Linear low density polyethene

We have studied the alkane and alkene yields from the radiolysis of copolymers of ethylene with small amounts of propylene, butene and hexene. These are examples of linear low density polyethenes (LLDPE) and models for LDPE. Alkanes from Ct to C6 are readily observed after irradiation of all the polymers in vacuum. The distribution of alkanes shows a maximum corresponding to elimination of the short-chain branch. This is illustrated in Figure 8 for the irradiation of poly (ethylene-co-1-butene) containing 0.5 branches per 1,000 carbon atoms at 20 C. 

On a laboratory scale, single site catalysts based on metallocene/MAO are highly useful for the copolymerization of ethene with other olefins. Propene, 1-butene, 1-pentene, 1-hexene, and 1-octene have been studied in their use as comonomers, forming linear low-density polyethene (LLDPE) [188,189]. These copolymers have a great industrial potential and show a higher growth rate than the homopolymer. Due to thee short branching from... 

The main three polyethene classes are low-density polyethene (LDPE), high-density polyethene (HDPE), and linear low-density polyethene (LLDPE) (Scheme 6.20.1). Table 6.20.1 gives an overview of these classes and indicates the differences in density, production processes, and chemical structure. 

PE type Low-density polyethene Linear low-density polyethene (LLDPE) High density polyethene... 

Technical ethylene polymerization leads to three major classes of PE materials low-density polyethene (LDPE), linear low-density polyethene (LLDPE), and high-density polyethene (HOPE). The three classes of PE material differ in the degree and type of branching in the polymer. These differences lead to different physicochemical properties of the polymer, resulting in different application areas of the PE material. 

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