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Acyclic polymers containing a large number of isoprene subunits, usually unsaturated.
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3, respectively; therefore, both variables should be maintained at high levels in order to produce low DSV polyisoprenes.
The goal of preparing synthetic polyisoprene as a potential replacement for natural rubber was vigorously pursued in the early 1950s and 1960s by several laboratories in the United States.
Key statement: Branched synthetic polyisoprenes are described having a macrostructure and a microstructure very similar to those of natural rubber.
and at a concentration of said polyisoprene in toluene of 0.
Key statement: A sulfur-vulcanizable rubber composition usable for the manufacture of tires, based on at least: (A) one diene elastomer selected from the group consisting of polybutadienes, natural rubber, synthetic polyisoprenes, butadiene copolymers, isoprene copolymers and mixtures of these elastomers (component A); (B) a reinforcing white filler (component B); (C) a coupling agent (white filler/diene elastomer) bearing at least one activated double ethylene bond (component C), with which there is associated: (D) between 0.
47) Structural development of polyisoprenes during uniaxial stretching by in-situ synchrotron WAXD and SAXS.
11), and defect structures in polyisoprenes (head-to-head and tail-to-tail structures) were studied by Hackathom and Brock in 1971 (ref.
Natural rubber is polyisoprene, and when pyrolyzed yields large amounts of the monomer (isoprene), the dimer (dipentene) and higher oligomers.
PBD-8 contains 8% 1,2 units) and for the polyisoprenes indicates the molecular weight (i.
Blends containing very high 1,2, contents had extremely broad Tgs much closer to the polyisoprene Tg.
The full biosynthesis or polymerization to yield natural polyisoprene is illustrated in figure 1 (refs.
For comparative purposes, synthetic polyisoprene prepared with an Al-Ti catalyst has a microstructure of around 99% cis-1,4, up to 0.