Synthesis and Properties of Poly(vinyl alcohol)/Synthetic F‐montmorillonite Nanocomposites

Abstract

F-montmorillonite (F-MMT) was synthesized by a hydrothermal method at 493 K for 72 h, in which a little of hydroxyl radical is replaced by fluoride ion in the silicate structure. Poly(vinyl alcohol) (PVA)/F-MMT nanocomposites were prepared using the synthetic F-MMT by a solution-intercalation method. The F-MMT and PVA/ F-MMT nanocomposites were characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The results indicate that the flake structured F-MMT is homogeneously dispersed in PVA, forming an exfoliated nanocomposite structure. Thermogravimetric analysis, mechanical performance and UV-visible spectroscopy were applied to test the properties of PVA nanocomposites, which indicate that the thermal stability and mechanical performance are enhanced distinctly, without a sacrifice in optical clarity. The improvement of mechanical and thermal properties was attributed to the homogeneous and good dispersion of F-MMT in polymeric matrix and the strong hydrogen bonding between O-H of PVA and F -of F-MMT.

Effect on thermal and combustion behaviors of montmorillonite intercalation nickel compounds in polypropylene/IFR system

“…The PP/IFR/OMINC nanocomposites have large platforms in the combustion process, and the peaks of HRR at around 430 sec disappeared. The aforementioned results suggest that the excellent flame‐resistant performances come from MMT barrier effect and catalytic charring performance of nanoscale nickel compounds . The mechanism may be that the formed protective layer serves as a barrier to restrict the spread of flame …”

“…Polymer nanocomposites have shown great improvements in flame retardant properties as well as other behaviors even at low filler contents, because nanomaterials as catalysts and sheet‐separating agents can convert the flammable polymer to graphite under fire conditions, acting as a physical barrier and protecting the underlying materials from the action of heat and flame. Among them, polymer/clay nanocomposites have been extensively studied for a variety of applications including improved mechanical properties, gas barrier performance, improved thermal properties, and reduced flammability . In the last decade, most concentrations focus on montmorillonite (MMT)‐based nanocomposites, which are mainly attributed to nanosize and layer barrier effect.…”

Preparation and evaluation of antimicrobial activity of nanosystems for the control of oral pathogens Streptococcus mutans and Candida albicans

“…A decrease in the 2θ value observed in the XRPD analysis is an indicative factor of the inclusion process since a reduction in this angle is associated with an increase in basal spacing, which is related to drug inclusion. 23 The chlorhexidine nanosystem obtained showed a 2θ value decrease, described in Table 1, when compared with pure MMTNa, indicating the success of the inclusion process. However, there is no significant difference between all the proposed conditions presented in Table 1 (P .…”

Study on Formation Kinetics and Mechanism of Barium-Calcium Phosphoaluminate Mineral

“…x A 3 $) were synthesized and characterized, the mineralogical composition of which with the optimum mechanical properties was determined, and the cement with the C 2.75 B 1.25 A 3 $ as the main mineral was invented [18][19][20]. Furthermore, Cheng et al [20][21] rstly synthesized and produced barium-calcium sulphoaluminate cement with excellent performance by using industrial waste containing barium.…”