Metallocene Polyethylene mPE

Metallocene PF is made with a metallocene catalyst or single-site catalyst (SSC) in a slurry loop process. These grades are copolymer materials with very narrow MWD, specifically formulated for rotational moulding. These materials have superior mechanical properties, a significantly reduced low molecular weight (i.e., extractable) content, and even better whiteness than the traditional LLDPE materials. Metallocene grades now account for about 15% of global LLDPE consumption 

While mPE materials are much like other PE grades, they can be produced with a very wide range of properties. One of the key property benefits is the ability to synthesize very soft, flexible grades. These provide some interesting opportunities for final film products, but a feed material that deforms easily and melts quickly requires some process modifications. 

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Metallocene polyethylene (MPE) is a new PE product initiated and polymerized by metallocene calalyst. It has a narrow molecular weight distribution (d = 2) uniform molecular chain structure higher crystallinity, strength, toughness, and transparency and excellent performance. However, MPE melt has a high viscosity that makes processing difficult, which limits its application. 

The linear metallocene polyethylene (mPE) reference, polymer Clb P5, shows stress-independent steady-state viscosity throughout the stress range measured, whereas the LDPE shows strain hardening behavior typical for that range. At low stress, the response is equal to three times the LVE shear viscosity. Increasing the tensile stress leads to strain hardening up to a maximum stress, after which the response becomes extension thinning [121]. In contrast to the LDPE, the steady-state extensional viscosity ( /e) of branched mPE polymer C4 P1 appears... 

Metallocene polyethylene (mPE) plastomers 0.900-0.915 Coextrusion, heat seal layers Ethylene-vinyl acetate (EVA) resins with 9% vinyl acetate, ultra low density polyethylene (ULDPE), very low density polyethylene (VLDPE)... 

As part of a multi-technique investigation (see also discussion under mid-infrared spectroscopy later), Corrales et al. [13] plotted the carbonyl index for films prepared from three grades of polyethylenes a high-density PE (HDPE), a linear low-density PE (LLDPE) and a metallocene PE (mPE) (see Figure 5). In this study, the data trend shown in Figure 5 correlated well with activation energies derived from the thermal analysis, which showed that the thermal-oxidative stability followed the order LLDPE > mPE > HDPE, whereas the trend... 

MPE metallocene polyethylene MUP Danish Materials Research Program... 

Fig. 23. Melt viscosity data for LDPE, LLDPE, and mLLDPE all normalized tol g/10 min melt index. Also shown is new type of easy-processing metallocene-catalyzed polyethylene, mPE. To convert Pa-s to P, multiply by 10.

An example for the use of fractography for evaluating the phase morphology of polymer blends is shown in Figure 17. The specimen, a PP with 30-wt% of a metallocene polymerized polyethylene (mPE), was fi actured at —30°C. Afterwards the mPE-phase was dissolved in xylene, so that the resulting holes visualize the distribution of mPE in the PP matrix. The micrograph shows a... 

MMP multimaterial molding or multimaterial multiprocess MO molecular orientation MP Modern Plastics publication MPa mega-Pascal (10 Pascal) mPE metallocene polyethylene MRPMA Malaysian Rubber Products Manufacturers Assoc. 

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