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1. The ultimate Lewis acid catalyst: using tris(pentafluorophenyl) borane to create bespoke siloxane architectures

Author:
Hetian Gao; Andrew Battley; Erin M. Leitao
Source:
Chemical communications 2022 v.58 no.54 pp. 7451-7465
ISSN:
1364-548X
Subject:
siloxanes,   etc   ; Lewis acids; catalysts;     Show all 3 Subjects
Abstract:
... The breadth of utility of a commercially available and stable strong Lewis acid catalyst, tris(pentafluorophenyl)borane, has been explored, highlighting its use towards a wide range of unique siloxane products and their corresponding applications. This article focuses on the variety of different outcomes that this impressive borane offers in controlled and selective manners by the variation of rea ...
DOI:
10.1039/d2cc00441k

2. Embedded Core–Shell 3D Printing (eCS3DP) with Low-Viscosity Polysiloxanes

Author:
Rahul Karyappa; Wei Huang Goh; Michinao Hashimoto
Source:
ACS applied materials & interfaces 2022 v.14 no.36 pp. 41520-41530
ISSN:
1944-8252
Subject:
siloxanes,   etc   ; ethanol; gels; liquids; robots;     Show all 5 Subjects
Abstract:
... Flexible core–shell 3D structures are essential for the development of soft sensors and actuators. Despite recent advancements in 3D printing, the fabrication of flexible 3D objects with internal architectures (such as channels and void spaces) remains challenging with liquid precursors due to the difficulty to maintain the printed structures. The difficulty of such fabrication is prominent especi ...
DOI:
10.1021/acsami.2c09041

3. Synthesis of Rod-Shaped ZnO/Polysiloxane Micromotors with Patch-Dependent Motion Modes

Author:
Xunqiang Zhang; Wenqing Xie; Sinan Du; Huaguang Wang; Zexin Zhang
Source:
Langmuir 2022 v.38 no.14 pp. 4389-4395
ISSN:
1520-5827
Subject:
siloxanes,   etc   ; geometry; photocatalysis; zinc oxide;     Show all 4 Subjects
Abstract:
... Inorganic particles with photocatalytic properties are excellent candidates for the fabrication of micromotors. To achieve self-propulsion, the geometric and chemical symmetries of inorganic particles should be broken. However, the synthesis of micromotors with different geometric and chemical symmetries remains challenging. In this paper, a simple synthesis method is proposed to prepare rod-shape ...
DOI:
10.1021/acs.langmuir.2c00123

4. Controlled Ring-Opening Polymerization of Hexamethylcyclotrisiloxane Catalyzed by Trisphosphazene Organobase to Well-Defined Poly(dimethylsiloxane)s

Author:
Jinfeng Shi; Zhengyang Liu; Na Zhao; Shaofeng Liu; Zhibo Li
Source:
Macromolecules 2022 v.55 no.7 pp. 2844-2853
ISSN:
1520-5835
Subject:
siloxanes,   etc   ; molecular weight; organocatalysts; polymerization;     Show all 4 Subjects
Abstract:
... Precise synthesis of well-defined functional polysiloxanes on demand was challenging due to chain transfer and backbiting side reactions during ring-opening polymerization (ROP) of cyclosiloxane monomers. In this contribution, a trisphosphazene base (C₃N₃-Me-P₃) with medium basicity and bulky molecular size was demonstrated as an effective organocatalyst to realize the controlled ROP of hexamethyl ...
DOI:
10.1021/acs.macromol.1c02654

5. Organic–Inorganic Hybrid Polysiloxane Brushes with Improved Lubrication and Load-Bearing Capacity

Author:
Yizhe Liu; Chenxi Qin; Rongnian Xu; Yubo Liu; Yang Wu; Bo Yu; Xiaowei Pei; Feng Zhou
Source:
Langmuir 2022 v.38 no.9 pp. 2832-2839
ISSN:
1520-5827
Subject:
siloxanes,   etc   ; durability; friction; lubrication; silica;     Show all 5 Subjects
Abstract:
... With the development of microelectromechanical systems (MEMS), ultrathin dry lubrication coatings have received significant attention. In this study, a nanoscale organic–inorganic hybrid lubricative coating (OHL) with a low friction coefficient and wear resistance was developed by grafting polysiloxane brushes on an inorganic silica sol layer. Friction evaluations, including the friction coefficie ...
DOI:
10.1021/acs.langmuir.1c02937

6. Cationic core/shell polysiloxane acrylate emulsion: synthesis, film morphology, and performance on cotton pigment coloration

Author:
Xianghui Dai; Xiaomin Xu; Xia Yu; Xiao Sun; Jianjun Pan; Xiaoting Zhang; Jie Min
Source:
Cellulose 2022 v.29 no.3 pp. 2093-2106
ISSN:
0969-0239
Subject:
siloxanes,   etc   ; cellulose; color; cotton; emulsions; latex;     Show all 6 Subjects
Abstract:
... In this paper, acrylate-terminated polysiloxane was synthesized and used as raw materials for the synthesis of cationic core/shell polysiloxane acrylate emulsion, which was applied as binders in the pigment dyeing of cotton fabrics. The experimental results showed that: the cationic core/shell polysiloxane acrylate emulsion in this article is in nano size of 100 nm. During the film formation of th ...
DOI:
10.1007/s10570-021-04396-3

7. Palladium-Catalyzed Suzuki–Miyaura Cross-Coupling of Oxygen-Substituted Allylboronates with Aryl/Vinyl (Pseudo)Halides

Author:
Jie Li; Xinhui Zhang; Yisen Yao; Yapei Gao; Wen Yang; Wanxiang Zhao
Source:
Journal of organic chemistry 2022 v.87 no.10 pp. 6951-6959
ISSN:
1520-6904
Subject:
siloxanes,   etc   ; Suzuki reaction; organic chemistry; oxygen; regioselectivity;     Show all 5 Subjects
Abstract:
... An efficient palladium-catalyzed Suzuki–Miyaura cross-coupling reaction of oxygen atom-substituted allylboronates with aryl/vinyl bromides, iodides, and triflates has been developed. The present coupling reactions proceeded smoothly to provide a variety of allylic siloxanes with high efficiency and excellent regioselectivity. This protocol features broad substrate scope, excellent functional group ...
DOI:
10.1021/acs.joc.2c00634

8. Poly(hydromethylsiloxane)-derived high internal phase emulsion-templated materials (polyHIPEs) containing palladium for catalytic applications

Author:
Jan Mrówka; Robert Kosydar; Mariusz Gackowski; Jacek Gurgul; Lidia Lityńska-Dobrzyńska; Bartosz Handke; Alicja Drelinkiewicz; Magdalena Hasik
Source:
Journal of materials science 2022 v.57 no.26 pp. 12463-12482
ISSN:
0022-2461
Subject:
siloxanes,   etc   ; crosslinking; emulsions; hydrogenation; microstructure; nanocatalysts; palladium; styrene;     Show all 8 Subjects
Abstract:
... Cross-linking of poly(hydromethylsiloxane) (PHMS) with 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane (D₄ⱽⁱ) in water-in-oil high internal phase emulsion (HIPE) whose aqueous phase comprises PdCl₂ is developed as a new, one-step route for the fabrication of polysiloxane-based, porous HIPE-templated materials (polyHIPEs) containing palladium. It is shown that the microstructure of the sys ...
DOI:
10.1007/s10853-022-07414-2

9. Ultrafast self-healing and self-adhesive polysiloxane towards reconfigurable on-skin electronics

Author:
Miao Tang; Zili Li; Kaiqing Wang; Yizhou Jiang; Mi Tian; Yajie Qin; Ye Gong; Zhuo Li; Limin Wu
Source:
Journal of materials chemistry A 2022 v.10 no.4 pp. 1750-1759
ISSN:
2050-7496
Subject:
siloxanes,   etc   ; air; ambient temperature; crosslinking; electronics; strength (mechanics);     Show all 6 Subjects
Abstract:
... While polysiloxanes are the most widely used interface materials for on-skin electronics, they usually do not exhibit mechanical robustness and fast healing speed simultaneously due to the inherent contradiction of this pair of performances, let alone combining self-adhesiveness, reconfigurability, etc. Herein, we address this conundrum by building polydimethylsiloxane–dithiothreitol block polymer ...
DOI:
10.1039/d1ta09096h

10. Dual-crosslinking side chains with an asymmetric chain structure: a facile pathway to a robust, self-healable, and re-dissolvable polysiloxane elastomer for recyclable flexible devices

Author:
Ziqian Lin; Haoyu Deng; Yang Hou; Xiaoxuan Liu; Ruijie Xu; Hongping Xiang; Zhongquan Peng; Minzhi Rong; Mingqiu Zhang
Source:
Journal of materials chemistry A 2022 v.10 no.20 pp. 11019-11029
ISSN:
2050-7496
Subject:
siloxanes,   etc   ; adhesion; carbon nanotubes; crosslinking; hydrogen; imines; tensile strength;     Show all 7 Subjects
Abstract:
... The facile fabrication of robust, self-healable, and re-dissolvable polysiloxane elastomers for use in recyclable flexible devices is highly desired yet quite a challenge. Herein, a strategy involving dual-crosslinking side chains with an asymmetric chain structure is proposed to overcome the related challenges. Dual crosslinking is readily undergone between diethylenetriamine-functionalized polys ...
DOI:
10.1039/d2ta01535h

11. Robust Superamphiphobic Fabrics with Excellent Hot Liquid Repellency and Hot Water Vapor Resistance

Author:
Ning Tian; Kai Chen; Jinfei Wei; Junping Zhang
Source:
Langmuir 2022 v.38 no.18 pp. 5891-5899
ISSN:
1520-5827
Subject:
siloxanes,   etc   ; durability; energy; liquids; polyesters; soybean oil; water vapor;     Show all 7 Subjects
Abstract:
... Superamphiphobic surfaces progress rapidly but suffer from the issues of low repellency to hot liquids, complicated and nonaqueous preparation methods, and low durability. Here, a simple waterborne approach is developed to fabricate robust superamphiphobic fabrics with excellent hot liquid repellency and hot water vapor resistance. First, a perfluorodecyl polysiloxane (FD-POS) aqueous suspension w ...
DOI:
10.1021/acs.langmuir.2c00532

12. Design and operation of an industrial size adsorption-based cleaning system for biogas use in fuel cells

Author:
Marta Gandiglio
Source:
Energy 2022 v.259 pp. 124941
ISSN:
0360-5442
Subject:
siloxanes,   etc   ; biogas; energy; experimental design; sewage; sorbents; wastewater treatment;     Show all 7 Subjects
Abstract:
... The use of biogas, one of the main players in the energy transition, requires the efficient removal of harmful traces of impurities. Reliable and robust purification systems are therefore required before the biogas is fed into cogeneration or upgrading plants. In this work, an industrial-scale biogas purification system for the deep removal of impurities is analysed. The experimental design phase ...
DOI:
10.1016/j.energy.2022.124941

13. In situ formation of polymethylsiloxane nanofilaments on pristine cotton stalk with natural interconnected pores for rapid and recyclable organic solvents absorption

Author:
Tao Liu
Source:
Industrial crops and products 2022 v.186 pp. 115176
ISSN:
0926-6690
Subject:
siloxanes,   etc   ; absorbents; absorption; contact angle; cotton; hydrolysis; hydrophobicity; wettability;     Show all 8 Subjects
Abstract:
... The creation of a superhydrophobic surface with simplified hydrophobic steps still faces great challenges. Herein, an in situ one-step hydrophobic strategy of growing polysiloxane nanofilaments onto pristine rod-shaped cotton stalk (CS) surface is used to prepare a new bulk superhydrophobic CS absorbent. The rich hydroxyl groups contained in CS directly polymerize with the silanols generated by th ...
DOI:
10.1016/j.indcrop.2022.115176

14. Amphiphobic polytetrafluoroethylene membrane with a ring-on-string-like micro/nano structure for air purification

Author:
Xin Lu; Yingdong Chen; Wentao Yan; Kaizhen Wang; Yong Zhou; CongJie Gao
Source:
Journal of membrane science 2022 v.652 pp. 120476
ISSN:
0376-7388
Subject:
siloxanes,   etc   ; air; energy; filtration; hexadecane; liquids; oils; polytetrafluoroethylene; silica; smoke;     Show all 10 Subjects
Abstract:
... Polytetrafluoroethylene (PTFE) membranes with three-dimensional interconnected porous networks are usually used as air filters. However, they are easily contaminated by oily aerosols in air filtration, resulting in a decrease in filtration efficiency. Herein, a strategy for the preparation of amphiphobic PTFE membranes with a ring-on-string-like micro/nano structure for air purification was propos ...
DOI:
10.1016/j.memsci.2022.120476

15. Thermodynamic Picture of Phase Segregation during the Formation of Bicontinuous Concentric Lamellar (bcl) Silica

Author:
Erna Febriyanti; Nadiatus Silmi; Veinardi Suendo; Rino R. Mukti; Pipit U. Vivitasari; Damar R. Adhika; Yutaka Majima; Suprijadi; Ismunandar
Source:
Langmuir 2022 v.38 no.4 pp. 1368-1379
ISSN:
1520-5827
Subject:
siloxanes,   etc   ; Gibbs free energy; hydrolysis; micelles; silica; surface tension; topology;     Show all 7 Subjects
Abstract:
... The thermodynamic picture describing the formation mechanism of bicontinuous concentric lamellar (bcl) nanostructured silica particles, bcl silica, was investigated thoroughly. A series of classical kinetics of bcl silica by varying the synthesis time were employed to observe the morphological evolution of bcl silica. The formation mechanism of bcl silica is proposed as the hydrolysis and condensa ...
DOI:
10.1021/acs.langmuir.1c02490

16. A facile strategy to simultaneously increase surface roughness and reduce surface energy for the preparation of water-repellent, recyclable and self-cleaning expanded perlite

Author:
Tao Liu
Source:
Colloids and surfaces 2022 v.655 pp. 130253
ISSN:
0927-7757
Subject:
siloxanes,   etc   ; desorption; energy; hydrophilicity; hydrophobicity; perlite; sorption; surface roughness; vapors; wettability;     Show all 10 Subjects
Abstract:
... Although expanded perlite with abundant sources and low cost has been widely used in a diverse of different fields, it still requires multi-step processing to prepare desired functional materials, leading to complicated experimental procedures. And imparting new functionalities to expanded perlite with simple and effective methods remains a challenge. In this paper, a novel facile chemical vapor d ...
DOI:
10.1016/j.colsurfa.2022.130253

17. Spatial distribution and accumulation profiles of volatile methylsiloxanes in Tokyo Bay, Japan: Mass loadings and historical trends

Author:
Yuichi Horii; Kotaro Minomo; James C.W. Lam; Nobuyoshi Yamashita
Source:
Science of the total environment 2022 v.806 pp. 150821
ISSN:
0048-9697
Subject:
siloxanes,   etc   ; Japan; aquatic environment; estuaries; industrialization; pollution; sewage treatment; surface water;     Show all 8 Subjects
Abstract:
... We investigated mass loading and the spatial distribution of volatile methylsiloxanes (VMSs) including four cyclic VMSs (D3–D6; cVMSs, the number refers to the number of SiO bonds) and three linear VMSs (L3–L5; lVMSs) in Tokyo Bay, Japan, which is one of the most industrialized, urbanized, and populated areas in the world. Based on the VMS concentrations determined in eight main inflow rivers to t ...
DOI:
10.1016/j.scitotenv.2021.150821

18. Bioinspired Bola Polysiloxane for Wettability, Breathability, and Softness in Fabrics

Author:
Yue Sun; Wencai Xiong; Wenjing Cheng; Haifeng Wang; Taoyan Mao
Source:
Industrial & engineering chemistry process design and development 2022 v.61 no.21 pp. 7205-7215
ISSN:
1520-5045
Subject:
siloxanes,   etc   ; friction; hardness; hydrophilicity; process design; quaternary ammonium compounds; water vapor; wettability;     Show all 8 Subjects
Abstract:
... The wettability, breathability, and softness of fabrics are difficult to effect synergistically, so they cannot meet the requirements of personal comfort. Here, inspired by some amazing superhydrophilic structures in nature, a synergistic strategy is reported to create a novel Bola quaternary ammonium polyether polysiloxane (BQPEPS) with a water transport channel and softness performance with a un ...
DOI:
10.1021/acs.iecr.2c00021

19. Polysiloxane Coatings Biodeterioration in Nature and Laboratory

Author:
Maxim Danilaev; Galina Yakovleva; Sergey Karandashov; Vladimir Kuklin; Hong Quan Le; William Kurdy; Olga Ilinskaya
Source:
Microorganisms 2022 v.10 no.8 pp. -
ISSN:
2076-2607
Subject:
siloxanes,   etc   ; Aspergillus; Penicillium; biodegradation; crosslinking; dust; glass; humidity; pollution; polymethylmethacrylate; silicon; temperature;     Show all 12 Subjects
Abstract:
... Objects and structures made of organic glass require protection from damage caused by external factors. Light, humidity, temperature, dust pollution and, undoubtedly, microorganisms lead to the deterioration of optical and mechanical properties. Polysiloxane-based protective coatings, consisting of silicon–oxygen backbones linked together with organic side groups attached to the silicon atoms, are ...
DOI:
10.3390/microorganisms10081597

20. Thermal, mechanical, and rheological properties of micro-fibrillated cellulose-reinforced starch foams crosslinked with polysiloxane-based cross-linking agents

Author:
Mohammad Mahbubul Hassan; Ian J. Fowler
Source:
International journal of biological macromolecules 2022 v.205 pp. 55-65
ISSN:
0141-8130
Subject:
siloxanes,   etc   ; biodegradability; cellulose; crosslinking; foams; hydrophobicity; pollution; starch; tensile strength; water uptake;     Show all 10 Subjects
Abstract:
... The disposal of non-degradable plastic packaging and plastic pollution are widespread environmental problems. The development of a fully biodegradable alternative foam packaging with excellent water barrier properties from polysaccharides is quite challenging. In this work, micro-fibrillated cellulose fiber-reinforced starch foams (MFC-SFs) were developed by crosslinking with two poly(siloxane)-ba ...
DOI:
10.1016/j.ijbiomac.2022.02.017