scholarly journals Study of Properties of Some Polyethylene-Clay Nanocomposites: Influence of Preparation Method on the Degree of Clay Intercalation/Exfoliation

2014 ◽  
Vol 9 (1) ◽  
pp. 106-111 ◽  
Author(s):  
Fulga Tanasa ◽  
Madalina Zanoaga
Keyword(s):  
Preparation Method ◽  
Clay Nanocomposites ◽  
Clay Intercalation

scholarly journals Ultrasound Assisted Synthesis of Polylimonene and Organomodified-clay Nanocomposites: A Structural, Morphological and Thermal Properties

2020 ◽  
Vol 15 (3) ◽  
pp. 798-807
Author(s):  
Hodhaifa Derdar ◽  
Geoffrey Robert Mitchell ◽  
Zakaria Cherifi ◽  
Mohammed Belbachir ◽  
Mohamed Benachour ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Preparation Method ◽  
Exchange Process ◽  
Clay Nanocomposites ◽  
X Ray Diffraction ◽  
Electronic Microscopy ◽  
X Ray ◽  
Degradation Temperature ◽  
Ultrasonic Assisted ◽  
Ft Ir

Polylimonene-clay nanocomposites (PLM-Mag 2, 3, 6 and 10% by weight of clay) were prepared by mixing Maghnite-CTA+ (Mag-CTA+) and polylimonene (PLM) in solution using ultrasonic irradiation. The catalyst preparation method were studied in order to determine and evaluate their structural, morphological and thermal properties. The Mag-CTA+ is an organophylic montmorillonite silicate clay prepared through a direct exchange process, using green natural clay of Maghnia (west of Algeria) called Maghnite. The Algerian clay was modified by ultrasonic-assisted method using cetyltrimethylammonuim bromide (CTAB) in which they used as green nano-reinforcing filler. Polylimonene was obtained by the polymerization of limonene, using Mag-H+ as a catalyst. The morphology of the obtained nanocomposites was studied by X-ray diffraction (XRD), scanning electronic microscopy (SEM), transmission electronic microscopy (TEM) and infrared spectroscopy (FT-IR). Thermogravimetric analysis (TGA) shows that the nanocomposites have a high degradation temperature (200−250 °C) compared with the pure polylimonene (140 °C). The analyses confirmed the chemical modification of montmorillonite layers and their uniformly dispersion in the polylimonene matrix. Exfoliated structures were obtained for low amounts of clay (2 and 3% by weight), while intercalated structures and immiscible regions were detected for high amounts of clay (6 and 10% by weight). Copyright © 2020 BCREC Group. All rights reserved 

Clay Intercalation and its Influence on the Morphology and Transport Properties of EVA/Clay Nanocomposites

2012 ◽  
Vol 116 (37) ◽  
pp. 20002-20014 ◽  
Author(s):  
Runcy Wilson ◽  
Sajeev Martin George ◽  
Hanna J. Maria ◽  
Tomás S. Plivelic ◽  
Anil Kumar S ◽  
...  
Keyword(s):  
Transport Properties ◽  
Clay Nanocomposites ◽  
Clay Intercalation

Polyethylene Organo-Clay Nanocomposites: The Role of the Interface Chemistry on the Extent of Clay Intercalation/Exfoliation

2006 ◽  
Vol 6 (2) ◽  
pp. 337-344 ◽  
Author(s):  
Michaël Mainil ◽  
Michaël Alexandre ◽  
Fabien Monteverde ◽  
Philippe Dubois
Keyword(s):  
Clay Nanocomposites ◽  
Interface Chemistry ◽  
Organo Clay ◽  
Clay Intercalation

New Method for Preparing Rubber/Clay Nanocomposites

2011 ◽  
Vol 110-116 ◽  
pp. 3810-3817 ◽  
Author(s):  
Jing Hua Tan ◽  
Xiao Ping Wang ◽  
Yuan Fang Luo ◽  
De Min Jia
Keyword(s):  
Preparation Method ◽  
Aqueous Suspension ◽  
Mechanical Analysis ◽  
Clay Nanocomposites ◽  
Structure And Properties ◽  
X Ray Diffraction ◽  
Rubber Latex ◽  
X Ray ◽  
Aging Resistance

Rubber/Ca-montmorillonite (Ca-MMT) nanocomposites with exfoliated Ca-MMT layers was prepared by a new preparation method named masterbatch method, in which the masterbatch was prepared by co-coagulating nature rubber latex and bis [3-triethoxysilylpropyl-] tetrasulfide (TESPT) modified Ca-MMT aqueous suspension and then the masterbatch accompanied with carbon black (N220) were used in the system of SBR and ENR. The properties of TESPT in-situ modified Ca-MMT were investigated by Fourier-transform infrared spectroscopy and thermogravimetric analysis. The results showed that the TESPT has reacted with the surface groups of Ca-MMT. The dispersion of the Ca-MMT in masterbatch and vulcanized sample was characterized by X-ray diffraction. The results showed that in the masterbatch an exfoliated structure was obtained and in the vulcanized sample a coexistence of intercalated-exfoliated structure was obtained. The influence of the Ca-MMT loading on the structure and properties of the nanocomposites were studied. It was found that the incorporation of Ca-MMT hindered the vulcanization, improved mechanical properties, thermal properties and aging resistance properties. The dynamic mechanical analysis results showed a decrease of tanδ max when the Ca-MMT is added.

scholarly journals Influence of Laurolactam Content on the Clay Intercalation of Polyamide 6,12/Clay Nanocomposites Synthesized by Open Ring Anionic Polymerization

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
E. N. Cabrera Álvarez ◽  
L. F. Ramos de Valle ◽  
F. J. Rodríguez González ◽  
F. Soriano-Corral ◽  
R. E. Díaz De León
Keyword(s):  
Molecular Weight ◽  
Montmorillonite Clay ◽  
Polymerization Reaction ◽  
Conversion Degree ◽  
Clay Nanocomposites ◽  
Magnesium Bromide ◽  
X Ray Diffraction ◽  
Sodium Montmorillonite ◽  
Clay Intercalation

In situanionic homo- and copolymerization of caprolactam (CL) and laurolactam (LL) with sodium montmorillonite clay (NaMMT) was carried out using two different initiators, sodium caprolactamate (CLNa) and caprolactam magnesium bromide (CLMgBr). Degree of conversion and final molecular weight were used to assess the advancement and efficiency of the polymerization reaction and X-ray diffraction and electron microscopy were used to evaluate the sodium montmorillonite clay intercalation/exfoliation. The use of CLNa as initiator produced a higher conversion degree and molecular weight than the use of CLMgBr. Through DSC, it was observed that CLNa and CLMgBr tended to produce random and block copolymer structures, respectively, and either random or block, this eventually has an effect on the clay dispersion within the polymer matrix. In all cases, increasing the LL content produced a decrease in the conversion degree and in the molecular weight of the resulting polymer.

Clay intercalation and influence on crystallinity of EVA-based clay nanocomposites

2005 ◽  
Vol 433 (1-2) ◽  
pp. 187-195 ◽  
Author(s):  
D.S. Chaudhary ◽  
R. Prasad ◽  
R.K. Gupta ◽  
S.N. Bhattacharya
Keyword(s):  
Clay Nanocomposites ◽  
Clay Intercalation

Direct Observation of Heat Exchanger Deposits by Cross Sectioning

1967 ◽  
Vol 25 ◽  
pp. 364-365
Author(s):  
R. W. Anderson ◽  
D. L. Senecal
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Heat Exchanger ◽  
Direct Observation ◽  
Cross Sections ◽  
Preparation Method ◽  
Specimen Preparation ◽  
Flowing Water ◽  
Transmission Electron ◽  
Deposit Layer

A problem was presented to observe the packing densities of deposits of sub-micron corrosion product particles. The deposits were 5-100 mils thick and had formed on the inside surfaces of 3/8 inch diameter Zircaloy-2 heat exchanger tubes. The particles were iron oxides deposited from flowing water and consequently were only weakly bonded. Particular care was required during handling to preserve the original formations of the deposits. The specimen preparation method described below allowed direct observation of cross sections of the deposit layers by transmission electron microscopy.The specimens were short sections of the tubes (about 3 inches long) that were carefully cut from the systems. The insides of the tube sections were first coated with a thin layer of a fluid epoxy resin by dipping. This coating served to impregnate the deposit layer as well as to protect the layer if subsequent handling were required.

Scanning electron microscopy of human iliac bone by a simple preparation method

1990 ◽  
Vol 48 (3) ◽  
pp. 226-227
Author(s):  
Toshihiko Takita ◽  
Tomonori Naguro ◽  
Toshio Kameie ◽  
Akihiro Iino ◽  
Kichizo Yamamoto
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Preparation Method ◽  
Specimen Preparation ◽  
Real Surface ◽  
Public Attention ◽  
Preparation Methods ◽  
The Real ◽  
Simple Preparation ◽  
Scanning Electron

Recently with the increase in advanced age population, the osteoporosis becomes the object of public attention in the field of orthopedics. The surface topography of the bone by scanning electron microscopy (SEM) is one of the most useful means to study the bone metabolism, that is considered to make clear the mechanism of the osteoporosis. Until today many specimen preparation methods for SEM have been reported. They are roughly classified into two; the anorganic preparation and the simple preparation. The former is suitable for observing mineralization, but has the demerit that the real surface of the bone can not be observed and, moreover, the samples prepared by this method are extremely fragile especially in the case of osteoporosis. On the other hand, the latter has the merit that the real information of the bone surface can be obtained, though it is difficult to recognize the functional situation of the bone.

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