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.

scholarly journals Preparation and characterization of polyhedral oligomeric silsesquioxane/polystyrene nanocomposites

e-Polymers ◽  
2012 ◽  
Vol 12 (1) ◽  
Author(s):  
Benhong Yang ◽  
Meng Li ◽  
Yun Wu ◽  
Kang Wang
Keyword(s):  
Thermal Stability ◽  
Thermal Property ◽  
Polyhedral Oligomeric Silsesquioxane ◽  
29Si Nmr ◽  
Solution Blending ◽  
Oligomeric Silsesquioxane ◽  
Tga And Dsc ◽  
Thermal Stability Of

AbstractSeveral inorganic/organic nanocomposites were prepared via solution-blending of cage-like octahexyl-polyhedral oligomeric silsesquioxane (Oh-POSS) with polystyrene (PS) in THF solvent. FTIR and 29Si-NMR were employed to characterize the structures of the nanocomposites. SEM pictures showed that the sample films were smooth and no POSS aggregation was observed when POSS content was lower than 1.0 wt%. TGA and DSC were used to investigate the thermal property. The results showed that the incorporation of nanosized Oh-POSS enhanced the thermal stability of PS with low POSS content. When 1.0 wt% of Oh-POSS was incorporated into PS matrix, the Tg and Td increased by 7.7 °C and 8.2 °C, respectively. However, higher POSS contents (>1.0 wt%) would deteriorate the thermal property of the nanocomposites due to the severe congregation of POSS..

Thermal and Mechanical Properties of Poly(methyl methacrylate) Nanocomposites Containing Polyhedral Oligomeric Silsesquioxane

2012 ◽  
Vol 557-559 ◽  
pp. 304-308 ◽  
Author(s):  
Chun Bao Zhao ◽  
Xin Wang ◽  
Xu Jie Yang ◽  
Wei Zhao
Keyword(s):  
Mechanical Properties ◽  
Methyl Methacrylate ◽  
Polyhedral Oligomeric Silsesquioxane ◽  
Bulk Polymerization ◽  
Thermal And Mechanical Properties ◽  
X Ray Diffraction ◽  
Poly Methyl Methacrylate ◽  
Pmma Matrix ◽  
Transmission Electron ◽  
Oligomeric Silsesquioxane

A series of poly(methyl methacrylate) (PMMA) composites containing polyhedral oligomeric silsesquioxane (POSS) were produced by bulk polymerization. The morphology, thermal and mechanical properties of the composites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), thermogravimetric analyses (TGA) and dynamic mechanical analyses (DMA). Results show that the octa(3-chloropropyl)-POSS (ocp-POSS) and trisilanolphenyl-POSS (triol-POSS) have high compatibility with PMMA and can be uniformly dispersed into PMMA matrix. The separate incorporation of these two types of POSS contributes to the improvement of thermal stability of PMMA composites. When the content of POSS was 7.5 wt%, the thermal decomposition temperatures (5% mass loss) of PMMA composites with ocp-POSS and triol-POSS were increased by about 104 °C and 130 °C, respectively. The increase of triol-POSS content in the PMMA matrix gave slight enhanced storage modulus before glass transition.

scholarly journals The Use of POSS-Based Nanoadditives for Cable-Grade PVC: Effects on its Thermal Stability

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1105 ◽  
Author(s):  
Palin ◽  
Rombolà ◽  
Milanesio ◽  
Boccaleri
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Thermogravimetric Analysis ◽  
Thermal Degradation ◽  
Additive Effects ◽  
Poly Vinyl Chloride ◽  
The Family ◽  
Mechanical Performances ◽  
Oligomeric Silsesquioxane ◽  
Thermal Stability Of

Plasticized–Poly(vinyl chloride) (P-PVC) for cables and insulation requires performances related to outdoor, indoor and submarine contexts and reduction of noxious release of HCl-containing fumes in case of thermal degradation or fire. Introducing suitable nanomaterials in polymer-based nanocomposites can be an answer to this clue. In this work, an industry-compliant cable-grade P-PVC formulation was added with nanostructured materials belonging to the family of Polyhedral Oligomeric Silsesquioxane (POSS). The effects of the nanomaterials, alone and in synergy with HCl scavenging agents as zeolites and hydrotalcites, on the thermal stability and HCl evolution of P-PVC were deeply investigated by thermogravimetric analysis and reference ASTM methods. Moreover, hardness and mechanical properties were studied in order to highlight the effects of these additives in the perspective of final industrial uses. The data demonstrated relevant improvements in the thermal stability of the samples added with nanomaterials, already with concentrations of POSS down to 0.31 phr and interesting additive effects of POSS with zeolites and hydrotalcites for HCl release reduction without losing mechanical performances.

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.

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