Density Polyethylene MDPE

MDPE is typically a mixture of LDPE and HDPE and will not be considered here as a separate type of PE. None of WPG manufacturers have reported that they use medium-density polyethylene to make their products. Trex, apparently, can get into this category, bnt they report that they nse polyethylene for the mannfactnring of WPG (IGG-ES Report ESR-1190, Jnne 1, 2005). 

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Hexane Permeation Predictions for Medium-Density Polyethylene (MDPE) Sheet Sample of Thickness 1.57 mm at 40°C... 

Medium color carbon blacks, 4 798t Medium density polyethylene (MDPE) resins, 77 700, 701... 

FT-IR spectroscopy has been used in the investigation of welding crosslinked polyethylene pipes [23]. Three types of crosslinking systems were used namely, peroxide (PEXa), silane (PEXb) and electron beam (PEXc). Scholten and co-workers [23] observed that only PEXa pipes have a satisfactory electrofusion quality. The strength of electrofusion welds of PEXb and PEXc pipes is not acceptable. The most likely explanation for the differences in weld quality is related to the adhesion theory and more specifically to differences in composition. Figure 5.6 shows the infrared spectra of medium density polyethylene (MDPE), PEXa, PEXb and PEXc. 

Table 2 Diffusion data for low molecular weight organic substances in Polyethylenes (PE). Medium and High Density Polyethylenes (MDPE HDPE) 498...

Applications To produce high density polyethylene (HDPE) and medium density polyethylene (MDPE) under low-pressure slurry process—"CX process."... 

Medium Density High Density Polyethylene MDPE (or MDHDPE) is produced by copolymerization of ethylene with a-olefins using Ziegler-Natta, supported chromium or single site catalysts. MDPE cannot be produced by free radical polymerization. MDPE has a linear structure similar to LLDPE, but comonomer content is lower. Density is typically 0.93-0.94 g/cm. MDPE is used in geomembrane and pipe applications. 

Figure 3 Transitiometric investigation of the pressure effect on the isobaric thermal expansivities a. of gaseous, liquid, and solid substances (a) comparison between calculated ana experimental data of methane at 333 K (bl) quinoline as a simple fluid (b2) water as the associated liquid (cl) effect of temperature on medium-density polyethylene (MDPE) (c2) evolution of with the crystallinity (points represent the experimental data and the lines were obtained by the least squares fitting of data) (c3) comparison between the experimental a for three polyethylenes with different degrees of crystallinity and the predicted values for crystal and amorphous phases obtained by extrapolation from linear fitting of the experimental data...

Mechanical properties of the composite materials, 129 Mechanical strength, 81, 83 Medium density polyethylene (MDPE), 55, 67, 68, 363... 

Application The Borstar polyethylene (PE) process can produce a broad range of bimodal and unimodal linear-low-density polyethylenes (LL-DPE), medium-density polyethylenes (MDPE) and high-density polyethylenes (HOPE). The Borstar PE consists of a loop reactor and a gas-phase reactor In series. 

Application The UNIPOL Polyethylene (PE) Process produces the widest array of linear low-density polyethylene (LLDPE), medium-density polyethylene (MDPE) and high-density polyethylene (HOPE) having unimodal or bimodal molecular weight distribution (MWD) using a single, low-pressure, gas-phase reactor. 

Medium density polyethylene (MDPE), 0.925-0.940 g/cm, is sometimes listed as a separate category, but usually is regarded as the high density end of LDPE. It is somewhat stronger, stiffer, and less permeable than lower density LDPE. MDPE processes similarly to LDPE, though usually at slightly higher temperatures. 

Medium-density polyethylene (MDPE) polymers with densities ranging fiom 0.926 to 0.940 g/cm that might or might not contain a comonomer and... 

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