Concerning to talc effect on TPS films opacity, it could be appreciate that this property was increased significantly ( p < 0.05) with talc concentration (Table 1).
Moreover, the incorporation of talc into the coating film significantly affected drug release. The water vapor permeability and drug permeability of free films increased as the concentration of talc increased. Importantly, talc had a dynamic effect on the drug release. The drug release rate of the pellets in the initial stage (within 2 h ...
A fast and non-invasive near-infrared (NIR) imaging system is proposed to characterize biodegradable polylactic acid (PLA) films containing talc, and produced by extrusion film-blowing for packaging applications. The ultimate goal is to use the system on-line for quality control and after a post-processing thermal treatment (annealing). A set of …
Thermoplastic corn starch films with talc nanoparticles were obtained. ... and better dimensional stability at very low filler concentrations (Fornes & Paul, 2003). Most of the works reported in the literature are related with starch matrixes containing different clays (Alexandre and Dubois, 2000, Chen and Evans, 2005, Cyras et al., 2008 ...
The talc surface changed from a hydrophobic state to a hydrophilic state with high concentrations of polysaccharides, and thus, the water film became stable, preventing bubble attachment.
The best lubricity was achieved at the temperature of 100 °C and the concentration of 0.15 wt% when dynamic and static friction coefficients were reduced by over 30% in comparison to reference lubricating oil alone. At high temperature, talc forms transfer film on metal surface, which reduce both friction and wear behavior in mating …
Few pinholes were observed in SEM images of PLA1 films with 3–5 wt% of talc while a higher talc concentration (4 wt%) was needed for pinhole formation in …
The blown film extrusion of neat PBAT and PBAT/Talc-based composite films was carried out using the Collins Blown Extrusion Machine produced by Collin Lab & Pilot Solutions, Inc., U.S.A. Fig. 2 shows the graphical representation of the complete film production process. The extruder temperature was set at 30/145/150/155/160 °C for all …
Increasing talc concentration was found to decrease the ability of the polymer films to resist mechanical stress. In contrast, glyceryl monostearate (GMS) and PlasACRYL produced more elastic films. Talc at concentrations higher than 25% caused negative effects, which make 25% concentration recommended to be used with acrylic polymers.
A dry film coating composition for use in coating pharmaceutical tablets, nutritional supplements, food, confectionery forms, agricultural seeds, and the like, comprises polyvinyl alcohol, a plasticizer such as polyethylene glycol or glycerin, talc, and preferably a pigment/opacifier and lecithin. A method of coating substrates such as pharmaceutical …
The water vapor barrier properties of BioPBSA+25%Talc film at SR 4 shows an improvement of 40% compared to its unstretched counterpart, while an overall …
Anti-blocking is a term used to describe measures to prevent film sheets from sticking together. Different strategies are used to achieve anti-blocking, i.e., increasing roughness to decrease contact area between layers by adding mineral particles into the polymer or using slip additives allowing the sheets to slide easily against each other by …
The spectra the talc-coated ATR crystal was halted, calcium chloride sufficient allow one to follow the protonation of the carboxyl groups in the to give a concentration a Ca2+ concentration of 3.33 10 4 M was adsorbed polymer layer as the pH is lowered, as well as changes added to the reservoir prior to the recommencement of solution to the ...
The CMC sample was analysed in solution at a concentration of 20,000 mg L −1 by single reflectance ATR-FTIR spectroscopy at pH 2 and pH 8.3. The infrared spectra are presented in Fig. 2 with peak locations and assignments listed in Table 1.A full description of the spectral changes that occur to CMC in solution with variation of pH is …
The effect of pigment volume concentration (PVC) on the film formation process and properties of coatings based on the water dispersion of an Acronal 290D styrene-acrylate copolymer and a pigment/filler system used for paint materials in construction was investigated. An analysis of the results obtained is performed within the …
Film coating is a complex process that involves different factors. To ensure spreading and/or film forming capability plasticizers are added. The type and …
Increasing talc concentration was found to decrease the ability of the polymer films to resist mechanical stress. In contrast, glyceryl monostearate (GMS) and …
Talc is a naturally occurring mineral that is commonly used in a wide range of industries, including the pharmaceutical industry. In pharmaceuticals, talc is used as a lubricant and diluent in tablet formulations, as well as a glidant in capsule formulations. It is also used as an excipient in topical and oral suspensions, and as a bulking ...
When the concentration of talc was 40.00 g/100 ml, a large amount of talc powder accumulated in the liquid film, which made the liquid film very thick. The bubble size decreased and the number of bubbles increased. The aggregation of talc powder in the liquid film between bubbles formed a hard shell to protect bubbles, as shown in Figure 7.
The puncture measurements showed improved mechanical properties at lower content of talc (up to 5 wt%), and increased brittleness of the PLA/talc composite films at higher talc concentrations ...
In the present study, influence of talc on thermal, mechanical and rheological behavior of PLA is investigated and the structure–property correlation for the PLA/talc composites is established. Poly(lactic acid)/talc composites are prepared by melt mixing of PLA with talc in twin screw extruder followed by blown film processing. …
Concerning to talc effect on TPS films opacity, it could be appreciate that this property was increased significantly (p < 0.05) with talc concentration (Table 1). Despite of mineral presence increased films opacity, their values were low since filler particles are extremely thin, as it could be observed by TEM in Fig.2.
As public awareness about climate change grows, there is an increase in the research on bioplastic packaging films. This is the first-ever scientific report on uniaxially stretched biobased-polybutylene succinate-co-adipate (BioPBSA) and talc (15 and 25 wt%) based blown film composites at different stretch ratios (SR).The water vapor barrier …
Talc forms transfer film on metal surface to reduce friction and wear. Abstract. ... After the initial run in, the friction coefficient stabilized and optimal results were achieved with a 0.15 wt% concentration of talc in oil. In this best case scenario, the dynamic and static friction coefficients were 0.11 and 0.15, respectively, which are ...
A comparative study on different enteric-coated hard capsules was performed. The influence of different formulation factors like choice of enteric polymer, triethyl citrate (TEC) concentration (plasticizer), talc concentrations (anti-tacking agent), and different coating process parameters on the sealing performance of the capsule and …
The wetting characteristics and water film stability at the talc surface have been studied, particularly the effect of polysaccharides such as guar gum, starch, and dextrin. Talc is a gangue mineral in the flotation of base metal sulfide ores, precious metal sulfide ores, and platinum group metal (PGM) sulfide ores. Talc surfaces were …
Talc is a naturally occurring mineral, mined from the earth, composed of magnesium, silicon, oxygen, and hydrogen. Chemically, talc is a hydrous magnesium silicate with a chemical formula of Mg 3 ...
the powder (talc þ silica) contained in the Cyclomix is recovered and analyzed. To study the influence of silica con-centration, a processing time of 10 min was used and the values of the silica concentration were in the range from 0 to 10 wt %. To study the effect of the processing time, the silica concentration was fixed at 3% and the ...
GMS could reduce the mechanical properties of the film at higher extent than talc especially at high concentration (20–30% w/w). When the higher amount of …
GMS could reduce the mechanical properties of the film at higher extent than talc especially at high concentration (20–30% w/w). When the higher amount of the anti-tacking agents was incorporated, the higher degree in reduction of both puncture strength and elongation values was obtained. ... The FTIR spectra of Eudragit ® RL 30D …
The effect of glycerol as plasticizer on film properties depend on its concentration, being 1.5% w/w those that allows to obtain the lowest WVP value (1.64×10(-11)g/msPa), low film solubility in ...
The film composition was altered in ratio PVAc/PVAc-PEG, and in concentration plasticizer. They found that the concentration plasticizer did not affect the drug release, whereas both film thickness and polymer composition did have an effect. The higher the PVAc ratio, and the higher the thickness, the slower the release. Zein is also …
The concentration dependences of (M') for phonons propagating along and across the film are shown in Fig. 2a.The elastic modulus increases with increasing gelatin concentration for both types of phonons. Close values of the modulus for both directions of phonon propagation indicate that the hydrogel films are elastically isotropic.
At talc and mica filler concentrations around 50 wt.%, moduli and impact resistances in the range of PLA (3000–4000 MPa and 2–4 kJ/m 2) are obtained. Based on this analysis, the resulting polymer composites could be considered as a PLA alternative that has a higher biodegradation rate in natural environments such as soil.
When formulating paint, the pigment/binder ratio used plays a central role. This ratio is accounted for by means of the pigment volume concentration (PVC), calculated as pigment volume divided by the total dry film volume, and it is key to paint's aesthetics and physical properties. Using the correct pigment PVC is an essential consideration in …
Addition of talc particles to the oil lubricant decreased the wear loss, frictional heating and friction coefficient while the applied load produced a reverse effect. Further, increasing content of talc up to 3–5% led to a decrease in the observed properties; the trend reversed at higher concentrations of the suspended mass in the oil.
Figure 3 shows the wear rate of the cast iron plotted as a function of graphite/talc content in the oil lubricant for different graphite-to-talc ratios therein. The wear rate decreased with increasing concentration of the solid lubricant particles in the oil initially, attained the minimum at 5% talc for oil plus talc and 40% graphite with or …
Moreover, the incorporation of talc into the coating film significantly affected drug release. The water vapor permeability and drug permeability of free films increased …
