Preparation and Characterization of Octadecylated Poly(vinyl Alcohol) Polymers

2012 ◽  
Vol 482-484 ◽  
pp. 1921-1924 ◽  
Author(s):  
Li Juan Li ◽  
Hai Feng Shi ◽  
Xing Xiang Zhang
Keyword(s):  
Fourier Transform ◽  
Thermal Properties ◽  
Vinyl Alcohol ◽  
Phase Change Materials ◽  
Solid Phase ◽  
Poly Vinyl Alcohol ◽  
X Ray Diffraction ◽  
X Ray ◽  
Storage Properties

Octadecylated poly (vinyl alcohol) (PVA-C18) comb-like polymer was prepared through the reaction between PVA and 1-bromooctadecane via O-alkylation method. The structure, thermal properties and packing mode of PVA-C18 comb-like polymer were detailed investigated with Fourier transform infrared spectroscopy (FTIR), differential scanning calorimeter (DSC), and X-ray diffraction (XRD). The results show that octadecyl side chains had been successfully grafted onto PVA backbones, and PVA-C18 comb-like polymer exhibit the better thermal storage properties with enthalpy of 29.3kJ/mol , indicated that it is one kind of solid-solid phase change materials.

Hydroxyapatite Deposition by Alternate Soaking Technique on Poly (Vinyl Alcohol)-Coated Poly (ε-Caprolactone) (PCL) Substrate

2009 ◽  
Vol 610-613 ◽  
pp. 1137-1142 ◽  
Author(s):  
Ling Li Li ◽  
Guang Li ◽  
Jian Ming Jiang ◽  
Yue Wen Guo
Keyword(s):  
Fourier Transform ◽  
Aqueous Solutions ◽  
Vinyl Alcohol ◽  
Calcium Phosphates ◽  
Fourier Transform Infrared ◽  
Poly Vinyl Alcohol ◽  
X Ray Diffraction ◽  
X Ray ◽  
Deposition Amount ◽  
Surface Modified

Biomineralization on surface-modified poly (ε-caprolactone) (PCL) through an alternate soaking process was investigated. A poly(vinyl alcohol) (PVA)-coating on PCL substrate prepared by repetitive adsorption/ drying in an aqueous PVA solution could accelerate hydroxyapatite (HA) deposition while PVA-PCL soaked in aqueous solutions containing Ca2+ and PO3-4 ions alternately. Fourier transform infrared (FTIR) and X-ray diffraction of the apatite verified the formed hydroxyapatite in these processes exhibited a close resemblance with calcium phosphates (HA, Ca10(PO4)6(OH)2). It was also found that the amount of HA formed increased with both soaking with both soaking cycles and deposition amount of PVA on PCL. This study suggested that simple PVA coating on PCL substrate could serve as a novel way to accelerated HAP formation via alternating soaking.

Effect of Aluminum Source on the Structural and Thermal Properties of Partially Phosphorylated Polyvinyl Alcohol Composite (PPVA) - Aluminum Phosphate (PPVA-AlPO4) Nanocomposite

2016 ◽  
Vol 701 ◽  
pp. 291-294 ◽  
Author(s):  
Asmalina Mohamed Saat ◽  
Mohd Rafie Johan
Keyword(s):  
Thermal Properties ◽  
Polyvinyl Alcohol ◽  
Aluminum Hydroxide ◽  
Vinyl Alcohol ◽  
Aluminum Phosphate ◽  
Xrd Analysis ◽  
Aluminum Nitrate ◽  
Poly Vinyl Alcohol ◽  
X Ray Diffraction ◽  
X Ray

Partially phosphorylated poly vinyl alcohol (PPVA) was mixed with two different aluminum (Al) sources (aluminum nitrate and aluminum hydroxide) to produce a PPVA-AlPO4 composite. Transgravimetric analysis (TGA) shows that the weight residue of PPVA-AlPO4 composite using aluminum nitrate is higher than aluminum hydroxide. X-Ray diffraction (XRD) analysis shows the occurrence of multiple phases of PPVA-AlPO4 composite using aluminum nitrate and three broad peaks at range of 2-6, 6-18 and 24-36 ̊ using aluminum hydroxide.

Preparation and Characterization of Poly(Vinyl Alcohol) Nanofibers Containing ZnS Nanopaticles via Electrospinning

2007 ◽  
Vol 121-123 ◽  
pp. 641-644 ◽  
Author(s):  
H.Y. Wang ◽  
Yi Yang Zhao ◽  
Z.Y. Li ◽  
Xiao Feng Lu ◽  
C. Wang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
X Ray Diffraction ◽  
Electrospinning Technique ◽  
Violet Emission ◽  
X Ray ◽  
Transmission Electron ◽  
Spectroscopy Studies

Poly(vinyl alcohol) (PVA) nanofibers containing functional ZnS nanoparticles have been successfully prepared by electrospinning technique. The ZnS/PVA mixture solution for electrospinning was obtained by reacting Zn(Ac)2 with Na2S in the PVA aqueous solution. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD) analyses revealed that the morphology of the ZnS/PVA nanofibers consists of the dispersion of ZnS nanopaticles with cubic structure in PVA nanofibers. The coordinations between –OH and Zn2+ were characterized by infrared spectroscopy. The photoluminescence spectroscopy studies showed that the ZnS/PVA nanofibers had a strong blue-violet emission band at 450 nm, which may be associated with defect-related emission of the ZnS.

Fabrication and Characterization of Poly(Vinyl Alcohol)/Chitosan Blend Electrospun Nanofibrous Membrane

2016 ◽  
Vol 701 ◽  
pp. 265-269 ◽  
Author(s):  
Md Shariful Islam ◽  
Fayeka Mansura ◽  
Amalina Muhammad Afifi ◽  
Bee Chin Ang
Keyword(s):  
Vinyl Alcohol ◽  
Average Diameter ◽  
Electrospinning Process ◽  
Poly Vinyl Alcohol ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray ◽  
Fabrication And Characterization ◽  
The Ideal

In this study, poly (vinyl alcohol) / chitosan blend nanofibers were synthesized by electrospinning process in different polyvinyl alcohol and chitosan weight ratios. The nanofibers were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR) and X-ray diffraction (XRD). SEM images showed that, 50:50 poly vinyl alcohol/chitosan blend was the ideal ratio for producing beadless nanofiber. The average diameter of the beadless nanofiber was found to be 123 nm. FTIR and XRD results demonstrated the presence of intermolecular hydrogen bonding between the molecules of poly vinyl alcohol and chitosan.

Study on thermal properties of poly(vinyl alcohol) and polyurethane composites with multiwalled carbon nanotubes/silica nanohybrids

2016 ◽  
Vol 30 (3) ◽  
pp. 404-415 ◽  
Author(s):  
Hongyan Xie ◽  
Qing Ye ◽  
Jin Liu ◽  
Guanglian Zhou ◽  
Wei Liu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Properties ◽  
Multiwalled Carbon Nanotubes ◽  
Vinyl Alcohol ◽  
Sol Gel ◽  
Poly Vinyl Alcohol ◽  
X Ray Diffraction ◽  
Multiwalled Carbon ◽  
Polyurethane Composites

Two kinds of multiwalled carbon nanotubes/silica nanohybrids (CNTs/SiO2) were synthesized via a sol–gel method by coating SiO2 on the surfaces of CNTs that had been functionalized with poly(sodium- p-styrenesulfonate) (PSS). The influence of the nanohybrids on the thermal properties of poly(vinyl alcohol) (PVA) and polyurethane (PU) composites was investigated. Characterization of CNTs/SiO2 nanohybrids, elucidated with scanning electron microscopy and X-ray diffraction, showed that PSS played a key role in the final morphology and resulted in a “core/shell” and “candied haws on a stick”-like structure. The thermal degradation and thermo-oxidation of PVA and PU composites evaluated by thermogravimetic analyses suggested that the thermal properties of PVA/(CNTs/SiO2) composites were improved at relative high temperature range when compared with pure PVA, and the improvement mainly depended on the loading fraction of the nanohybrids, while for PU/(CNTs/SiO2) composites, a small fraction of the nanohybrids increased the materials thermal properties, but the improvements were influenced by the type of CNTs/SiO2 nanohybrids.

Synthesis and Characterization of Y2O3 Nanoflowers

2012 ◽  
Vol 465 ◽  
pp. 76-79 ◽  
Author(s):  
Shuang Zhan ◽  
Xia Li
Keyword(s):  
Fourier Transform ◽  
Phase Composition ◽  
Electron Microscope ◽  
Synthesis And Characterization ◽  
The Novel ◽  
X Ray Diffraction ◽  
Facile Hydrothermal Method ◽  
X Ray ◽  
Scanning Electron

The novel Y2O3 nanoflowers were synthesized through a facile hydrothermal method without using any catalyst or template. The phase composition and the microstructure of as-prepared products were characterized by field emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD) as well as Fourier transform infrared spectrum. The formation mechanism for the Y2O3 flowers has been proposed.

Bulk and surface characterization of cellulose/poly(vinyl alcohol) blends by Fourier-transform infra-red spectroscopy

Polymer ◽  
1991 ◽  
Vol 32 (6) ◽  
pp. 1010-1016 ◽  
Author(s):  
Mitsuhiro Shibayama ◽  
Tomoyuki Yamamoto ◽  
Chang-Fa Xiao ◽  
Shinichi Sakurai ◽  
Akira Hayami ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Vinyl Alcohol ◽  
Surface Characterization ◽  
Poly Vinyl Alcohol ◽  
Infra Red

Mechanochemical Synthesis of Magnesium Doped Hydroxyapatite: Powder Characterization

2013 ◽  
Vol 372 ◽  
pp. 62-65 ◽  
Author(s):  
Sharifah Adzila ◽  
Singh Ramesh ◽  
Iis Sopyan ◽  
C.Y. Tan ◽  
Mohd. Hamdi ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Present Method ◽  
X Ray Diffraction ◽  
Mechanochemical Method ◽  
Xrd Pattern ◽  
X Ray ◽  
Hydroxyapatite Powder ◽  
Powder Properties ◽  
Mg Doped

In this study, the mechanochemical method was employed to synthesize hydroxyapatite (HA) and magnesium (Mg) doped hydroxyapatite (HA) powders. The effect of Mg2+ into the synthesized HA powder properties were investigated. Characterization of the synthesized HA and Mg doped HA at various concentrations (1% - 5% MgHA) were accomplished through X-ray diffraction (XRD) and Fourier transform infrared (FTIR) analyses. nanosize of HA and Mg doped HA powders were successfully synthesized through the present method as indicated from the different peaks intensity and adsorption bands obtained in XRD pattern and FTIR respectively.

Characterization of clays and the technology of Roman ceramics production

Clay Minerals ◽  
2018 ◽  
Vol 53 (3) ◽  
pp. 413-429 ◽  
Author(s):  
Letizia Ceccarelli ◽  
Maurizio Pietro Bellotto ◽  
Marco Caruso ◽  
Cinzia Cristiani ◽  
Giovanni Dotelli ◽  
...  
Keyword(s):  
Fourier Transform ◽  
First Century ◽  
X Ray Diffraction ◽  
Local Clay ◽  
X Ray ◽  
Ancient Technology ◽  
Differential Thermogravimetric Analysis ◽  
The Rich ◽  
Clay Materials

ABSTRACTThe recent discovery of a Roman ceramics manufacturing workshop at Montelabate (Perugia, Italy), in use from the first century BC until the late-fourth to fifth centuries AD, offers a unique opportunity to study the technical processes for producing Roman amphorae. Ancient and modern clays were sampled and analysed; they do not differ significantly, supporting the hypothesis of the exploitation of the rich local clay source that allowed a continuity of production. Characterization of the clays was performed using geotechnical methods (Atterberg limits and size distribution) and by thermogravimetric and differential thermogravimetric analysis, Fourier-transform infrared spectroscopy, X-ray diffraction and X-ray fluorescence analyses. The material was suitable for pottery making with the addition of calcite and quartz sand temper. Production waste and discarded materials as well as good-quality products were also analysed with the same methodology. It is therefore possible to reconstruct the ancient technology by defining the recipe for the production of the amphorae and their firing temperature on the basis of the decomposition of clay materials and the presence of newly formed minerals.

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