Photoluminescence of Poly(P-Phenylene Vinylene) Encapsulated in Mesoporous Silica

1999 ◽  
Vol 558 ◽  
Author(s):  
Andras G. Pattantyus-Abraham ◽  
Michael O. Wolf
Keyword(s):  
Thermogravimetric Analysis ◽  
Mesoporous Silica ◽  
In Situ Polymerization ◽  
Nitrogen Adsorption ◽  
Phenylene Vinylene ◽  
Polymer Loading ◽  
Nitrogen Adsorption Isotherms ◽  
Spectrum Matching ◽  
Mcm 41

ABSTRACTThe preparation of poly(p-phenylene vinylene) (PPV) encapsulated in a mesoporous silica, MCM-41, is reported. In situ polymerization of xylylene bis(tetrahydrothiophenium chloride) yields a highly luminescent, yellow powder with a fluorescence spectrum matching that of unencapsulated PPV. Nitrogen adsorption isotherms show that the pore size of the PPV- loaded MCM-41 is significantly smaller than that of empty MCM-41 and a polymer loading of ca. 8% by weight is obtained by thermogravimetric analysis. Photoluminescence data for the encapsulated PPV are presented.

Photoluminescence of Poly(P-Phenylene Vinylene) encapsulated In Mesoporous Silica

1999 ◽  
Vol 560 ◽  
Author(s):  
Andras G. Pattantyus-Abraham ◽  
Michael O. Wolf
Keyword(s):  
Thermogravimetric Analysis ◽  
Mesoporous Silica ◽  
In Situ Polymerization ◽  
Nitrogen Adsorption ◽  
Phenylene Vinylene ◽  
Polymer Loading ◽  
Nitrogen Adsorption Isotherms ◽  
Spectrum Matching ◽  
Mcm 41

ABSTRACTThe preparation of poly(ρ-phenylene vinylene) (PPV) encapsulated in a mesoporous silica, MCM-41, is reported. In situ polymerization of xylylene bis(tetrahydrothiophenium chloride) yields a highly luminescent, yellow powder with a fluorescence spectrum matching that of unencapsulated PPV. Nitrogen adsorption isotherms show that the pore size of the PPVloaded MCM-41 is significantly smaller than that of empty MCM-41 and a polymer loading of ca. 8% by weight is obtained by thermogravimetric analysis. Photoluminescence data for the encapsulated PPV are presented.

Polycaprolactone/mesoporous silica MCM-41 composites prepared by in situ polymerization

Particuology ◽  
2017 ◽  
Vol 30 ◽  
pp. 135-143 ◽  
Author(s):  
Laura Lopez-Figueras ◽  
Nuria Navascues ◽  
Silvia Irusta
Keyword(s):  
Mesoporous Silica ◽  
In Situ Polymerization ◽  
Mcm 41

A study on the kinetics and thermal properties of polystyrene/diatomite nanocomposites prepared via in situ ATRP

2018 ◽  
Vol 33 (2) ◽  
pp. 180-197 ◽  
Author(s):  
Khezrollah Khezri ◽  
Yousef Fazli
Keyword(s):  
Molecular Weight ◽  
In Situ Polymerization ◽  
Structural Characteristics ◽  
Nitrogen Adsorption ◽  
Linear Increase ◽  
Size Exclusion ◽  
Scanning Calorimetry ◽  
Morphological Studies ◽  
Exclusion Chromatography

Pristine mesoporous diatomite was employed to prepare polystyrene/diatomite composites. Diatomite platelets were used for in situ polymerization of styrene by atom transfer radical polymerization to synthesize tailor-made polystyrene nanocomposites. X-Ray fluorescence spectrometer analysis and thermogravimetric analysis (TGA) were employed for evaluating some inherent properties of pristine diatomite platelets. Nitrogen adsorption/desorption isotherm is applied to examine surface area and structural characteristics of the diatomite platelets. Evaluation of pore size distribution and morphological studies were also performed by scanning and transmission electron microscopy. Conversion and molecular weight determinations were carried out using gas and size exclusion chromatography, respectively. Linear increase of ln ( M0/M) with time for all the samples shows that polymerization proceeds in a living manner. Addition of 3 wt% pristine mesoporous diatomite leads to an increase of conversion from 72% to 89%. Molecular weight of polystyrene chains increases from 11,326 g mol−1 to 14134 g mol−1 with the addition of 3 wt% pristine mesoporous diatomite; however, polydispersity index values increases from 1.13 to 1.38. Increasing thermal stability of the nanocomposites is demonstrated by TGA. Differential scanning calorimetry shows an increase in glass transition temperature from 81.9°C to 87.1°C by adding 3 wt% of mesoporous diatomite platelets.

Friction and Rheological Properties of Meso-Porous MCM-41/Unsaturated Polyester In Situ Composites

2014 ◽  
Vol 599-601 ◽  
pp. 18-21
Author(s):  
Shu Long Hu ◽  
Jian Lv ◽  
Feng Ying Lu ◽  
Hua Shan Liu ◽  
De Ming Zeng
Keyword(s):  
Wear Resistance ◽  
Rheological Properties ◽  
Cetyltrimethylammonium Bromide ◽  
Room Temperature ◽  
Polyester Resin ◽  
In Situ Polymerization ◽  
Unsaturated Polyester ◽  
Roller Milling ◽  
Mcm 41

In this paper, meso-porous MCM-41 was synthesized at room temperature using cationic surfactant cetyltrimethylammonium bromide (CTAB) as the template agent. Then MCM-41/unsatura-ted polyester resin (UPR) materials were prepared by in-situ polymerization with the meso-porous MCM-41. MCM-41/UPR in-situ composites were prepared by roller milling and molding processes. Effects of meso-porous MCM-41 on rheological properties and wear resistance of the MCM-41/UPR composites have been investigated. It is shown that MCM-41 has a diameter in range of 4-5 nm and the pores are highly ordered. MCM-41 can improve the rheological properties and wear resistance of the composites. When MCM-41 content is 2%, the mass abrasion loss is decreased by 37.4%.

Effective nitrosamines trap derived from the in situ carbonized mesoporous silica MCM-41

2010 ◽  
Vol 176 (1-3) ◽  
pp. 602-608 ◽  
Author(s):  
Jia Yuan Yang ◽  
Jing Yang ◽  
Yu Zhou ◽  
Wei Gang Lin ◽  
Hong Ji Wang ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Mcm 41

scholarly journals Preparation of Organic-Inorganic Hybrid Materials Based on MCM-41 and Its Applications

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Sana M. Alahmadi ◽  
Sharifah Mohamad ◽  
Mohd Jamil Maah
Keyword(s):  
Mesoporous Silica ◽  
Nitrogen Adsorption ◽  
Toluene Diisocyanate ◽  
Covalent Attachment ◽  
X Ray Diffraction ◽  
Channel System ◽  
Modification Process ◽  
Adsorption Analysis ◽  
The Fourier Transform ◽  
Mcm 41

This work reports the covalent attachment of three different calix[4]arenes (calix[4]arene (C4), p-sulfonatocalix[4]arene (C4S), and p-tert-butyl-calix[4]arene (PC4)) to MCM-41, using a three-step modification process. 3-Chloropropyltrimethoxysilane (ClPTS) was first attached to the mesoporous silica surface and subsequently converted to amides via the reaction with toluene diisocyanate (TDI). Finally, calix[4]arene derivatives attached to the isocyanate ending remained available on toluene di-iso-cyanate. Changes in the surface properties of the mesoporous silica caused by the chemical modification were monitored using the Fourier transform infrared spectroscopy (FTIR), thermal analysis (TGA), and elemental analysis. The FTIR spectra and TGA analysis verify that the calix[4]arene derivatives are covalently attached to the mesoporous silica. The preservation of the MCM-41 channel system was checked by the X-ray diffraction and nitrogen adsorption analysis. These materials were then used to evaluate the sorption properties of some organotins compounds (Tributyltin (TBT), Triphenyltin (TPT), and Dibutyltin (DBT)).

A Stand-Alone Mesoporous Crystal Structure Model from in situ X-ray Diffraction: Nitrogen Adsorption on 3 D Cagelike Mesoporous Silica SBA-16

2012 ◽  
Vol 18 (33) ◽  
pp. 10300-10311 ◽  
Author(s):  
Keiichi Miyasaka ◽  
Hiroko Hano ◽  
Yoshiki Kubota ◽  
Yangzheng Lin ◽  
Ryong Ryoo ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Mesoporous Silica ◽  
Nitrogen Adsorption ◽  
Structure Model ◽  
X Ray Diffraction ◽  
X Ray

Humidity sensors based on MCM-41/polypyrrole hybrid film via in-situ polymerization

2018 ◽  
Vol 277 ◽  
pp. 584-590 ◽  
Author(s):  
Rongrong Qi ◽  
Xiuzhu Lin ◽  
Jianxun Dai ◽  
Hongran Zhao ◽  
Sen Liu ◽  
...  
Keyword(s):  
Hybrid Film ◽  
In Situ Polymerization ◽  
Humidity Sensors ◽  
Mcm 41
Sign in / Sign up

Export Citation Format

Share Document