Synthesis and Properties of Poly(Vinyl Alcohol)/Calcium Aluminate Nanocomposites

1991 ◽  
Vol 245 ◽  
Author(s):  
Phillip B. Messersmith ◽  
Samuel I. Stupp
Keyword(s):  
Calcium Aluminate ◽  
Vinyl Alcohol ◽  
Organic Polymer ◽  
Poly Vinyl Alcohol ◽  
Structure And Properties ◽  
X Ray Diffraction ◽  
Layer Spacing ◽  
X Ray ◽  
New Class ◽  
Cementitious Systems

ABSTRACTThis paper describes the synthesis, structure and properties of a new layered nanocomposite which may have applications in cementitious systems. This material is one example of a new class of materials which consist of inorganic crystals containing intercalated organic polymer. The nanocomposite is synthesized by precipitating Ca2Al(OH)6[X]·nH2O (X=OH−, CO3−2) in the presence of poly(vinyl alcohol) (PVA). X-ray diffraction analysis indicates that the nanocomposite consists of calcium aluminate layers separated by interlayers containing anions, water and PVA. The intercalation of PVA can only be accomplished during crystal growth and is accompanied by an expansion in layer spacing from ˜8 Å to ˜18 Å. The nanocomposite exhibited enhanced thermal stability and when compacted into a cylinder was found to have more than twice the compressive strength than the pure calcium aluminate.

Study on Biomineralization of Poly (Vinyl Alcohol) Film via a Biomimetic Process

2009 ◽  
Vol 610-613 ◽  
pp. 1090-1095
Author(s):  
Yue Wen Guo ◽  
Ling Li Li ◽  
Guang Li ◽  
Jian Ming Jiang
Keyword(s):  
Electron Microscopy ◽  
Tissue Regeneration ◽  
Vinyl Alcohol ◽  
Bone Substitute ◽  
Bone Tissue Regeneration ◽  
Organic Polymer ◽  
Poly Vinyl Alcohol ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

Organic polymer–hydroxyapatite (HA) hybrid was expected as a promising bone substitute. In this work, poly(vinyl alcohol) (PVA) was used as a polymer substrate and the PVA-HA hybrid was prepared by a biomimetic process. The resultant PVA-HA composites were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis and scanning electron microscopy. It was found that HA could deposite on PVA surface when PVA soaked in water for a little swelling and then was carried out CaP treatment previously. The formed HA showed bone-like structure and had a good interaction with PVA substrate. The resultant hybrid might exhibit good osteoconductivity and biocompatibility, and could be expected as a useful scaffold for bone tissue regeneration.

Effect of syndiotacticity on the aqueous poly(vinyl alcohol) gel 4. X-ray diffraction analysis of gel

1976 ◽  
Vol 254 (11) ◽  
pp. 982-988 ◽  
Author(s):  
K. Ogasawara ◽  
T. Nakajima ◽  
K. Yamaura ◽  
S. Matsuzawa
Keyword(s):  
Diffraction Analysis ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
X Ray Diffraction ◽  
X Ray

scholarly journals The plasticizing effect of properties of manganous chloride and glycerin on poly(vinyl alcohol)

2015 ◽  
Vol 17 (2) ◽  
pp. 29-33
Author(s):  
Puyou Jia ◽  
Meng Zhang ◽  
Caiying Bo ◽  
Lihong Hu ◽  
Yonghong Zhou
Keyword(s):  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Thermal And Mechanical Properties ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Elongation At Break ◽  
X Ray ◽  
Ft Ir ◽  
Micro Morphology ◽  
Lower Tensile Strength

Abstract Poly(vinyl alcohol) films were prepared with manganous chloride (MnCl2 · 4H2O) and glycerin as complex plasticizer. The micro morphology of pure PVA film and complex plasticizer plasticized PVA films was observed by scanning electron microscope (SEM). The interaction between complex plasticizer and PVA molecules was investigated by Fourier transform infrared spectroscopy (FT-IR). The influence of complex plasticizer on crystalline, thermal and mechanical properties of PVA films was studied by X-ray diffraction (XRD), differential scanning calorimetry (DSC), thermogravimetric analysis (TG), and tensile testing, respectively. The results showed that the complex plasticizer of MnCl2 · 4H2O/glycerin could interacted with PVA molecular and then effectively destroy the crystals of PVA. PVA films plasticized with complex plasticizer of MnCl2 · 4H2O/glycerin became soft and ductile, with lower tensile strength and higher elongation at break compared with PVA films. This is an important cause of plasticization of the complex plasticizer of MnCl2 · 4H2O/glycerin on PVA films.

scholarly journals Electrically Conductive Nanocomposites Polymer of Poly(Vinyl Alcohol)/Glutaraldehyde/Multiwalled Carbon Nanotubes: Preparation and Characterization

2018 ◽  
Vol 18 (3) ◽  
pp. 383 ◽  
Author(s):  
Fitri Khoerunnisa ◽  
Hendrawan Hendrawan ◽  
Yaya Sonjaya ◽  
Rizki Deli Hasanah
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Polymer Matrix ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
X Ray Diffraction ◽  
Multiwalled Carbon ◽  
Electrically Conductive ◽  
X Ray ◽  
Conductive Nanocomposites

Electrically conductive nanocomposites polymer of poly(vinyl alcohol)/PVA, glutaraldehyde (GA) and multiwalled carbon nanotubes (MWCNT) has been successfully synthesized. The polymer nanocomposites were prepared by mixing PVA, GA (crosslinker), and MWCNT dispersion with an aid of ultrasonic homogenizer at 50 °C. The content of MWCNT, in particular, was varied in order to determine the effect of MWCNT on electrical conductivity of polymer composites. The polymer mixture was casted into a disc to obtain thin film. The electrical conductivity, surface morphology, and mechanical properties of the composites film were investigated by means of four probes method, FTIR spectroscopy, X-ray diffraction, SEM, AFM, and tensile strength measurement, respectively. It was found that the optimum composition of PVA (10%): GA (1%): MWCNT (1%) was 20:20:3 in volume ratio. The addition of MWCNT induced the electrically conductive network on polymer matrix where the electrical conductivity of nanocomposites film significantly increased up to 8.28 x 10-2 S/sq due to reduction of the contact resistance between conductive filler. Additionally, the mechanical strength of nanocomposites polymer were significantly increased as a result of MWCNT addition. Modification of morphological structure of composite film as indicated by FTIR spectra, X-ray diffraction patterns, SEM, and AFM images verified the effective MWCNT filler network in the polymer matrix.

scholarly journals Synthesis of Silver Nanoparticles from Mimusops elengi Extract of Raw Fruits and Characterization of PVA-Silver Polymer Nanocomposite Films

2021 ◽  
Vol 33 (4) ◽  
pp. 762-766
Author(s):  
BHABANI SHANKAR PANDA ◽  
MOHAMMED ANSAR AHEMAD
Keyword(s):  
Silver Nanoparticles ◽  
Vinyl Alcohol ◽  
Thermal Studies ◽  
Polymer Nanocomposite ◽  
Nanocomposite Films ◽  
Poly Vinyl Alcohol ◽  
X Ray Diffraction ◽  
X Ray ◽  
Uv Visible ◽  
Mimusops Elengi

The present work concerns on the synthesis of silver nanoparticles at 25 ºC using raw fruits extract of Bakul (Mimusops elengi) tree via chemical reduction route development of poly(vinyl alcohol) PVA-silver polymer nanocomposite films. The nanocomposite films were subjected to characterization by UV-visible, FTIR, X-ray diffraction, field emission scanning electron microscope (FESEM) and thermal studies. The UV-visible spectrum shows a characteristic broad absorption band observed near 465 nm suggesting presence of silver nanoparticles in polymer nanocomposites (PNCs) film. The vibrational band shift of –OH group of poly(vinyl alcohol) in the presence of nanoparticle designated the chemical interaction between –OH group of poly(vinyl alcohol) and silver nanoparticles. The FESEM study confirmed that PVA is not only acted as a capping agent, but also a cross-linking agent. X-ray diffraction study shows that the existence of AgNPs in the poly nanocomposite film and nanoaparticles are crystalline in nature. Thermal studies suggest that the enhanced thermal stability is because of the good packing of the polar crystallites in β-PVA composites as compared to the non-polar α-phase of neat poly(vinyl alcohol) (PVA).

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.

scholarly journals One-Step Preparation of Nickel Nanoparticle-Based Magnetic Poly(Vinyl Alcohol) Gels

Coatings ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 744 ◽  
Author(s):  
Jun Li ◽  
Kwang-Pill Lee ◽  
Anantha Iyengar Gopalan
Keyword(s):  
Vinyl Alcohol ◽  
Biomedical Applications ◽  
Magnetic Measurements ◽  
Poly Vinyl Alcohol ◽  
Stimuli Responsive ◽  
X Ray Diffraction ◽  
Experimental Conditions ◽  
X Ray ◽  
One Step ◽  
Stimuli Responsive Polymer

Magnetic nanoparticles (MNPs) are of great interest due to their unique properties, especially in biomedical applications. MNPs can be incorporated into other matrixes to prepare new functional nanomaterials. In this work, we described a facile, one-step strategy for the synthesis of magnetic poly(vinyl alcohol) (mPVA) gels. In the synthesis, nickel nanoparticles and cross-linked mPVA gels were simultaneously formed. Ni nanoparticles (NPs) were also incorporated into a stimuli-responsive polymer to result in multiresponsive gels. The size of and distribution of the Ni particles within the mPVA gels were controlled by experimental conditions. The mPVA gels were characterized by field emission scanning electron microscope, X-ray diffraction, magnetic measurements, and thermogravimetric analysis. The new mPVA gels are expected to have applications in drug delivery and biotechnology.

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.

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.

Sign in / Sign up

Export Citation Format

Share Document