Synthesis and Characterization of Temperature-Sensitive TSPU/PNIPAAm Semi-IPN Polymer

2011 ◽  
Vol 399-401 ◽  
pp. 359-362 ◽  
Author(s):  
Yi Chun Wang ◽  
Zheng Wei Dai ◽  
Yuan Xue
Keyword(s):  
Chemical Structure ◽  
In Situ Polymerization ◽  
Phenyl Isocyanate ◽  
Chain Extender ◽  
Synthesis And Characterization ◽  
Temperature Sensitive ◽  
Sensitive Material ◽  
Ft Ir

Thermo-sensitive polyurethane (TSPU) was synthesized from poly(ε-caprolactone) and 4,4’-methylenebis (phenyl isocyanate) by a two-step process with 1,4-butanediol as the chain extender. Following that, a novel temperature-sensitive material was created by the strategy of IPN from TSPU and PNIPAAm in the method of in situ polymerization. The chemical structure and thermo properties of the semi-IPN were characterized with FT-IR and DSC. The results prove that intensive inter-molecular interactions exist between TSPU and PNIPAAm chains, which have significant influence on the phase transition behaviors of the material. According to these results, the transition temperature of the semi-IPN can be adjusted in the range of 30~40 °C by controlling the composition of TSPU and the semi-IPNs.

Synthesis and Characterization of the PANI/ITO Conducting Nanocomposites

2010 ◽  
Vol 663-665 ◽  
pp. 542-545 ◽  
Author(s):  
Bing Jie Zhu ◽  
Xin Wei Wang ◽  
Mei Fang Zhu ◽  
Qing Hong Zhang ◽  
Yao Gang Li ◽  
...  
Keyword(s):  
Doping Concentration ◽  
In Situ Polymerization ◽  
Synthesis And Characterization ◽  
Conductivity Measurements ◽  
X Ray Diffraction ◽  
X Ray ◽  
Maximum Conductivity ◽  
Scanning Electron

The PANI/ITO conducting nanocomposites have been synthesized by in-situ polymerization. The obtained nanocomposites were characterized by X-ray diffraction pattern, scanning electron microscopy and Fourier transform infrared. Electrical conductivity measurements on the samples pressed into pellets showed that the maximum conductivity attained 2.0 ± 0.05 S/cm for PANI/ITO nanocomposites, at ITO doping concentration of 10 wt%. The results of the present work may provide a simple, rapid and efficient approach for preparing PANI/ITO nanocomposites.

Study on the Synthesis and Characterization of PANi/Nano-CeO2 Composites

2007 ◽  
Vol 124-126 ◽  
pp. 287-290 ◽  
Author(s):  
Fei Liu ◽  
Yong Jun He ◽  
Jeung Soo Huh
Keyword(s):  
In Situ Polymerization ◽  
Solid Phase ◽  
Polymerization Reaction ◽  
Solid Phase Reaction ◽  
Phase Reaction ◽  
Vis Spectroscopy ◽  
Ft Ir ◽  
Average Size

The nano-CeO2 was synthesized by two-step solid-phase reaction. The image of TEM showed that nano-CeO2 with an average size of about 70 nm. The series of polyaniline/nano-CeO2 composites with different PANi: CeO2 ratios were prepared by in-situ polymerization in the presence of hydrochloric acid (HCl) as dopant by adding nano-CeO2 into the polymerization reaction mixture of aniline. The composites obtained were characterized by FT-IR and UV-vis spectroscopy analysis. The FT-IR spectra of nanocomposites indicate different blue-shifts, attributed to C–N stretching mode for benzenoid unit. The UV-vis spectra of nanocomposites display einstein-shifts compared with PANi at 620nm. The conductivity properties of the composites are also changed compare to the pure PANi. These results suggest that the interactions between the polymer matrix and nanoparticles take place in polyaniline/nano- CeO2 composites.

Synthesis and characterization of multi-walled carbon nanotubes reinforced polyamide 6 via in situ polymerization

Polymer ◽  
2005 ◽  
Vol 46 (14) ◽  
pp. 5125-5132 ◽  
Author(s):  
Chungui Zhao ◽  
Guanjun Hu ◽  
Ryan Justice ◽  
Dale W. Schaefer ◽  
Shimin Zhang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
In Situ Polymerization ◽  
Polyamide 6 ◽  
Synthesis And Characterization ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Synthesis and characterization of composite polysulfone membranes for desalination in nanofiltration technique

2010 ◽  
Vol 62 (11) ◽  
pp. 2655-2663 ◽  
Author(s):  
A. Akbari ◽  
M. Homayonfal ◽  
V. Jabbari
Keyword(s):  
Acrylic Acid ◽  
Polyacrylic Acid ◽  
Graft Polymerization ◽  
Irradiation Time ◽  
Polymerization Process ◽  
Synthesis And Characterization ◽  
Porous Support ◽  
Ft Ir

Composite nanofiltration (NF) membrane was developed polyacrylic acid (PAA) in situ UV graft polymerization process using ultrafiltration (UF) polysulfone (PSF) membrane as porous support. FT-IR spectra indicated that grafting was performed and it show peaks at 1,732 cm−1 and 3,396 cm−1 region for CO and OH starching bond of acrylic acid (AA) monomer, respectively. AFM microscopy showed the roughness of surface was reduced by increase of UV irradiation times. Effect of irradiation time on the grafting of acrylic acid (AA) in the same concentration was discussed. The salts rejection increase was accompanied with grafting of polysulfone (PSF) ultrafiltration (UF) membrane. The rejection of Na2SO4, MgSO4, NaCl and CaCl2 salts by PSF-grafted-PAA nanofiltration (NF) membrane was in 98, 60, 52 and 30% respectively, under 0.3 MPa.

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