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Synthesis of ring-shaped macromolecules

โœ Scribed by G. Hild; A. Kohler; P. Rempp

Publisher
Elsevier Science
Year
1980
Tongue
English
Weight
248 KB
Volume
16
Category
Article
ISSN
0014-3057

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โœฆ Synopsis

Ring-shaped macromolecules have been synthesized by the reaction of a bifunctional "'living" polystyrene with a stoichiometric amount of dibromo-p-xylene, at very low concentration. The reaction is carried out step by step, leading both to the expected cyclic polymer and to a "polycondensate'. Fractionatal precipitation and one-step fractionation lead to well defined macrocycles of known size.

๐Ÿ“œ SIMILAR VOLUMES

Cyclic macromolecules. Synthesis and cha
Cyclic macromolecules. Synthesis and characterization of ring-shaped polystyrenes
โœ G. Hild; C. Strazielle; P. Rempp ๐Ÿ“‚ Article ๐Ÿ“… 1983 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 506 KB

A~tract--A method has been developed to synthesize cyclic polystyrene molecules, by reacting bifunctional "living" polystyrene with ~,~' dibromo-p-xylene. The ability of the method to yield cyclic polymers over a molecular weight range from 7000 to 250,000 has been thoroughly investigated and discus

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โœ Gaoyuan Wei ๐Ÿ“‚ Article ๐Ÿ“… 1997 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 251 KB ๐Ÿ‘ 1 views

The shapes and sizes of linear and circular multiple-ring macromolecules in the framework of the Gaussian model have been numerically investigated in terms of shape factors, asphericity and prolateness factors and parameters, and shrinking factors. Simple analytic expressions for the eigenpolynomial

Characterization of ring-shaped polystyr
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โœ He Zhiduan; Yuan Meina; Zhang Xuanqi; Wang Xiaobing; Jin Xiaoming; Huang Jiaxian ๐Ÿ“‚ Article ๐Ÿ“… 1986 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 266 KB

A~tract--Fractions of ring-shaped polystyrene (RPS) of high molecular weight, and comparable samples of linear polystyrene (LPS), were characterized by gel permeation chromatography combined with laserlight scattering and by dilute solution viscometry. The ratio of intrinsic viscosities, g = [q],/[q