Polyethylene properties

Polyethylene properties can be markedly changed and in accordance with the coreacted monomer particularly affected are the hydrophobic and thermomechanical properties. 

Table 8.3 High-Impact Polyethylene Properties (courtesy of Delta Cooling Towers, Carborundum Corp., Fairfield, NJ)...

Introduction to Industrial Polyethylene Properties, Catalysts, Processes by Dennis P. Malpass. Published 2010. ISBN 978-0-470-625989. 

Tab. 1.4 Polyethylene properties obtained with [Ni/Ph3P-BC/R3PX] catalysts...

Polyethylene Properties. Polyethylenes are colorl materials, practically tasteless and odorless, and physiologically unobjectionable. They are among the most inert and stable of polymers. Polyethylenes are practically insoluble in all solvents at ordinary temperatures, are resistant to... 

Introduction to Industrial Polyethylene Properties, Catalysts, Processes by... 

Figure 14.6 Links between pipe properties, polyethylene properties and microstructural parameters.

Uses Stabilizer for natural and syn. latex emulsions acid degreaser, dyeing assistant for textiles dyestuff dispersant, tanning assistant, fat liquor, degreaser for leathers solubilizer and emulsifier for essential oils and pharmaceuticals emulsifier for aq. dispersions of polyethylene Properties Liq. HLB 15.4 cloud pt. < 100 C (1% aq.) nonionic 70% cone. 

Commercial High-Density Polyethylene, Properties and Manufacture... 

Ethofil Fiberglass Reinforced Linear Polyethylene Properties, Fiberfil Division, Dart Industries, Evansville, IN, Unnumbered, Undated. 

TABLE 3-80. EFFECT OF 1/B in. GLASS CONTENT ON VAHIDUS ROTATIONAL MOLDED POLYETHYLENE PROPERTIES... 

Polyethylene Properties of the different forms of polyethylene are reflected in their uses. Linear molecules of polyethylene can pack together very closely, as shown in the model of high-density polyethylene (HDPE). The branches of branched polyefhylene keep the molecules from packing fightly, as shown in the low-density polyethylene (LDPE) structure. The cross-links of cross-linked polyethylene (cPE) make it very strong. 

Fluoropolymer-based processing additives provide a range of benefits beyond melt fracture elimination. Among these benefits are improved production capacities, and a better control of molecular orientation and final physical properties. Owing to their design and low volumetric contributions, no adverse effects have been detected which can be attributed to the PPA s presence. Careful selection of other additives used with the PPA can minimize the PPA requirement. Finally, the use of newer products, such as PPA-2, can overcome additive interferences to further enhance polyethylene properties and productivity. 

Prior to the discovery of single-site catalysts the polyethylene industry was limited to conventional 1-olefins, primarily 1-butene, 1-hexene and 1 -octene, as comonomers that were used to control polyethylene properties. In this regard, the amoxmt and type of 1-olefin in the finished polymer were the important variables. 

Several historic publications that provided early evidence into the chemistry involved in this process were published between the 1920s and 1940s. Christiansen [4] and Backstrom [5] provided data in 1924 and 1927, respectively, that a chain reaction was involved. Next, in the early 1930s, Backstrom [6] and Ziegler and Ewald [7] demonstrated that the oxidation of hydrocarbons was initiated by free radicals. In 1942, Farmer and coworkers reported that an autocatalysis process involving free radicals and the formation of hydroperoxides was involved [8]. This 1942 paper identified the three steps responsible for the auto-oxidation of polyethylene that result in the degradation of polyethylene properties. These three steps were free-radical initiation, propagation and termination. 

Block copolymers of polyethylene and ethylcellulose have also been prepared by Vasiliu-Oprea and Simionescu using a Brabender Plastograph [133]. The influence of polymer ratio and reaction temperature has been investigated as was the changes in polyethylene properties (mechanical, electrical, thermal, and solubility). The reaction mechanism follows. Chain scission of polyethylene leads to... 

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