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Relevant academic research and scientific papers

Preparation of solid-state composite electrolytes based on organic/inorganic hybrid star-shaped polymer and PEG-functionalized POSS for all-solid-state lithium battery applications

A series of composite electrolytes (CEs) consisting of organic/inorganic hybrid star-shaped polymer (SPP13), plasticizer (PEG-functionalized POSS derivatives), and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) were prepared to investigate the effects of the composite compositions and PEG chain length of PEs on the properties of CEs. SPP13 was prepared via ATRP from poly(ethylene glycol) methyl ether methacrylate (PEGMA) and methacryl- cyclohexyl-POSS (MA-POSS) using an octafunctional initiator, and the PEG-functionalized POSS derivatives were synthesized by the hydrosilylation reaction of octakis(dimethylsilyloxy)silsesquioxane (OHPS) and allyl-PEG. The CEs were found to be dimensionally-stable enough to separate the electrodes in batteries, but they still possessed high mobility of ion-conducting P(PEGMA) segments, as estimated by the low glass transition temperatures (Tg). The CEs having solid-state show quite high ionic conductivity (4.5 × 10-5 S cm-1 at 30 C) which is about three times of magnitude larger than that of the matrix polymer (SPP13) electrolyte (1.5 × 10-5 S cm-1 at 30 C). The CEs were electrochemically stable up to +4.2 V without the decomposition of electrolytes. An all-solid-state lithium battery prepared from the CEs exhibited larger discharge capacity than that prepared from the SPP13 electrolyte at 60 C.

Hydrosilylation of allyl alcohol with [HSiMe2OSiO1.5]8: Octa(3-hydroxypropyldimethylsiloxy)octasilsesquioxane and its octamethacrylate derivative as potential precursors to hybrid nanocomposites

Octakis(3-hydroxypropyldimethylsiloxy)octasilsesquioxane (OHPS) can be synthesized by direct hydrosilylation of allyl alcohol with octakis(dimethylsiloxy)octasilsesquioxane, (HSiMe2O)Si8O12 (Q8M8(H)), using platinum divinyltetramethyldisiloxane [Pt(dvs)] as catalyst. Surprisingly, C-hydrosilylation occurs in preference to O-silylation. Hydrosilylation of trimethylsiloxy-2-propene with Q8M8(H), followed by desilylation also gives pure OHPS. OHPS reacts with methacryloyl chloride to give octakis(3-methacryloxypropyldimethylsiloxy)octasilsesquioxane (OMPS), a thermal and UV/vis curable precursor to organic/inorganic nanocomposites. Direct hydrosilylation of Q8M8(H) with 2-allyloxyethanol also proceeds primarily via C- rather than O-silylation. In contrast, compounds such as 1,3,5,7-tetramethylcyclotetrasiloxane (D4(H)), 1,1,3,3-tetramethyldisiloxane (TMDS) or terminal Si - H functionalized poly(dimethylsiloxane) (PDMS-H, MW = 400), give significant amounts of O-silylation along with C-silylation. Initial catalyst concentration studies suggest that the catalytic cycle requires the intermediacy of Pt cluster complexes in contrast to recent studies on the mechanism of hydrosilylation which suggest monometallic complex catalysis.

Synthesis of the organic/inorganic hybrid star polymers and their inclusion complexes with cyclodextrins

In this study, we synthesized a series of the organic/inorganic hybrid star PCLs. These star PCLs can form inclusion complexes (ICs) with α- and γ-CD, but not with β-CD. These CD ICs were characterized by XRD, solid-state 13C CP/MAS NMR spectroscopy, 1H NMR spectroscopy, FT-IR spectroscopy, DSC, and TGA. Our results suggest that the PCL chains of these star polymers lose their original crystalline properties and were included inside the channels provided by the CDs to form a columnar crystalline structures. The stoichiometries (PCL-.CD) that we determined by 1H NMR spectroscopy for all of the ICs with α- or γ-CD are higher than those of the corresponding CD/linear PCL ICs because of the steric hindrance around the bulky POSS core, which causes some of the ε-caprolactone units near the core to be free from complexation with the CDs. From these analyses, we proposed some possible structures for the CD/star PCL ICs.

Thermally curable organic/inorganic hybrid polymers as gate dielectrics for organic thin-film transistors

New low-temperature curable organic/inorganic hybrid polymers were designed and synthesized as gate dielectrics for organic thin-film transistors (OTFTs). Allyl alcohols were introduced to polyhedral oligomeric silsesquioxane (POSS) via hydrosilyation to produce an alcohol-functionalized POSS derivative (POSS-OH). POSS-OH was then reacted with hexamethoxymethylmelamine at carrying molar ratios at 80 C in the presence of a catalytic amount of p-toluenesulfonic acid to give highly cross-linked network polymers (POSS-MM). The prepared thin films were smooth and hard after the thermal cross-linking reaction and had very low leakage currents (-8 A/cm2) with no significant absorption over the visible spectral range. Pentacene-based OTFTs using the synthesized insulators as gate dielectric layers had higher hole mobilities (up to 0.36 cm2/Vs) than a device using thermally cross-linked poly(vinyl phenol) and melamine as the gate dielectric layer (0.18 cm2/Vs).

POLYMER ELECTROLYTE MEMBRANE FOR RECHARGEABLE LITHIUM BATTERY AND RECHARGEABLE LITHIUM BATTERY INCLUDING THE SAME

Provided are a polymer electrolyte membrane for a lithium secondary battery comprising: lithium salt and polymers, wherein the polymers include star-shaped polymers represented by chemical formula 1 and basket-shaped polymers represented by chemical formula 7; and a lithium secondary battery including the same. In chemical formulas 1 and 7, each substituent is as defined in the specification.

Synthesis of POSS derived organic-inorganic hybrid esters for insulating oil applications

In this work, a new family of polyhedral oligomeric silsesquioxanes (POSS) based esters have been synthesized that consists eight ester functional groups. These are classified into Type-I and Type-II esters based on the starting materials, octakis(3-chlor

Star-shaped POSS-polycaprolactone polyurethanes and their shape memory performance

Star-shaped polyhedral oligomeric silsesquioxane (SPOSS)-based multi-arm poly(ε-caprolactones) (PCLs) with various arm lengths were synthesized by ring opening polymerization of ε-caprolactone. Increasing the PCL arm lengths was observed to increase the m

Efficient gene delivery with paclitaxel-loaded DNA-hybrid polyplexes based on cationic polyhedral oligomeric silsesquioxanes

We present a novel hybrid cationic polymer based on polyhedral oligomeric silsesquioxanes (POSS). This is the first report of using a cationic POSS-based material for gene delivery. Due to its amphiphilic properties, hydrophobic drugs such as paclitaxel can be encapsulated within the hydrophobic core of this polymer. In this paper, it is shown that paclitaxel-encapsulated hybrid POSS-based polyplexes show superior gene transfection efficiency in human breast cancer cells than the non drug-loaded polyplexes.

THERMAL RESPONSIVE POLYMER SILOXANES, COMPOSITIONS, AND METHODS AND APPLICATIONS RELATED THERETO

The invention relates to materials comprising siloxanes, preferably the materials have thermal-responsive properties. In some embodiments, the invention relates to silsesquioxane groups functionalized with polymers. In another embodiment, silsequioxane-polymer conjugates comprise polylactone segments. The silsequioxane- polymer conjugates may be crosslinked together to form a material, and these materials may be functionalized with bioactive compounds so that the materials have desirable biocompatibility or bioactivity when used in medical devices. In further embodiments, the invention relates to composite materials that contain a polymer matrix and aggregates, and in some embodiments, methods of making, and methods of using these materials. Preferably, the aggregates are calcium phosphate aggregates. Preferably, the material is resistant to fracture. In further embodiments, the materials are used in surgical procedures of bone replacement. In further embodiments, the materials contain polyhedral silsesquioxanes and/or biodegradable segments.