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Keywords = poly(imide-siloxane)

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13 pages, 3254 KB  
Article
Preparation of a Crosslinked Poly(imide-siloxane) for Application to Transistor Insulation
by Hyeong-Joo Park, Ju-Young Choi, Seung-Won Jin, Seung-Hyun Lee, Yun-Je Choi, Dam-Bi Kim and Chan-Moon Chung
Polymers 2022, 14(24), 5392; https://doi.org/10.3390/polym14245392 - 9 Dec 2022
Cited by 1 | Viewed by 2397
Abstract
Insulated gate bipolar transistor (IGBT) is an important power device for the conversion, control, and transmission of semiconductor power, and is used in various industrial fields. The IGBT module currently uses silicone gel as an insulating layer. Since higher power density and more [...] Read more.
Insulated gate bipolar transistor (IGBT) is an important power device for the conversion, control, and transmission of semiconductor power, and is used in various industrial fields. The IGBT module currently uses silicone gel as an insulating layer. Since higher power density and more severe temperature applications have become the trend according to the development of electronic device industry, insulating materials with improved heat resistance and insulation performances should be developed. In this study, we intended to synthesize a new insulating material with enhanced thermal stability and reduced thermal conductivity. Poly(imide-siloxane) (PIS) was prepared and crosslinked through a hydrosilylation reaction to obtain a semi-solid Crosslinked PIS. Thermal decomposition temperature, thermal conductivity, optical transparency, dielectric constant, and rheological property of the Crosslinked PIS were investigated and compared to those of a commercial silicone gel. The Crosslinked PIS showed high thermal stability and low thermal conductivity, along with other desirable properties, and so could be useful as an IGBT-insulating material. Full article
(This article belongs to the Special Issue Functional Polymeric Materials for Electrical Insulation Application)
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22 pages, 4452 KB  
Article
All-Polymer Piezo-Composites for Scalable Energy Harvesting and Sensing Devices
by George-Theodor Stiubianu, Adrian Bele, Alexandra Bargan, Violeta Otilia Potolinca, Mihai Asandulesa, Codrin Tugui, Vasile Tiron, Corneliu Hamciuc, Mihaela Dascalu and Maria Cazacu
Molecules 2022, 27(23), 8524; https://doi.org/10.3390/molecules27238524 - 3 Dec 2022
Cited by 3 | Viewed by 2242
Abstract
Silicone elastomer composites with piezoelectric properties, conferred by incorporated polyimide copolymers, with pressure sensors similar to human skin and kinetic energy harvester capabilities, were developed as thin film (<100 micron thick) layered architecture. They are based on polymer materials which can be produced [...] Read more.
Silicone elastomer composites with piezoelectric properties, conferred by incorporated polyimide copolymers, with pressure sensors similar to human skin and kinetic energy harvester capabilities, were developed as thin film (<100 micron thick) layered architecture. They are based on polymer materials which can be produced in industrial amounts and are scalable for large areas (m2). The piezoelectric properties of the tested materials were determined using a dynamic mode of piezoelectric force microscopy. These composite materials bring together polydimethylsiloxane polymers with customized poly(siloxane-imide) copolymers (2–20 wt% relative to siloxanes), with siloxane segments inserted into the structure to ensure the compatibility of the components. The morphology of the materials as free-standing films was studied by SEM and AFM, revealing separated phases for higher polyimide concentration (10, 20 wt%). The composites show dielectric behavior with a low loss (<10−1) and a relative permittivity superior (3–4) to pure siloxane within a 0.1–106 Hz range. The composite in the form of a thin film can generate up to 750 mV under contact with a 30 g steel ball dropped from 10 cm high. This capability to convert a pressure signal into a direct current for the tested device has potential for applications in self-powered sensors and kinetic energy-harvesting applications. Furthermore, the materials preserve the known electromechanical properties of pure polysiloxane, with lateral strain actuation values of up to 6.2% at 28.9 V/μm. Full article
(This article belongs to the Special Issue New Trends in Polymer-Based Materials)
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17 pages, 1906 KB  
Article
Architectural Sustainability and Efficiency of Enhanced Waterproof Coating from Utilization of Waterborne Poly (Siloxane-Imide-Urethane) Copolymers on Roof Surfaces
by Yao-Tang Hsu, Wen-Hsin Wang and Wei-Hsi Hung
Sustainability 2020, 12(11), 4411; https://doi.org/10.3390/su12114411 - 28 May 2020
Cited by 9 | Viewed by 4145
Abstract
According to Taiwan’s Ministry of the Interior, from 2017 to 2019, more than 12% of house-purchase disputes were due to water leakage caused by frequent tropical rains, which have long troubled engineers. The thermal stability resistance, water resistance, and ultraviolet resistance of existing [...] Read more.
According to Taiwan’s Ministry of the Interior, from 2017 to 2019, more than 12% of house-purchase disputes were due to water leakage caused by frequent tropical rains, which have long troubled engineers. The thermal stability resistance, water resistance, and ultraviolet resistance of existing polyurethane formulations have been limited by environmental aging. Thus, the lifespan of commercial PU-coated resins (typical PU) for the waterproofing of roof surfaces is merely two to three years. Accordingly, this study proposed the introduction of siloxane and imide groups to produce waterborne poly(urethane-siloxane-imide) (Si-imide-WPU) copolymers to improve the resistance of environmental aging in typical PU. The waterproof coating resin made of Si-imide-WPU copolymers was environmentally friendly, safe to use, and free of organic solvents. The results showed that the optimal Si-imide-WPU-2 sample in the study made improvements on the defects of polyurethane (PU) including its thermal properties, mechanical properties, environmental resistance, and lifespan which could be extended up to 5.4 years. Consequently, the studied Si-imide-WPU copolymers could reduce material waste while enhancing the sustainability and efficiency of the architecture. Full article
(This article belongs to the Special Issue Next Energy Efficiency Solutions for Sustainable Buildings)
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11 pages, 3094 KB  
Article
Preparation and Properties of Poly(imide-siloxane) Copolymer Composite Films with Micro-Al2O3 Particles
by Ju-Young Choi, Kyeong-Nam Nam, Seung-Won Jin, Dong-Min Kim, In-Ho Song, Hyeong-Joo Park, Sungjin Park and Chan-Moon Chung
Appl. Sci. 2019, 9(3), 548; https://doi.org/10.3390/app9030548 - 6 Feb 2019
Cited by 10 | Viewed by 5742
Abstract
In the current study, poly(imide-siloxane) copolymers (PIs) with different siloxane contents were synthesized and used as a matrix material for PI/Al2O3 composites. The PIs were characterized via their molecular weight, film quality, and thermal stability. Among the PI films, free-standing [...] Read more.
In the current study, poly(imide-siloxane) copolymers (PIs) with different siloxane contents were synthesized and used as a matrix material for PI/Al2O3 composites. The PIs were characterized via their molecular weight, film quality, and thermal stability. Among the PI films, free-standing and flexible PI films were selected and used to prepare PI/Al2O3 composite films, with different Al2O3 loadings. The thermal conductivity, thermal stability, mechanical property, film flexibility, and morphology of the PI/Al2O3 composite films were investigated for their application as heat-dissipating material. Full article
(This article belongs to the Special Issue Advances in Polyimide Films: Preparation, Properties and Applications)
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13 pages, 3844 KB  
Article
Poly(imide-co-siloxane) as a Thermo-Stable Binder for a Thin Layer Cathode of Thermal Batteries
by Ilwhan Oh, Jaeyoung Cho, Kwansu Kim, Jaehwan Ko, Haewon Cheong, Young Soo Yoon and Hyun Min Jung
Energies 2018, 11(11), 3154; https://doi.org/10.3390/en11113154 - 14 Nov 2018
Cited by 16 | Viewed by 5035
Abstract
The polymer binder, poly(imide-co-siloxane) (PIS), was synthesized and applied to form a thin cathode layer of composites for a thermal battery that has an unusually high operating temperature of 450 °C. The PIS was prepared through cross-linking of the polyimide with [...] Read more.
The polymer binder, poly(imide-co-siloxane) (PIS), was synthesized and applied to form a thin cathode layer of composites for a thermal battery that has an unusually high operating temperature of 450 °C. The PIS was prepared through cross-linking of the polyimide with polysiloxane. The morphology of FeS2/PIS composites showed that FeS2 particles was coated with the PIS cross-linked gel. The FeS2/PIS composites enabled to fabricate mechanically stable thin cathode layer that was 10–20% of the thickness of a conventional pellet-type cathode. The FeS2/PIS composites were stable up to 400 °C and maintained their morphology at this temperature. PIS coating layers decomposed at 450 °C, and a new residue was generated, which was observed by transmission electron microscopy, and the compositional change was analyzed. The FeS2/PIS composites showed enhanced thermal stability over that of FeS2 in thermogravimetric analysis. The thermal battery with the PIS polymer binder showed a 20% discharge capacity increase when compared to a conventional pellet-type cathode. Full article
(This article belongs to the Section D: Energy Storage and Application)
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