Polymer HDPE

As with nearly all other polymers, HDPE resin is a collection of polymer chains of different lengths, varying from short, with molecular weights of 500—1000, to very long, with molecular weights of over 10 million. Relative contents of chains with different lengths (ie, the shape and width of MWD) depend mostly on production technology and on the type of catalyst used for polymerization. The MWD width of HDPE resins can be tailored to specific apphcations. 

Carbon black interacts strongly with polymer (HDPE) to produce a large increase in storage modulus in a manner similar to the surface treated glass beads. The storage modulus is less sensitive to frequency. The storage modulus increase is explained by the effect of modifier on crosslinking. 

E.A. Benham, M.P. McDaniel, Ethylene Polymers, HDPE, in H.F. Mark (Ed.), Kirk-Othmer Encyclopedia of Polymer Science and Technology, third ed, Wiley, Hoboken, 2001 (4th Ed. 2003), updated in 2006 in Kirk-Othmer Encyclopedia of Chemical Technology (Seidel, A., Ed.), Wiley, Hoboken, vol. 20, p. 149-179,2006. 

Tables 17.9 and 17.10 show the magnitude of shear thinning behavior for some neat polymers (HDPE and PP) and composites.

Fortiflex . [Solvay Polymers] HDPE resins for inj. and btow molding of automotive, cosmetic, household and industrial goods, sheet extrusion and thermoforming, pipes, films. 

Benham E, McDaniel M, and Herman F. Mark. Ethylene polymers, HDPE. In Encyclopedia of Polymer Science and Technology. John Wiley Sons [ONLINE] 2010. p 1-30. 

In Section 9.3 we present experimental studies of plastic deformation in two semi-crystalline polymers, HDPE and Nylon-6, both in tension and in plane-strain compression flow, from initial spherulitic morphologies to large plastic strains. In these studies, the evolving morphological alterations were monitored closely by a complementary array of techniques involving light microscopy and X-ray diffraction and scattering both in the crystalline and in the amorphous components. 

Soltex Polymer HDPE "Fbrtiflex XF855 contains 25% post-... 

Mechanical properties of studied composites reinforced with pretreated fibers are summarized in Table 10.1. Composites showed distinct mechanical properties, indicating that the pretreatment affects the fibers-matrix interaction compared to the pure polymer (HDPE). However, the amotmt of added reinforcement contributes to variation of the tensile modulus. 

Manufacturers Adeka, BASF Recommended for polymer HDPE, PA, PBT, PP... 

Polyethylene. AFM imaging of thermoplastics has been widely used to corroborate and expand knowledge obtained using other structural methods, such as x-ray crystallography and electron microscopy. Direct observation of folded chain lamellar crystals of polyethylene (PE) was provided by afm. Spacings appropriate for the (known crystallographic) orthorhombic imit cell, and for the monoclinic unit cell that can be produced by mechanical deformation, were observed (84) as were boimdaries between regions of differently oriented folded chains (85) (see Ethylene Polymers, HDPE). 

See Ethylene Polymers, LDPE Ethylene Polymers, HDPE Ethylene Polymers, LED PE Vinyl Alcohol Polymers Vinyl Chloride Polymers Vinylidene Chloride Polymers (PVDC) Polyamides, plastics Polyesters, thermoplastic Propylene Polymers (PP) Methacrylic Ester Polymers Acrylonitrile Polymers Styrene Polymers (PS) Ionomers. 

HIGH DENSITY POLYETHYLENE. See Ethylene Polymers, HDPE. 

FIGURE 2.15 Influence of temperature on Izod impact strength of various polymers of low and high melt indexes. GMT 61 is a low-melt-index and low-notch-sensitivity polypropylene copolymer. KMT 61 is a high-melt-index and low-notch-sensitivity polypropylene polymer. HDPE 65045 is a high-melt-index and high-notch-sensitivity high-density polyethylene. 

As a matrix polymer HDPE with melt flow index of 1.0 g/10 min and crystallinity degree K of 0.72, determined by samples density, manufactured by firm Hrmtsman LLC, was used. As nanofrller organoclay Na" -montmorillonite of industrial production of mark Cloisite 15, supplied by firm Southern Clay (USA), was used. A maleine anhydride (MA) was applied as a coupling agent. Conventional signs and composition of nanocomposites HDPE/MMT are listed in Table 1 [3]. 

Secondary Polymers HDPE Colored and natural HDPE flake... 

The similar semicrystalline polymers HDPE and LDPE show under strong mixing conditions (with larger shear forces) a separation between the two phases only at the macromolecular level with the formation of separate lamellae (containing only linear or branched macromolecules) or the formation of mixed lameliae (cocrystallization). An example is shown in Fig. 4.8, which presents TEM micrographs of LDPE, LDPE/HDPE blends with a composition of 70/30 and 30/70, and HDPE. The exactly measured frequency distributions of thicknesses of the iameiiae show that a part of the linear macromolecuies (of HDPE) is cocrystallized with branched macromolecules in the same lamellae (of LDPE) [10]. 

The authors of Ref [19] carried outflie theoretical estimations for two polymers (HDPE and PAr) according to the Eq. (6.12) at the condition T = const = 0.69x10 Paxs. The parameters and n j values for these polymers were accepted according to the data of Refs. [32] and [23], respectively. The calculation gave the following values 18.0 MPa for HDPE and 47.8 MPa for PAr, that corresponds well (within the limits of 10%-th error) to experimental data. 

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