Synthesis, solution properties and NMR spectroscopy of some polybetaines

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" Synthesis, solution properties and NMR spectroscopy of some polybetaines "
M. M. Ali

Document Type	:	Latin Dissertation
Language of Document	:	English
Record Number	:	1112876
Doc. No	:	TLpq304479312
Main Entry	:	M. M. Ali
Title & Author	:	Synthesis, solution properties and NMR spectroscopy of some polybetaines\ M. M. Ali
College	:	King Fahd University of Petroleum and Minerals (Saudi Arabia)
Date	:	1998
student score	:	1998
Degree	:	M.S.
Page No	:	122
Abstract	:	The quaternary ammonium salt N,N-diallyl-N-(ethoxycarbonyl)methyl-N-(methoxycarbonyl)pentyl ammonium chloride on cyclopolymerization in aqueous medium using t-butyl hydroperoxide as free radical initiator gave the corresponding homopolymer. The copolymer of this quaternary ammonium monomer with sulfur dioxide was prepared in DMSO using ammonium persulfate as the initiator. The homopolymer and copolymer were converted to polybetaines by acidic hydrolysis of ester functionality present on the repeat unit. These polybetaines represent a new class of polymers since they possess a zwitterionic moiety as well as a free electrolytic ion pair on each repeat unit. They possess structural features common to polyampholytes and conventional polyelectrolytes. It is therefore of interest to determine what effect this special structural feature would have on their solubility and solution properties. A zwitterionic monomer 3-(N,N-diallyl-N-methoxycarbonyl pentyl) ammoniopropane-sulfonate was prepared and its free radical polymerization in aqueous medium using t-butyl hydroperoxide as the initiator gave a conventional polybetaine. A preliminary investigation of its solubility behavior suggested that this polybetaine possesses polyampholytic properties. H, C, DEPT, COSY and CHSHF NMR techniques were used extensively to elucidate the structures of these new monomers and polymers.
Subject	:	Polymers
	:	Pure sciences