A transparent cyclo-linear polyphenylsiloxane elastomer integrating high refractive index, thermal stability and flexibility

Fan, Xianpeng; Cao, Xinyu; Shang, Xinxin; Zhang, Xianglan; Huang, Cheng; Zhang, Jingnan; Zheng, Kuo; Ma, Yingfei

doi:10.1039/d1py00688f

Cited by 9 publications

(7 citation statements)

References 54 publications

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“…34 The band at 2138 cm À1 is assigned to the characteristic absorption peak of the Si H bond. 35 Compared with PTDS, the peak at 2138 cm À1 of EPHS is weaker, which indicated that partial contents of the Si H bonds had participated in the addition reaction. Meanwhile, the disappearance of the peak signal at 2138 cm…”

Section: Discussionmentioning

confidence: 95%

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The synthesis of a secondary branched epoxy‐modified silicone resin and its application at low temperature

Pan,

Lin,

Luo

2023

J of Applied Polymer Sci

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To enhance the fracture toughness of epoxy resin at low temperature, a secondary branched epoxy‐terminated silicone resin (ESR‐6) was synthesized and incorporated into bisphenol A epoxy resin at different contents. The structure of ESR‐6 was characterized by Fourier transform infrared spectroscopy and nuclear magnetic resonance (1H NMR), and the fracture surface of the composites was observed by scanning electron microscope (SEM) and atomic force microscopy. At room temperature and − 70°C, the maximum values of elongation at break were 15.78% and 12.55% with 10 wt% ESR. Compared with those of neat epoxy resin, the values of elongation at break of the composite were increased by 50.86% and 36.12%. The results of dynamic mechanical analysis also showed that the toughness of the modified resin had been improved. The SEM images of the fracture surfaces suggested that the fracture mode of the modified resin changed from brittle one to plastic one because of the addition of ESR‐6, which further confirmed the toughening effect of ESR‐6. These research results may provide a new strategy for enhancing the low‐temperature toughness of epoxy resins.

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Section: Discussionmentioning

confidence: 95%

“…EPHS and ESR-6 have obvious signals at 1410 cm À1 ascribed to the characteristic peak of Si CH 2 34. The band at 2138 cm À1 is assigned to the characteristic absorption peak of the Si H bond 35. Compared with PTDS, the peak at 2138 cm À1 of EPHS is weaker, which indicated that partial contents of the Si H bonds had participated in the addition reaction.…”

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confidence: 96%

The synthesis of a secondary branched epoxy‐modified silicone resin and its application at low temperature

Pan,

Lin,

Luo

2023

J of Applied Polymer Sci

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“…No soluble fraction was detected in the swelling test, which validates that all PDMS CLs underwent reaction and crosslinking. The degree of swelling is inversely proportional to the extent of cross-linking; as the cross-linking degree increases, the swelling degree diminishes [11,[39][40][41]. As the content of CL increased, there was a corresponding decrease in the swelling degree.…”

Section: Properties Of Pdms Cross-linked With Si-h Terminated Teos He...mentioning

confidence: 99%

Preparation and Properties of PDMS elastomer cross-linked with hydrolyzate of TEOS, HEDS, or OETS oligomers: influence of cross-linker structure

Sato,

Hayami,

Yamamoto

et al. 2023

Preprint

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Linear oligoethoxysiloxanes were hydrolyzed, and the resulting hydrolyzates were dimethylsilylated to produce Si–H terminated ethoxysiloxanes (CLs). These CLs were characterized using gel permeation chromatography, nuclear magnetic resonance, and Fourier-transform infrared spectroscopy. The results indicated the formation of highly condensed cyclic siloxanes, four-membered cyclic siloxanes, and linearly condensed cyclic siloxanes when derived from tetraethoxysilane, hexaethoxydisiloxane, and octaethoxytrisiloxane, respectively. The CLs were subsequently reacted with vinyl-terminated polydimethylsiloxane in the presence of the Karstedt catalyst to yield PDMS elastomers, which are comprised of di- and quadra-functional silicones. Tests for transmittance, thermal properties, tensile strength, and swelling in toluene were conducted to assess the impact of the molecular weight and microstructure of the CLs on the final products. As the number of silicon atoms in the linear oligoethoxysiloxanes increased, there was a noticeable rise in the secant modulus and a reduction in the degree of swelling. These findings suggest that the structure of PDMS elastomers can be tailored by varying the structure of the linear oligosiloxanes used as a cross-linking agent.

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“…[3] Higher RI silicones are normally achieved by incorporating aromatic moieties on the silicone backbone. [4][5][6][7][8] Phenyl compounds are widely available commercially and may contain phenylmethyl-and/or diphenylsilicone monomers, typically in addition to Me 2 SiO monomers as random copolymers or blocks. [9][10][11] Their preparation has been optimized in industry, but using challenging chemistry: arylboranes, Grignard processes etc.…”

Section: Introductionmentioning

confidence: 99%

High Refractive Index, Enantiopure Silicones Based on BINOL

Meléndez-Zamudio

Silverthorne

Brook

2022

Macromol. Rapid Commun.

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The high refractive index aromatic compound, binaphthol (BINOL), is readily incorporated into silicone polymer chains using the Piers–Rubinsztajn (PR) reaction; alternating and random linear copolymers, and elastomers are available. The highest refractive index (RI) materials are BINOL rich. It is not possible to directly make high refractive index linear polymers with very short HSi‐capped, telechelic silicone chains, as they do not react cleanly. However, chain extending short vinyl‐capped BINOL macromers with simple arylsilanes using hydrosilylation leads to polymers with a molar mass of up to 8000 and refractive indices of up to 1.58. Elastomers are prepared using similar processes. The reactions are facile to practice and suggest BINOL can be harnessed in these and other processes to augment RI.

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A transparent cyclo-linear polyphenylsiloxane elastomer integrating high refractive index, thermal stability and flexibility

Abstract: A new type of cyclo-linear structured high phenyl content siloxane elastomer (Ph-CLS-E) is prepared through “one-pot” hydrosilylation reaction that take advantage of the reactivity differences of the cyclic, linear precursors...

Cited by 9 publications

References 54 publications

The synthesis of a secondary branched epoxy‐modified silicone resin and its application at low temperature

The synthesis of a secondary branched epoxy‐modified silicone resin and its application at low temperature

Preparation and Properties of PDMS elastomer cross-linked with hydrolyzate of TEOS, HEDS, or OETS oligomers: influence of cross-linker structure

High Refractive Index, Enantiopure Silicones Based on BINOL

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