Research on the Reaction Condition and Process of Microcapsules via In Situ Polymerization

2011 ◽  
Vol 224 ◽  
pp. 99-103 ◽  
Author(s):  
Chang Zheng Xin ◽  
Li Na Wang ◽  
Yan Wei Wang ◽  
Xiang An Huang
Keyword(s):  
Electron Microscopy ◽  
Phase Change Materials ◽  
In Situ Polymerization ◽  
Influence Factors ◽  
Average Diameter ◽  
Optical Microscope ◽  
Curing Temperature ◽  
The Core ◽  
Microencapsulated Phase Change Materials

Heat-resistant microencapsulated phase change materials (MPCMs) were prepared via in-situ polymerization, with polyurea used as the shell and low melt-point paraffin wax as the core. Optical microscope and Electron microscopy were employed to evaluate the properties and morphology of the materials. The influence factors on polymerization were discussed. Experimental results indicated that the average diameter of 2.5 μm of particles was gained when the emulsification content was 1%, the time of acidification was 60 minutes and the curing temperature was 70°C.

Preparation of Polyaniline @ Polypyrrole Conductive Composite via In Situ Polymerization

2013 ◽  
Vol 562-565 ◽  
pp. 1137-1142
Author(s):  
Hui Xia Feng ◽  
Bing Wang ◽  
Lin Tan ◽  
Na Li Chen
Keyword(s):  
Electron Microscopy ◽  
Electrical Conductivity ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
In Situ Polymerization ◽  
Conductive Composite ◽  
The Core ◽  
Novel Method ◽  
Scanning Electron

We prepared the polyaniline@polypyrrole (PAn@PPy) conductive composite by a novel method. The struction like Pre-prepared PAn as the core and PPy as the shell for the composite has been prepared by in-situ polymerization. The PAn@PPy conductive composite presents an electrical conductivity of 12.5 S/cm, which is much higher than pure PAn. The synthesized polymer composites are characterized by Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and Thermogravimetric analysis (TG). The results indicated that PPy successfully grafted on PAn and the heat resistance of nanocomposite is remarkably increased.

Fabrication of Thermochromatic Microencapsulated Phase Change Materials

2011 ◽  
Vol 332-334 ◽  
pp. 1856-1859
Author(s):  
Xiao Hua Liao ◽  
Hai Feng Shi ◽  
Nan Song ◽  
Xing Xiang Zhang
Keyword(s):  
Molecular Structure ◽  
Differential Scanning Calorimetry ◽  
Chemical Structure ◽  
Phase Change Materials ◽  
In Situ Polymerization ◽  
Melamine Formaldehyde ◽  
Scanning Calorimetry ◽  
Microencapsulated Phase Change Materials ◽  
Structure Properties

Microencapsulated n-octadecane (MicroC18) and doped with thermochromatic powders (TC-MicroC18) were prepared with melamine-formaldehyde (M-F) resin as the wall via in-situ polymerization. The chemical structure and thermal behavior of microcapsules were investigated using fourier transform infrared spectroscopy (FTIR), and differential scanning calorimetry (DSC). Experimental results show that 63 wt% n-C18 has been incorporated into microcapsules, and the obvious thermochromatic effect of TC-MicroC18 is displayed with temperature changing. The structure-properties of TC-MicroC18 also is discussed in detail from the aspect of molecular structure.

scholarly journals A New Synthesis Route to Prepare Polyaniline (PANI) Nanotubes Containing Magnetic Nanoparticles

2008 ◽  
Vol 54 ◽  
pp. 325-330 ◽  
Author(s):  
Ana Claudia V. De Araújo ◽  
S. Alves ◽  
W.M. Azevedo
Keyword(s):  
Electron Microscopy ◽  
Fe3o4 Nanoparticles ◽  
In Situ Polymerization ◽  
Average Diameter ◽  
Transmission Electron ◽  
New Synthesis ◽  
Co Precipitation ◽  
Tubular Morphology

In this work we report the preparation and characterization of a polyaniline/magnetite (PANI)-Fe3O4 nanocomposite, with average diameter around 50 nm and tubular morphology. The tubular nanocomposite was synthesized by an in situ polymerization of aniline using Fe3O4 nanoparticles as an oxidant agent. The Fe3O4 nanoparticles with narrow size distribution were synthesized by co-precipitation technique and the products were characterized by powder X-ray diffractometry (XRD), Fourier transform infrared (FTIR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM).

Fabrication and Properties of Microencapsulated-Paraffin/Gypsum-Matrix Building Materials for Thermal Energy Storage

2012 ◽  
Vol 427 ◽  
pp. 45-50 ◽  
Author(s):  
Jun Feng Su ◽  
Sheng Bao Wang
Keyword(s):  
Phase Change ◽  
Building Materials ◽  
Phase Change Materials ◽  
In Situ Polymerization ◽  
Core Material ◽  
Shell Material ◽  
Cycling Treatment ◽  
Energy Needs ◽  
Microencapsulated Phase Change Materials

Microencapsulated phase change materials (microPCMs) contain paraffin was fabricated by in-situ polymerization using methanol-modified melamine-formaldehyde (MMF) as shell material. The shell of microPCMs was sooth and compact with global shape, its thickness was not greatly affected by the core/shell ratio and emulsion stirring rate. More shell material in microPCMs could enhance the thermal stability and provide higher compact condition for core material. After a 100-times thermal cycling treatment, the microPCMs contain paraffin also nearly did not change the phase change behaviors of PCM. With the increasing of weight contents of microPCMs in gypsum board, the thermal conductivity (λ) values of composites had decreased. The simulation of temperature tests proved that the microPCMs/gypsum composite could store the time-dependent and intermittent solar energy, which did not necessarily meet the energy needs for space heating at all times.

Preparation and Characterization of Hexadecane Microcapsule Phase Change Materials by In Situ Polymerization

2013 ◽  
Vol 815 ◽  
pp. 367-370 ◽  
Author(s):  
Xiao Qiu Song ◽  
Yue Xia Li ◽  
Jing Wen Wang
Keyword(s):  
Particle Size ◽  
Phase Change ◽  
Phase Change Materials ◽  
In Situ Polymerization ◽  
Urea Formaldehyde ◽  
Agitation Speed ◽  
Urea Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Mass Ratio

Hexadecane microcapsule phase change materials were prepared by the in-situ polymerization method using hexadecane as core materials, urea-formaldehyde resin and urea-formaldehyde resin modified with melamine as shell materials respectively. Effect of melamine on the properties of microcapsules was studied by FTIR, biomicroscopy (UBM), TGA and HPLC. The influences of system concentration, agitation speed and mass ratio of wall to core were also investigated. The results indicated that hexadecane was successfully coated by the two types of shell materials. The addition of melamine into the urea-formaldehyde resin microcapsule reduced microcapsule particle size and microencapsulation efficiency. The influences of factors such as system concentration, agitation speed and mass ratio of wall to core to different wall materials microcapsules presented different variety trends of the microcapsule particle size.

Antifungal Effectiveness of Nanosilver Colloid against Rose Powdery Mildew in Greenhouses

2008 ◽  
Vol 135 ◽  
pp. 15-18 ◽  
Author(s):  
Hae Sic Kim ◽  
Hyun Suk Kang ◽  
Gyo Jin Chu ◽  
Hong Sik Byun
Keyword(s):  
Electron Microscopy ◽  
Powdery Mildew ◽  
Colloidal Solution ◽  
Physical Method ◽  
Average Diameter ◽  
Optical Microscope ◽  
Size Analysis ◽  
Large Area ◽  
Transmission Electron ◽  
Antifungal Effects

The antifungal effectiveness against rose powdery mildew using antimicrobial nanosilver colloidal solution was investigated. Double-capsulized nanosilver was prepared by chemical reaction of silver ion with aid of physical method, reducing agent and stabilizers. The average diameter of nanosilver was about 1.5 nm. They were highly stable and very well dispersive in aqueous solution. The Transmission electron microscopy and UV-vis spectrometer were used for measurements of size analysis and their stability, respectively. The nanosilver colloidal solution of concentration of 5000 ppm was diluted in 10 ppm of 500 kg and sprayed at large area of 3306 m2polluted by rose powdery mildew. The white rose powdery mildew fade out above 95 % after 2 days and was not recurred for a week. The antifungal effects were observed by an optical microscope and photographs.

Morphology of Polyethylene/Montmorillonite Nanocomposites Prepared by In Situ Polymerization

2013 ◽  
Vol 457-458 ◽  
pp. 244-247
Author(s):  
Min Li ◽  
Li Guang Xiao ◽  
Hong Kai Zhao
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
In Situ Polymerization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Reflection Peak ◽  
Basal Reflection ◽  
Scanning Electron

Polyethylene/montmorillonite (PE/MMT) nanocomposites were prepared by in situ polymerization. The morphology of MMT/MgCl2/TiCl4 catalyst and PE/MMT nanocomposites was investigated by scanning electron microscopy (SEM). It can be seen that MMT/MgCl2/TiCl4 catalyst remained the original MMT sheet structures and many holes were found in MMT and the morphology of PE/MMT nanocomposites is part of the sheet in the form of existence, as most of the petal structure. X-ray diffraction (XRD) and transmission electron microscopy (TEM) were carried out to characterize all the samples. XRD results reveal that the original basal reflection peak of PEI1 and PEI2 disappears completely and that of PEI3 become very weak. MMT/MgCl2/TiCl4 catalyst was finely dispersed in the PE matrix. Instead of being individually dispersed, most layers were found in thin stacks comprising several swollen layers.

In Situ Fabrication of Nanoscale Graphene Oxide/Polyaniline Composite and its Electrochemical Properties

2010 ◽  
Vol 148-149 ◽  
pp. 1547-1550 ◽  
Author(s):  
Hua Lan Wang ◽  
Qing Li Hao ◽  
Xi Feng Xia ◽  
Zhi Jia Wang ◽  
Jiao Tian ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
In Situ Polymerization ◽  
Ammonium Persulfate ◽  
Polymerization Process ◽  
Electrochemical Test ◽  
X Ray ◽  
Transmission Electron

A graphene oxide/polyaniline composite was synthesized by an in situ polymerization process. This product was simply prepared in an ethylene glycol medium, using ammonium persulfate as oxidant in ice bath. The composite was characterized by field emission scanning electron microscopy, transmission electron microscopy, X-Ray photoelectron spectroscopy, Raman spectroscopy and electrochemical test. The composite material showed a good electrochemical performance.

scholarly journals Functionality of TERGO Powders during the Synthesis of PANI-Based Composites for Electrical Devices

2019 ◽  
Vol 2019 ◽  
pp. 1-17
Author(s):  
M. A. Domínguez-Crespo ◽  
A. B. López-Oyama ◽  
A. M. Torres-Huerta ◽  
A. R. Hernández-Basilio ◽  
D. Palma-Ramírez ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Fine Particles ◽  
In Situ Polymerization ◽  
Hybrid Composites ◽  
Physical Interaction ◽  
Step Potential ◽  
Transmission Electron ◽  
Electrochemically Reduced Graphene Oxide ◽  
One Step

In this work, hybrid composites were prepared using polyaniline (PANI) and electrochemically reduced graphene oxide (ERGO) by in situ polymerization. ERGO powders were obtained by a two-way route, Hummer’s method, and one-step potential (−2 V) followed by annealing process at 400°C (TERGO powders): different quantities of TERGO fine particles (10, 20, and 30 wt%) were added to the in situ PANI polymerization in order to produce the hybrid composites. The morphology and structure of the PANI/TERGO compounds were characterized by Raman spectroscopy, ultraviolet-visible spectroscopy (UV-Vis), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Thermal treatment of ERGO powders pointed out high-defect surfaces with a wrinkle-type morphology (ID/IG ratio~0.90). The emeraldine phase of PANI was obtained with a maximum value of 61%, which decreases with the amount of TERGO powders. It is also seen that composites displayed a combined morphology between PANI matrix and TERGO powders, confirming a physical interaction between both morphologies. The amount of TERGO particles into the polymeric matrix also modifies the sample microstructure from a semispherical shape to extend sheets, where PANI is sandwiched between TERGO layers. Electrical conductivity of composites slightly increases independent of the TERGO amount (30 S/m and 39 S/m) due to the rough TERGO surface that conditioned the homogeneous nucleation of a large amount of polymer (PANI) reducing the area to move the electrical charge.

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