Tuning “thiol-ene” reactions toward controlled symmetry breaking in polyhedral oligomeric silsesquioxanes

2014 ◽  
Vol 5 (3) ◽  
pp. 1046-1053 ◽  
Author(s):  
Yiwen Li ◽  
Kai Guo ◽  
Hao Su ◽  
Xiaopeng Li ◽  
Xueyan Feng ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Polyhedral Oligomeric Silsesquioxane ◽  
Building Blocks ◽  
Polyhedral Oligomeric Silsesquioxanes ◽  
Ene Reactions ◽  
Oligomeric Silsesquioxane

A facile method toward polyhedral oligomeric silsesquioxane-based nano-building blocks with controlled symmetry breaking was reported by using thiol-ene chemistry.

Poly(styrene-b-butadiene-b-styrene)-Dye-Coupled Polyhedral Oligomeric Silsesquioxanes

2010 ◽  
Vol 123-125 ◽  
pp. 169-172
Author(s):  
Steven Spoljaric ◽  
Robert A. Shanks
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Block Copolymer ◽  
Exponential Function ◽  
Polyhedral Oligomeric Silsesquioxane ◽  
Element Model ◽  
Polyhedral Oligomeric Silsesquioxanes ◽  
Creep And Recovery ◽  
Oligomeric Silsesquioxane ◽  
Colour Coordinates

Dye-coupled polyhedral oligomeric silsesquioxane (POSS) were prepared and the coloured POSS particles were ultrasonically solution dispersed in poly(styrene-b-butadiene-b-styrene) (SBS). POSS molecules contained either isobutyl or phenyl groups to provide selective compatibility with either the soft (butadiene) or hard (styrene) phase within the block copolymer. The composition and thermal stability were characterised using thermogravimetry. Colour coordinates were measured. Tensile mechanical properties, creep and recovery were determined. Creep was modeled using the 4-element model of Maxwell and Kelvin-Voigt, while recovery correlated with the stretched-exponential function of Kohlrausch, Williams and Watts.

Fluorinated polyhedral oligomeric silsesquioxanes

RSC Advances ◽  
2015 ◽  
Vol 5 (6) ◽  
pp. 4547-4553 ◽  
Author(s):  
Xiaobai Wang ◽  
Qun Ye ◽  
Jing Song ◽  
Ching Mui Cho ◽  
Chaobin He ◽  
...  
Keyword(s):  
Polyhedral Oligomeric Silsesquioxane ◽  
Polyhedral Oligomeric Silsesquioxanes ◽  
Hydrosilylation Reaction ◽  
Oligomeric Silsesquioxane

A series of fluorinated polyhedral oligomeric silsesquioxane (POSS) oils were readily prepared via hydrosilylation reaction.

Unexpected fluorescence from maleimide-containing polyhedral oligomeric silsesquioxanes: nanoparticle and sequence distribution analyses of polystyrene-based alternating copolymers

2016 ◽  
Vol 7 (1) ◽  
pp. 135-145 ◽  
Author(s):  
Mohamed Gamal Mohamed ◽  
Kuo-Chih Hsu ◽  
Jin-Long Hong ◽  
Shiao-Wei Kuo
Keyword(s):  
Polyhedral Oligomeric Silsesquioxane ◽  
Polyhedral Oligomeric Silsesquioxanes ◽  
Sequence Distribution ◽  
Alternating Copolymers ◽  
Oligomeric Silsesquioxane

Unusual fluorescent polyhedral oligomeric silsesquioxane (POSS)-containing polymers lacking any common fluorescent units because of the crystallinity and clustering of locked CO groups of POSS units.

Polyhedral Oligomeric Silsesquioxanes (Poss): Silicon Based Monomers and their Use in the Preparation of Hybrid Polyurethanes

1998 ◽  
Vol 519 ◽  
Author(s):  
Joseph J. Schwab ◽  
Joseph D Lichtenhan ◽  
Kevin P. Chaffee ◽  
Patrick T Mather ◽  
Angel Romo-Uribe
Keyword(s):  
Polyhedral Oligomeric Silsesquioxane ◽  
Polyhedral Oligomeric Silsesquioxanes ◽  
Rheological Data ◽  
Chain Extenders ◽  
Step Growth ◽  
Silicon Based ◽  
Oligomeric Silsesquioxane

AbstractA series of Polyhedral Oligomeric Silsesquioxane (POSS) monomers bearing reactive hydroxyl functionalities, suitable for incorporation into step-growth polymers, is described. These monomers are difunctional in nature and are particularly well suited for use as chain extenders in the synthesis of polyurethanes. This work describes the synthesis of these POSS monomers and their incorporation into a series of polyurethanes. Preliminary thermal, mechanical and rheological data for the POSS containing polyurethanes will also be discussed.

Cationic Micelles Based on Polyhedral Oligomeric Silsesquioxanes for Enhanced Gene Transfection

2016 ◽  
Vol 69 (4) ◽  
pp. 363 ◽  
Author(s):  
Connie K. Liu ◽  
Qingqing Dou ◽  
Sing Shy Liow ◽  
Jatin N. Kumar ◽  
Xian Jun Loh
Keyword(s):  
Transfection Efficiency ◽  
Gene Transfection ◽  
Polyhedral Oligomeric Silsesquioxane ◽  
Amphiphilic Copolymers ◽  
Polyhedral Oligomeric Silsesquioxanes ◽  
Ethyl Methacrylate ◽  
Cationic Micelles ◽  
A Cell ◽  
Oligomeric Silsesquioxane

The synthesis and gene transfection efficiency of a series of amphiphilic copolymers, poly(2-(dimethylamino)ethyl methacrylate)-poly (methacrylate isobutyl polyhedral oligomeric silsesquioxane) (PDMAEMA-POSS) copolymers are reported. The hydrophobic POSS interior allows a cell-sensitizing drug such as paclitaxel to be incorporated, whereas the cationic and hydrophilic PDMAEMA corona allows the complexation of anionic DNA to form a nano-sized polyplex. These drug-encapsulated copolymers display excellent gene transfection efficiency compared with polyethylenimine or PDMAEMA homopolymers.

scholarly journals Multifunctional Polyhedral Oligomeric Silsesquioxane (POSS) Based Hybrid Porous Materials for CO2 Uptake and Iodine Adsorption

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 221
Author(s):  
Mohamed Gamal Mohamed ◽  
Mei-Yin Tsai ◽  
Chih-Feng Wang ◽  
Chih-Feng Huang ◽  
Martin Danko ◽  
...  
Keyword(s):  
Porous Materials ◽  
High Surface ◽  
Polyhedral Oligomeric Silsesquioxane ◽  
Building Blocks ◽  
Co2 Uptake ◽  
Thermal Stabilities ◽  
Surface Areas ◽  
Different Types ◽  
Oligomeric Silsesquioxane ◽  
High Carbon Dioxide

In this study, two different types of hybrid porous organic polymers (POPs), polyhedral oligomeric silsesquioxane tetraphenylpyrazine (POSS-TPP) and tetraphenylethene (POSS-TPE), were successfully synthesized through the Friedel−Crafts polymerization of tetraphenylpyrazine (TPP) and tetraphenylethene (TPE), respectively, with octavinylsilsesquioxane (OVS) as node building blocks, in the presence of anhydrous FeCl3 as a catalyst and 1,2-dichloroethane at 60 °C. Based on N2 adsorption and thermogravimetric analyses, the resulting hybrid porous materials displayed high surface areas (270 m2/g for POSS-TPP and 741 m2/g for POSS-TPE) and outstanding thermal stabilities. Furthermore, as-prepared POSS-TPP exhibited a high carbon dioxide capacity (1.63 mmol/g at 298 K and 2.88 mmol/g at 273 K) with an excellent high adsorption capacity for iodine, reaching up to 363 mg/g, compared with the POSS-TPE (309 mg/g).

scholarly journals Effect of Alkyl Chain Length in POSS Nanocage on Non-Isothermal Crystallization Behavior of PCL/Amino-POSS Nanocomposites

Polymers ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1719 ◽  
Author(s):  
Fernández ◽  
Guzmán ◽  
Ramos ◽  
Fernández
Keyword(s):  
Size Distribution ◽  
Crystallization Temperature ◽  
Isothermal Crystallization ◽  
Crystallization Behavior ◽  
Crystallization Process ◽  
Polyhedral Oligomeric Silsesquioxane ◽  
Degree Of Crystallinity ◽  
Polyhedral Oligomeric Silsesquioxanes ◽  
Scanning Calorimetry ◽  
Oligomeric Silsesquioxane

The study of the non-isothermal crystallization behavior of polymers is of great importance due to the effect of degree of crystallinity and crystallization process on the polymer properties. The effect of aminopropylisobutyl polyhedral oligomeric silsesquioxane (APIBPOSS) and aminopropylisooctyl polyhedral oligomeric silsesquioxane (APIOPOSS) on poly(ε-caprolactone) (PCL) crystallization is studied by differential scanning calorimetry (DSC) under non-isothermal conditions and polarized optical microscopy (POM). The crystallization kinetics is analyzed using the Avrami and Mo models, and effective activation energies are evaluated by the Friedman isoconversional method. The results show that the compatibility between polyhedral oligomeric silsesquioxanes (POSS) and PCL and POSS loading affect the crystallization process. A higher crystallization temperature, a narrower size distribution of crystallite, and a faster crystallization rate are obtained in the presence of all the studied contents of APIBPOSS and at lower contents of APIOPOSS. At APIOPOSS contents higher than 2 wt %, the crystallization temperature is lowered, the size distribution of crystallite is broadened, and the crystallization process is retarded. The presence of POSS leads to an increase in the number of nucleation sites, and a reduction in the size of the crystallite and the overall degree of crystallinity, as a result of the confinement of PCL chains caused by POSS nanoparticles.

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