Low-density polyethylenes. See

Low- and high-density polyethylene, polypropene, and polymers of other alkene (olefin) monomers constitute the polyolefin family of polymers. All except LDPE are produced by coordination catalysts. Coordination catalysts are also used to produce linear low-density polyethylene (LLDPE), which is essentially equivalent to LDPE in structure, properties, and applications (Sec. 8-1 lc). The production figures given above for LDPE do not include LLDPE. The production of LLDPE now exceeds that of LDPE, with about 10 billion pounds produced in 2001 in the United States. (Copolymers constitute about one-quarter of all low density polyethylenes see Sec. 6-8b.)... 

Practical Applications. IFP s Alphabutol process is used to dimerize ethylene selectively to 1-butene.43,85 The significance of this technology is the use of 1-butene as a comonomer in the polymerization of ethylene to produce linear low-density polyethylene (see Section 13.2.6). Under the reaction conditions applied in industry (50-60°C, 22-27 atm), the selectivity of 1-butene formation is higher than 90% at the conversion of 80-85%. Since no metal hydride is involved in this system, isomerization does not take place and only a small amount of higher-molecular-weight terminal alkenes is formed. 

In extension under conditions F — const, dependencies of total strain e and elastic strain a upon time t are measured as usual. In Refs. 11-13>15-35 38> these experiments were arranged with polyisobutylene samples with different molecular weights and with low-density polyethylene (see below). 

Elastomeric copolymer from acrylonitrile and chloroprene Low-density polyethylene (see also LDPE)... 

Octene n. C6Hi3CH=CH2. A co-monomer, made from ethylene, and polymerized with ethylene to make linear, low-density polyethylene See image). 

---