By Jaques Roovers
The 2 better half volumes of Advances in Polymer technology numbers 142 and 143 take care of smooth points of long-chain branching in artificial polymers. The long-chain structure is now more and more used as a layout instrument for targetted polymer houses. the artificial elements disguise branching through cationic polymerization, uneven branching, poly(macromonomers), dendrimer-polymer hybrids and hyperbranched polymers. 3 contributions hide idea and simulation of branching, answer houses, and soften move of branched polymers, respectively.
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Extra resources for Branched Polymer I
Charleux, R. Faust The coupling efficiency also depended on the length of the polymeric chain, the shorter being the more efficient. Moreover, a chloride counteranion was preferred due to the high affinity of silicon to chlorine. A tri- and a tetrafunctional coupling agent respectively 24 and 25 , both completely soluble in organic solvents, were then designed in order to obtain high yield of coupling of living poly(IBVE). The electron-donating alkoxyphenyl group in the a position enhanced the reactivity of the double bond and the radially shaped structure with rigid phenyl spacers led to well-separated reactive functions suitable for minimizing the steric hindrance previously observed with the malonate derivatives.
By quantitative dehydrochlorination, three arm star PIB carrying three -CH2C(CH3)=CH2 termini could be prepared. This end group in turn could be quantitatively converted to a variety of other valuable functionalities, for instance to primary -OH groups by hydroboration followed by alkaline oxidation. By these functionalization reactions, well documented in , star PIBs with different terminal functionality could be obtained. The conventional batch technique suffers from a number of limitations.
3 Poly(isobutylene-b-p-methylstyrene)n Well defined three arm star block copolymers were prepared by sequential block copolymerization of IB with p-methylstyrene (p-MeS) . First IB was polymerized by the 14/TiCl4 initiating system in CH3Cl/hexanes (40/60 v/v) at –80 °C in the presence of the proton trap DTBP. When the polymerization was complete the living PIB chain ends were capped with 1,1-diphenylethylene. Subsequently, titanium(IV)isopropoxide was added to decrease the Lewis acidity and p-MeS was introduced.
Branched Polymer I by Jaques Roovers