Abstract
Abstract Introduction LDPE is produced under high pressure (82–276 MPa) and high temperature (405–605 K) with a free radical initiator (such as peroxides and oxygen) and contains some long chain branches (LCB), which could be as long as chain backbones, and short chain branches (SCB).(3) It is produced by either a tubular or a stirred autoclave reactor.(4) The autoclave process can produce LDPE resins having a wide range of molecular weight distribution (MWD) and less LCB in comparison with a tubular reactor. Long chain branching has a strong influence on MWD, and hence on resin properties, such as processibility, melt strength, and film optical properties. SCBs disrupt chain packing and are principally responsible for lowering the melting temperature and the crystal density for hydrocarbon polymers. LDPE is commercially available in a wide variety of molecular weight, MWD, SCB, and LCB contents, and density ranges.
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