Polyethylene continued

Fig. 3.7. Some of the common twins seen for polyethylene. Continuous and dashed lines depict (110) and (100) growth faces respectively...

Polyolefins - Polyolefins such as polypropylene and polyethylene continue to attract widespread interest. A number of interesting papers have appeared on... 

Ungar G (1986) From plastic-crystal paraffins to liquid-crystal polyethylene Continuity of the mesoi se in hydrocarbons. Macromolecules, 19 1317... 

Table 4.4 Effect of Density on the Permeability of Oxygen and Water in Polyethylene (continued)...

Polyethylene (continued) carbon dioxide and n-pentane 2003ZH2... 

In November 1937, ICl started up a 9 litre reaction vessel that could produce about 10 tons per annum [tpa] of polyethylene. Continuous operation was not achieved until the first ton of polyethylene was made on 22 December 1938. We might say that the polyolefin industry had begun ... 

When chlorination is carried out in solution it would seem, from a study of infra-red techniques, that the chlorination process is reasonably random and uniform (see discussion by Makowski, 1969). Where the chlorination occurs with the polyethylene in a slurry or a gel form (i.e. swollen but not dissolved in solvent) the chlorination is more uneven. This is because some of the polyethylene continues to contain some crystalline regions in which chlorination is very difficult, most of the reaction occurring in the amorphous or swollen amorphous regions. 

Figure 4 The constant volume apparent activation energy as a function of chain length (for alkanes) or lamellar thickness (for polyethylenes). Continuous line is that from the theory for chain rotation accompanied by twisting (after Mansfield and...

Polyethylene continued to be used as an insulator in the electrical field. Improvements in available grades enlarged its market share as it became usable for insulating cables for carrying ever higher loads. 

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