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Investigation of 1,1‐diphenylethylene Oligomerization in the End‐Capping Reaction of Poly(styryl)lithium
Author(s) -
Quirk Roderic P.,
Garces Camila,
Dabney David,
Polce Michael J.,
Wesdemiotis Chris
Publication year - 2011
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201151010
Subject(s) - chemistry , lithium (medication) , mass spectrometry , desorption , size exclusion chromatography , isotopes of lithium , lewis acids and bases , anionic addition polymerization , polymer chemistry , matrix assisted laser desorption/ionization , nuclear magnetic resonance spectroscopy , polymer , ion exchange , organic chemistry , copolymer , catalysis , ion , chromatography , enzyme , endocrinology , medicine , adsorption
Summary: The possible oligomerization of 1,1‐diphenylethylene (DPE) in the end‐capping reaction of poly(styryl)lithium (PSLi) was studied in hydrocarbon solvents using excess DPE (≤16 mol‐eq); the effect of addition of THF (30 mol‐eq Lewis base) and extended times of reaction (8‐24 h) were also investigated. The characterization of the polymers was made by size exclusion chromatography (SEC), proton nuclear magnetic resonance spectroscopy (1H NMR) and matrix‐assisted laser desorption/ionization time of flight mass spectrometry (MALDI‐TOF MS). MALDI‐ TOF mass spectrometric results revealed the absence of DPE oligomerization under the reaction conditions used in this study.