At high temperature, talc forms transfer film on metal surface, which reduce both friction and wear behavior in mating surfaces. However, at room temperature, film formation was not observed. ... 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 ...
Increasing talc concentration leads to higher film crystallinity and the PLS model captures this relationship. The trends in some of the mechanical properties, such as Young's modulus and tensile strain at break, are also well captured by the model. Unfortunately, the measured variation range for the other mechanical properties was too small to ...
The same applies to fillers with bigger particles which may become points of stress concentration or discontinuity points in composites, thus initiating and promoting perforation [16, 18, 19]. ... Along with the increased proportion of talc, films got stiffer and felt like paper. Fig. 4. Tensile stress-strain curves of the samples.
Further, the wetting characteristics and water film stability at the talc surface have iv been studied, regarding the effect of polysaccharides such as guar gum, starch, and dextrin.
needed to support film forming ability by reducing the glass transition temperature. For this, the right concentration and structure of the plasticizer are critical. The ratio of the polymer and plasticizer is also important to ensure film flexibility and avoid cracking. Anti-tacking agents ensure a robust process
The talc particle film was produced by transferring 0.4 mL of supernatant talc suspension to the crystal and evaporating the water under vacuum. The absorbance of the peak at 3676 cm 1, due to the Mg–OH stretching vibration of the talc was typically 0.15 ± 0.01. ... in line with previous studies of the effect of salt concentration on CMC ...
Table 1 showed the experimental results of firing resistance of composite with different concentration of talc. From Table 1, it can be seen that the aqueous film forming had relatively low burning resistance, and loses its resistance to combustion at about 15.9 min, resulting in the full ignition of the oil pan.The talc enhanced significantly the fire resistance …
However, Okamafe and York (1984b) did show transitions in the tensile mechanical properties of hydroxypropyl methyl- cellulose films at talc concentrations of 8.9-14.1% and 11.9-18.8% for large and small talc particles with surface areas of 1.34 mz g-1 and 1.81 m2 g-1 respectively.
TPS films toughness was raised with talc concentration reaching an increment of 94 and 59% for 5% w/w talc addition, determined by tensile and quasi-static tests. Talc contribution to TPS films toughness could be associated to particle reinforcement of starch matrix as it was reflected in the mechanical properties previously discussed.
HPMCAS is commonly used in oral pharmaceutical formulations as a film coating, as well as an enteric coating material for tablets or granules. ... No visible differences between tablets coated with Micro Ace P3 and Talc MS have been observed with talc concentration down to 1.5%. Since no sticking of the tablets was noticed, it can be assumed ...
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 ...
The adsorption of a low molecular weight unmodified polyacrylamide (Polymer-N) and a hydroxyl-substituted polyacrylamide (Polymer-H) onto talc was studied using in situ …
At a certain range of concentrations, only a glidant may work such as talc 5%. ... Friction can be reduced by adding a continuous film of lubricants to the moving surfaces or by boundary films. Lubricants produce a film layer in between granules. ... Probably, Talc is the second most commonly used lubricant but Talc at a 5% concentration is ...
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 organic molecules diffusing …
Both values were found to notably increase with talc concentration and reached the maximum value at 8wt%. The tensile elongation at break was found to remarkably increase with PBS blending.
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 a pseudolatex.
Talc significantly reduced the stickiness of the layered or coated substrates, thus enhancing the process smoothness. 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.
Hence, this study aims at extending the application of NIR chemical imaging for characterizing PLA films filled with different talc concentrations, and submitted to thermal annealing. The films were produced by extrusion film-blowing and were inspected before and after thermal annealing under different conditions of time and temperature.
Nanocomposites films of polypropylene containing up to 5 wt% talc were obtained by blow extrusion at a pilot scale. Talc nanoparticles have preferential orientation in …
In turn, Espinosa et al. described the use of talc in a concentration of up to 5% w/w to produce polypropylene blown film [105, 106] for use in food packaging. Low price, low moisture absorption ...
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 ...
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.
Since selected talc band is independent of mineral genesis, it was obtained only one calibration curve for both composites which satisfactorily fitted experimental data (r2 ¼ 0.994). Actual talc concentrations were very close to nominal ones, being 4.95 ± 0.39 and 4.97 ± 0.45 for composites with A10 and SJ10, respectively.
The talc film was continuous and the amount of talc on the ZnS crystal that the infrared beam probed was monitored by measuring the absorbance of the peak at 3676 cm −1, ... Each consisted of 3.5 wt% solids whilst the polymer-to-talc surface area concentrations ranged from 0.34 to 3.47 mg of polymer/m 2 of talc.
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.
Critical pigment volume concentrations for a variety of pigments and opacifiers dispersed in a hydroxypropyl methylcellulose film have been determined using gloss …
Poly (lactic acid)/talc composites are prepared by melt mixing of PLA with talc in twin screw extruder followed by blown film processing. Various characterizations techniques …
On the other hand, TG curve under nitrogen atmosphere allowed verifying talc concentration of nanocomposite films based on the weight residue at 800 °C, when PP was completely degraded and only talc was the remnant material. Fig. 6 b shows the weight loss at 800 °C as a function of talc
Two talc samples with different morphologies (micro and macro-crystalline) were employed to formulate nanocomposites with several particle concentrations (0, 1, 3 and 5% w/w). Films were obtained ...
حقوق النشر © 2024.Artom كل الحقوق محفوظة.خريطة الموقع
