Linear Low Density Polyethylene Production by Tandem Polymerization of Ethylene: Properties and Applications
Article Type:
Research/Original Article (ترویجی)
Abstract:
Linear low density polyethylene (LLDPE) is a linear polyethylene with considerable number of short branches that is produced by the copolymerization of ethylene with α-olefins such as 1-butene, 1-hexene and 1-octene. LLDPE has higher tensile strength and higher impact resistance than LDPE. It is very flexible and elongates under stress. It can be used to make thinner films, with better environmental stress cracking resistance. It is an important family of polyolefins, which has been widely used as thermoplastic polymers because of their combined stiffness and stress-crack resistance. Commonly, LLDPE is produced through a two-stage process including comonomer and copolymer formation in two separate reactors; though an alternative LLDPE preparation method that has attracted good attention among academic and industrial producers is tandem polymerization where one catalyst produces α-olefin in situ and another copolymerizes ethylene and α-olefin monomers. Compared to the commonly used two-stage processes, single-stage approach has a clear advantage in plant investment, α-olefin purification, storage, transport and reducing operational unit. Furthermore in tandem systems, the reactivity of the active sites must be well matched so that the product of one cycle does not overwhelm the overall tandem sequence. In this paper, a historical overview is provided on the developments in LLDPE production through tandem polymerization of ethylene.
Language:
Persian
Published:
Polymerization, Volume:7 Issue: 3, 2018
Pages:
15 to 25
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