scholarly journals Properties of Polyhedral Oligomeric Silsesquioxane-Modified Cellulose Insulation Paper with Different Number of Phenyls

2021 ◽  
Vol 39 (2) ◽  
pp. 383-389
Author(s):  
Jin Gao ◽  
Sihua Guo ◽  
Jiaquan Liu ◽  
Jiao Li
Keyword(s):  
Mechanical Properties ◽  
Mean Square Displacement ◽  
Polyhedral Oligomeric Silsesquioxane ◽  
Insulation Property ◽  
Large Bulk ◽  
Paper Insulation ◽  
Oligomeric Silsesquioxane ◽  
Cellulose Insulation ◽  
Nano Size ◽  
Modified Cellulose

Polyhedral oligomeric silsesquioxane (POSS) has a total of eight substituents. The number of substituents determines the modification effect of POSS. Through simulation of molecular dynamics, this paper explores how the number of substituents affects the POSS-modified cellulose insulation paper. Specifically, the mechanical properties, thermal stability and polarizability were calculated for cellulose models with 1-phenyl POSS, 2-phenyl POSS, 3-phenyl POSS, 4-phenyl POSS, 5-phenyl POSS, 6-phenyl POSS, 7-phenyl POSS, and 8-phenyl POSS, respectively. The results show that the cellulose model modified by 6-phenyl POSS achieved better effect than the other seven models, as evidenced by its distinctively large bulk modulus, shear modulus, and elastic modulus. Besides, the cellulose model modified by 6-phenyl POSS had the most stable and the minimum mean square displacement (MSD). This is because the mechanical properties of the insulation paper are improved, as the motion of cellulose chains is inhibited by the nano-size effect of POSS and the effect of phenyls. Further, the cellulose model modified by 6-phenyl POSS also had the smallest polarizability among the modified models. Therefore, the 6-phenyl POSS-modified cellulose model can effectively reduce the polarizability of cellulose, uniform the electric field distribution in oil-paper insulation system, and thus enhance the insulation property of transformers.

Poly(ε-caprolactone)-based shape memory polymers crosslinked by polyhedral oligomeric silsesquioxane

RSC Advances ◽  
2016 ◽  
Vol 6 (93) ◽  
pp. 90212-90219 ◽  
Author(s):  
Pengfei Yang ◽  
Guangming Zhu ◽  
Xuelin Shen ◽  
Xiaogang Yan ◽  
Jing Nie
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Shape Memory ◽  
Polyhedral Oligomeric Silsesquioxane ◽  
Shape Memory Polymers ◽  
Complete Recovery ◽  
Memory Network ◽  
Oligomeric Silsesquioxane

A POSS–PCL shape memory network is synthesized. The cage-like POSS not only serves as a chemical netpoint, also causes improvement in mechanical properties. Optimized networks exhibit both excellent tensile strength and nearly complete recovery.

A high-emissive and stable luminescent silafluorene hybrid constructed by hydrosilylation

2019 ◽  
Vol 43 (3-4) ◽  
pp. 144-148
Author(s):  
Ping Tang ◽  
Kai Xiang ◽  
Huijie Wei ◽  
Shuhong Li ◽  
Caihong Xu
Keyword(s):  
Thermal Stability ◽  
Polyhedral Oligomeric Silsesquioxane ◽  
Target Compound ◽  
Hybrid Molecule ◽  
Inorganic Hybrid ◽  
Hydrosilylation Reaction ◽  
Solid Fluorescence ◽  
Oligomeric Silsesquioxane ◽  
Nano Size ◽  
Thermal Stability Of

Under Karstedt’s catalyst, an organic–inorganic hybrid fluorescent nano-molecular dendrimer has been synthesized by grafting silafluorene units onto the polyhedral oligomeric silsesquioxane core through hydrosilylation reaction. The new hybrid molecule exhibits high solid fluorescence quantum efficiency because of the nano-size and large steric hindrance of the polyhedral oligomeric silsesquioxane core. Thermogravimetric analysis shows that the thermal stability of the target compound is effectively improved by the presence of polyhedral oligomeric silsesquioxane.

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.

Thermal and mechanical properties of polymethyl mathacrylate reinforced by polyhedral oligomeric silsesquioxane

e-Polymers ◽  
2011 ◽  
Vol 11 (1) ◽  
Author(s):  
Benghong Yang ◽  
Meng Li ◽  
Bangping Song ◽  
Yun Wu
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Polyhedral Oligomeric Silsesquioxane ◽  
Thermal And Mechanical Properties ◽  
Sem Images ◽  
Pmma Matrix ◽  
Oligomeric Silsesquioxane ◽  
Tga And Dsc ◽  
Thermal Stability Of

AbstractA series of Inorganic/organic nanocomposites were prepared by blending cage-like carboxyl-bearing polyhedral oligomeric silsesquioxane (carboxyl-POSS) with polymethyl mathacrylate (PMMA) in THF solvent. FTIR and 29Si-NMR were employed to characterize the structures of the nanocomposites. SEM images showed that the as-prepared films were smooth and no aggregation of carboxyl-POSS was observed. TGA and DSC results showed that the incorporation of small amount of nanosize carboxyl-POSS enhanced the thermal stability of PMMA. When 1.0 wt% of carboxyl-POSS was incorporated into PMMA matrix, the Tg and Td increased by 16.9 °C and 21.0 °C, respectively. However, higher POSS contents (>1.0 wt%) would deteriorate the thermal and mechanical properties of the nanocomposites.

The research progress of polyhedral oligomeric silsesquioxane (POSS) applied to electrical energy storage elements

2017 ◽  
Vol 10 (02) ◽  
pp. 1730001 ◽  
Author(s):  
Hong-Li Chen ◽  
Xiao-Ning Jiao ◽  
Jin-Tao Zhou
Keyword(s):  
Mechanical Properties ◽  
Electrode Materials ◽  
Polyhedral Oligomeric Silsesquioxane ◽  
Lithium Ion ◽  
Proton Exchange ◽  
Hybrid Nanoparticles ◽  
Solid Polymer ◽  
Research Progress ◽  
Inorganic Hybrid ◽  
Oligomeric Silsesquioxane

Polyhedral oligomeric silsesquioxane (POSS) is a kind of organic–inorganic hybrid nanoparticle. This paper introduces the research progress of different kind of POSS organic–inorganic hybrid nanoparticles applied to lithium-ion batteries, fuel batteries, and supercapacitors by researchers on mechanical properties, thermal properties and electrochemistry properties. The results showed that the ionic conductivity of POSS/Li-ion solid polymer electrolyte reached 3.26[Formula: see text][Formula: see text][Formula: see text]10[Formula: see text][Formula: see text]S/cm and mechanical properties were commendable. The proton conductivity of POSS hybrid proton exchange membranes came to the level of 6.46[Formula: see text][Formula: see text][Formula: see text]10[Formula: see text][Formula: see text]S/cm and the mechanical strength was 18[Formula: see text]MPa with less content of POSS. With the inorganic core of POSS, smaller and more uniform multi-pore electrode materials offer a new idea on the fabrication of supercapacitor electrode materials.

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