Synthesis and evaluation of some derivatives of polysiloxanes

El-Sukkary, Mohamed M.; Ismail, Dina A.; Rayes, S. M. El; Saad, Mohammed A.

doi:10.1016/j.ejpe.2014.09.002

Cited by 5 publications

(5 citation statements)

References 24 publications

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“…Under of an alternating magnetic field, iron is observed to heat as a result of losses occurring as a result of the internal rotation of the magnetization and the rotation of the particles in a viscous medium. Uniform is necessary to ensure an even heat distribution within the polymer matrix during the curing procedure [ 24 ]. The heat generated from samples was evaluated by exposing iron in PDMS to an alternating current (AC) magnetic field for certain time.…”

Section: Resultsmentioning

confidence: 99%

Controlled Preparation of Thermally Stable Fe-Poly(dimethylsiloxane) Composite by Magnetic Induction Heating

et al. 2018

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Abstract:The most challenging task in the preparation of poly(dimethylsiloxane) composites is to control the curing time as well as to enhance their thermal and swelling behavior. Curing rate can be modified and controlled by a range of iron powder contents to achieve a desired working time, where iron is used as self-heating particles. Iron under alternative current magnetic field (ACMF) is able to generate thermal energy, providing a benefit in accelerating the curing of composites. Three types of iron-Poly(dimethylsiloxane) (Fe-PDMS) composites were prepared under ACMF with iron content 5, 10, and 15 wt %. The curing process was investigated by FTIR, while the morphology and the thermal stability were examined by SEM, DMA, and TGA. The heating's profile was studied as functions of iron content and induction time. It was found that the time required to complete curing was reduced and the curing temperature was controlled by varying the iron content and induction time. In addition, the thermal stability and the swelling behavior of the prepared composites were enhanced in comparison with the conventional PDMS and thus offer a promising route to obtain thermally stable composites.

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Section: Resultsmentioning

confidence: 99%

Controlled Preparation of Thermally Stable Fe-Poly(dimethylsiloxane) Composite by Magnetic Induction Heating

et al. 2018

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“…22−24 In the literature, it was already shown that dextran hardly decrease the surface tension of water (less than 1 mN/m for concentrated solution of dextran of 50g/ L), 25 whereas glucose functionalized polymers act as efficient dispersants (for instance, glycopolysiloxane solutions decrease the surface tension of water down to 35 mN/m). 26 Moreover, we cannot exclude that cross-linking by IPDI would be more effective on the glycopolymer than on polysaccharide, thus creating a chemical barrier against miglyol release.…”

Section: ■ Results and Discussionmentioning

confidence: 98%

“…In contrast, polysaccharide-coated oily particles only stabilized in size after 5–10 min. This contrasting behavior may be attributed to the marked amphiphilic character of the glycopolymer, whose preferred adsorption at the surface of the oily droplets would generate a compact polymer layer (hardly swollen) physically limiting miglyol diffusion by Ostwald ripening. − In the literature, it was already shown that dextran hardly decrease the surface tension of water (less than 1 mN/m for concentrated solution of dextran of 50g/L), whereas glucose functionalized polymers act as efficient dispersants (for instance, glycopolysiloxane solutions decrease the surface tension of water down to 35 mN/m) . Moreover, we cannot exclude that cross-linking by IPDI would be more effective on the glycopolymer than on polysaccharide, thus creating a chemical barrier against miglyol release.…”

Section: Results and Discussionmentioning

confidence: 99%

Functional Hybrid Glyconanocapsules by a One-Pot Nanoprecipitation Process

et al. 2020

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Herein, we report on one-pot fabrication of oil-filled nanocapsules wrapped with both RAFT-made glycopolymers and neutral polysaccharides (dextran and pullulan). We have made use of the nanoprecipitation technique, relying on coprecipitation of both oil and polymers in conditions thoroughly established from phase diagrams' interpretation. Mixed mono-or multi-layered nanocapsules were obtained through simultaneous or sequential nanoprecipitation, respectively. Incorporation of synthetic glycopolymer chains allows for precisely tailoring the dimensions of the nanocapsules (size and membrane thickness of the polymeric shell), whereas the insertion of polysaccharides enables to tune the (bio)degradability of the nanocapsules. Shell-functionalized and/or core-loaded capsules could also be achieved in a similar one pot process, by introducing a drug and/or biotin in the organic and aqueous phase, respectively. We finally report magnet-sensitive capsules.

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“…The crosslinking process alters the characteristic of the pre-polymer from viscous to elastic. The curing process may be accelerated by increasing the temperature [ 20 ]. After the completion of the crosslinking process, the PDMS composite exhibits a rubbery appearance.…”

Section: Resultsmentioning

confidence: 99%

The Influence of Self-Heating Iron on the Thermal, Mechanical, and Swelling Properties of PDMS Composites for Organic Solvents Removal

Darwish

Al-Harbi²

2021

Polymers

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Volatile organic compounds pollute the environment and pose a serious threat to human health due to their toxicity, mutagenicity, and carcinogenicity. In this context, it is highly desirable to fabricate high-performance poly (dimethylsiloxane) (PDMS) composites to remove organic solvents from the environment using a simple technique. Therefore, in the present study, Fe-PDMS composites were fabricated using a technique based on magnetic induction heating with iron particles serving as a self-heating agent. Under an alternating magnetic field, the iron particles served as a thermal source that assisted in the progression of PDMS crosslinking. The influence of self-heating iron on the properties of the fabricated Fe-PDMS composites was also investigated. The hydrosilation reaction occurring during the crosslinking process was controlled using FT-IR. The heating efficiency of PDMS 1, PDMS 2, and PDMS 3 was studied as the function of induction time (0–5 min) and the function of iron content (0%, 1%, and 30% wt.%). The results revealed that the mechanical properties of the PDMS 2 composite were enhanced compared to those of the PDMS 1 and PDMS 3 composites. The mechanical properties of PDMS 3 were the least efficient due to cluster formation. PDMS 3 exhibited the highest thermal stability among all composites. Furthermore, the swelling behavior of different materials in various organic solvents was studied. PDMS was observed to swell to the greatest extent in chloroform, while swelling to a large extent was observed in toluene, pentane, and petroleum ether. PDMS swelling was the least in n-butanol. The elastomeric behavior of crosslinked PDMS, together with its magnetic character, produces stimuli-responsive magneto-rheological composites, which are quite efficient and suitable for applications involving the removal of organic solvents.

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Synthesis and evaluation of some derivatives of polysiloxanes

Cited by 5 publications

References 24 publications

Controlled Preparation of Thermally Stable Fe-Poly(dimethylsiloxane) Composite by Magnetic Induction Heating

Controlled Preparation of Thermally Stable Fe-Poly(dimethylsiloxane) Composite by Magnetic Induction Heating

Functional Hybrid Glyconanocapsules by a One-Pot Nanoprecipitation Process

The Influence of Self-Heating Iron on the Thermal, Mechanical, and Swelling Properties of PDMS Composites for Organic Solvents Removal

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