Apparent viscosity and melt density were measured in both extrusion modes. Apparent density decreased at shear rates approaching the melt fracture region in fixed piston-speed operation. Flow of other polymer melts was essentially incompressible in fixed piston-speed operation, and all polymers exhibited...
(i) leads to the formation of quenched-in nuclei, which do not get an opportunity to grow. This condition is most readily satisfied during melt spinning. Though glass is formed under this condition, the glass has quenched-in nuclei, the density of nuclei being controlled by the rate of ...
Being able to control the latter quantity (e.g., by simple thermal treatments applicable at the industrial scale) would open the way to new processing strategies to finely tune the interfacial density7,15 and, hence, the properties of nanomaterials. Remarkably, polymers adsorb more easily than ...
Gas filtration: medical masks, indoor air conditioner filtration materials, filter media, etc. In order to improve the filtration effect, the fiber fineness can be reduced and the density of the filter material can be increased, but this will cause a significant increase in infiltration resistance....
(Fig.11A) and was previously21. From the pH range of 2.0–4.0, theqeshows no changes but there is a drastic change from pH 4.0–10.0, this is due to pHPZNCvalue of the montmorillonite sample at high pH. The study indicated that the overall negative charge density of the adsorbent ...
Two different polymers from the company LyondellBasell were used for the experimental investigations. The low-density polyethylene (LDPE) is called Lupolen 2420D and the name of the polypropylene is HP420M. The Carreau parameters at 230 °C for both materials are listed in Table 1. The calculati...
One of the parameters that gives an indication of the solid material’s flowability and compressibility is the Hausner ratio (HR), obtained from the ratio between the density at compaction and the apparent density of the powder. A high value of this index indicates an accentuated cohesive charact...
A polystyrene resin in foam form having a basis weight of less than about 20 g/100 in2 and a density of about 6 lbs./ft3 or less, the foam precursor of which is either a polystyrene having a melt index of about 8 or more or a polystyrene in combination with a minor proportion of ...
The foam sheet had a density of approximately 30pcf (despite passing through a three roll stack) and was successfully thermoformed into trays. The trays, when analyzed for extractable PMDA using the analytical techniques of Examples A and B, had levels of unreacted PMDA in the range of about ...
2). MDS can be used to separate multiple polymer fractions in a single step because it uses a magnetic liquid as a separation medium, by using special magnetic field, the density of the liquid can be varied (Rem et al., 2013). MDS has been successfully applied to separate PP and PE ...