Synthesis of Liquid Crystalline Polyesters of Various Types by Acyclic Diene Metathesis Polymerization

Autor:	Wang-Cheol Zin, Dae-Cheol Kim, Sung-Hoon Joo, Jung-Il Jin, Yong-Kuk Yun
Rok vydání:	2000
Předmět:	Materials science Polymers and Plastics Bulk polymerization Organic Chemistry Solution polymerization Chain transfer Step-growth polymerization Inorganic Chemistry Polyester Chain-growth polymerization Polymerization Polymer chemistry Materials Chemistry Organic chemistry Acyclic diene metathesis
Zdroj:	Macromolecules. 33:6704-6712
ISSN:	1520-5835 0024-9297
DOI:	10.1021/ma0005926
Popis:	A series of liquid crystalline polyesters of different types were prepared by the acyclic diene metathesis polymerization method. These polymers are of main-chain, side-chain, and combined types. Polymerizations were conducted at 25-50 °C either in solution or in bulk using the so-called Grubbs' catalyst, bis(tricyclohexylphosphine)benzylideneruthenium dichloride. The monomers utilized in this investigation are all isolated dienes containing a built-in aromatic type mesogenic unit or an aromatic ester type mesogen bearing the cholesterol pendant through oxydodecyloxy spacer or monomesogenic terephthalate ester unit bearing the cholesterol pendant through a spacer. Bulk polymerization produced higher MW polymers than solution polymerization as expected from the known polymerization mechanism. Liquid crystallinity and phase transition properties of obtained polymers were studied by differential scanning calorimetry, optical microscopy, and X-ray diffraction.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ab15e5021ee38dc7a62b7f3fb072f81a https://doi.org/10.1021/ma0005926 Zobrazit plný text záznamu