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Star-shaped polymers were first reported by John Schaefgen and Paul Flory in 1948 while studying multichain polymers; they synthesized star-shaped polyamides. [9] The next major publication regarding star-shaped polymers was in 1962 by Maurice Morton et al. [10] Their research presented the first study demonstrating a method to create well-defined star-shaped polymers; this route was through ...
A star-shaped polymer molecule is a branched polymer molecule in which a single branch point gives rise to multiple linear chains or arms. If the arms are identical the star polymer molecule is said to be regular. If adjacent arms are composed of different repeating subunits, the star polymer molecule is said to be variegated.
Branch point in a polymer. Polymer architecture in polymer science relates to the way branching leads to a deviation from a strictly linear polymer chain. [1] Branching may occur randomly or reactions may be designed so that specific architectures are targeted. [1] It is an important microstructural feature.
Branched polymers with the same molecular weight usually demonstrate different physical properties due to that branching could generally decrease the van der Waals interactions between each of the polymer chain. Several well-known branched polymers have been synthesized, such as star-shape polymer, comb polymer and dendrimer.
Countless polymers can be used for star arms. Polyphenylakyne polymers can be used as an example since they give photoemitting macromolecules when grafted onto fullerene. C 60 -poly(1-phenyl-1-propyne) can be prepared via wolfram-catalyzed metathesis reaction connecting prepared poly(1-phenyl-1-propyne) onto the fullerene by carbene addition ...
Jay-Z, the star rapper and entrepreneur whose real name is Shawn Carter, was accused in a lawsuit Sunday of raping a 13-year-old girl in 2000 allegedly along with Sean “Diddy” Combs.
The "Food Wish Method": Chef John's Mathematical Formula for Cooking Prime Rib. Multiply the exact weight of your prime rib by 5 minutes (round up to the nearest minute).
The polymers that are typically used to make the polymer based macromolecular cages are made with star shaped polymers or nonlinear polymer precursors. [3] [2] [4] The molecular size of the polymeric macromolecular cage is controlled by the molecular weight of the star-shaped polymer or branched polymer. The macromolecular cages made from non ...