Graded block and randomized copolymers of butadiene-styrene

Autor:	K. Sardelis, H.J. Michels, G. Allen, null F.R.S.
Rok vydání:	1984
Předmět:	Materials science Polymers and Plastics Organic Chemistry Infrared spectroscopy Microstructure Styrene Gel permeation chromatography chemistry.chemical_compound Monomer Polymerization chemistry Intramolecular force Polymer chemistry Materials Chemistry Copolymer
Zdroj:	Polymer. 25:1011-1019
ISSN:	0032-3861
DOI:	10.1016/0032-3861(84)90089-2
Popis:	Graded block and randomized copolymers of butadiene-styrene were prepared anionically by polymerizing a mixture of butadiene and styrene with n-BuLi, in the absence and in the presence of t-BuOK respectively. Determination of the monomer composition and microstructure of the poly-butadiene sequence was achieved by 300 MHz 1 H n.m.r. and infra-red spectroscopy. 1 H n.m.r. equations developed previously for butadiene-styrene copolymers were modified and extended. In this way, cis, trans butadiene contents were determined from the aliphatic region of the n.m.r. spectra. The monomer sequence distribution of the copolymers has been investigated by examination of the morphology and their dynamic mechanical properties. The experimental conditions have been established for the preparation of random copolymers with inter- and intramolecular composition distribution.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a63c8f37344c7f2ad730ae28ea001687 https://doi.org/10.1016/0032-3861(84)90089-2 Zobrazit plný text záznamu