composite; biomedical application
Dr. Anton A. Anisimov

E-Mail Website
Guest Editor
A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, Moscow 119991, Russia
Interests: siloxanes; dendrimers; stereoregular organocyclosilsesquioxanes; metallasiloxanes; hydrosilylation; hydrothiolation
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The chemistry of silicones continues to rapidly develop, with an average annual increase in production volumes of 5–7% worldwide. This is due to the demand for a variety of silicones in almost all practical sectors, from space, aircraft аnd car manufacturing to construction, membrane technology, elastomers, various functional coatings, organoelement polysiloxanes, adhesives and sealants, cosmetics and medicine and household chemicals.

Along with increased production, the question of reducing the technogenic load on the environment in the form of aggressive waste and high energy consumption is becoming increasingly clear. The task of fundamental science in this important area is very specific and simple—the transition to chlorine-free technologies throughout the entire chain of silicone production, from the synthesis of monomers to the production of finished products, including completely new discoveries that have no analogues in the previous technological cycle.

Prof. Dr. Valery Alexandrovich Vasnev
Dr. Anton A. Anisimov
Guest Editors

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 submissions that pass pre-check are 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 semimonthly 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 2700 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

  • polysiloxanes
  • chorine-free siloxane synthesis
  • elastomers
  • functional coatings
  • membranes
  • adhesives and sealants
  • cosmetics and medicine
  • household chemicals
  • building
  • machine engineering

Published Papers (2 papers)

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Research

16 pages, 4257 KiB  
Article
Liquid Silicone Rubber Headlamp Lens Injection Molding Process Optimization Based on Tie Bar Elongation and NSGA III
by Hanjui Chang, Shuzhou Lu, Yue Sun and Rui Wang
Polymers 2023, 15(21), 4278; https://doi.org/10.3390/polym15214278 - 31 Oct 2023
Viewed by 1142
Abstract
This study aimed to improve the injection molding quality of LSR material lenses by optimizing the process parameters. To achieve this goal, we employed the population-based optimization algorithm NSGA-III, which can simultaneously optimize multiple objective functions and identify an equilibrium point among them, [...] Read more.
This study aimed to improve the injection molding quality of LSR material lenses by optimizing the process parameters. To achieve this goal, we employed the population-based optimization algorithm NSGA-III, which can simultaneously optimize multiple objective functions and identify an equilibrium point among them, thereby reducing the time required to find the optimal process parameters. We utilized analysis software to simulate the injection molding process of LSR material lenses, with a specific focus on examining the relationship between tie bar elongation and the optimized process parameters. During the study, we intentionally varied key process parameters, including the melt temperature, holding pressure, and holding time, to analyze their impact on the residual stress of the final product. In order to investigate the intricate relationship between the tie bar yield, injection molding process parameters, and lens residual stress, we installed strain sensors on the tie bar to continuously monitor changes in clamping force throughout the injection molding process. The experimental results showed that both the tie bar force and mold cavity pressure exerted significant influence on residual stresses. By applying the NSGA-III algorithm for optimization, we successfully determined the optimal process parameters, which included a melt temperature of 34.92 °C, a holding pressure of 33.97 MPa, and a holding time of 9.96 s. In comparison to the initially recommended process parameters during the design phase, the optimized parameters led to reductions of 12.98% in clamping force and 47.14% in residual stress. Furthermore, the average transmittance of the actual product remained within the range of 95–98%. In summary, this approach not only enables the prediction of the lens’s residual stress trends based on the tie bar elongation, but also leads to a substantial enhancement of lens quality, characterized by reduced residual stress and improved transmittance through the optimization of process parameters. This methodology can serve as a valuable guide for optimizing real-world injection molding processes. Full article
(This article belongs to the Special Issue Silicone-Based Polymers: From Fabrication to Application)
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10 pages, 2268 KiB  
Article
The Effect of Porosity on the Thermal Conductivity of Highly Thermally Conductive Adhesives for Advanced Semiconductor Packages
by Hyun-Seok Choi, Jeong-Hyun Park and Jong-Hee Lee
Polymers 2023, 15(14), 3083; https://doi.org/10.3390/polym15143083 - 18 Jul 2023
Cited by 1 | Viewed by 1320
Abstract
This study suggests promising candidates as highly thermally conductive adhesives for advanced semiconductor packaging processes such as flip chip ball grid array (fcBGA), flip chip chip scale package (fcCSP), and package on package (PoP). To achieve an extremely high thermal conductivity (TC) of [...] Read more.
This study suggests promising candidates as highly thermally conductive adhesives for advanced semiconductor packaging processes such as flip chip ball grid array (fcBGA), flip chip chip scale package (fcCSP), and package on package (PoP). To achieve an extremely high thermal conductivity (TC) of thermally conductive adhesives of around 10 Wm−1K−1, several technical methods have been tried. However, there are few ways to achieve such a high TC value except by using spherical aluminum nitride (AlN) and 99.99% purified aluminum oxide (Al2O3) fillers. Herein, by adapting highly sophisticated blending and dispersion techniques with spherical AlN fillers, the highest TC of 9.83 Wm−1K−1 was achieved. However, there were big differences between theoretically calculated TCs that were based on the conventional Bruggeman asymmetric model and experimentally measured TCs due to the presence of voids or pores in the composites. To narrow the gaps between these two TC values, this study also suggests a new experimental model that contains the porosity effect on the effective TC of composites in high filler loading ranges over 80 vol%, which modifies the conventional Bruggeman asymmetric model. Full article
(This article belongs to the Special Issue Silicone-Based Polymers: From Fabrication to Application)
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