Microcalorimetric investigation on the lower critical solution temperature behavior of N-isopropylcrylamide-co-acrylic acid copolymer in aqueous solution

Article Abstract:

The lower critical solution temperature (LCST) behaviors of random and segmented copolymers of N-isopropylcrylamide (NIPAM) and acrylic acid (AA) prepared in dioxane and water was investigated by using ultrasensitive microcalorimetry (US-DSC). The results show that long polyNIPAM (PNIPAM) segments favorable for clustering lead to a lower LCST indicating that the clustering of PNIPAM segments plays an important role in the LCST behavior of NIIPAM-co-AA copolymers.

All Other Basic Organic Chemical Manufacturing, Industrial Organic Chemicals, Acrylic Acid, Amides, Aqueous solution reactions, Chemical properties, Copolymers

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A proton nuclear magnetic resonance relaxation study of C(sub 12)E(sub 6)/D(sub 2)O

Article Abstract:

The spin-lattice relaxation rates measured for C(sub 12) E(sub 6)/D(sub 2)O as a function of composition, frequency, and temperature are consistent with the motions of lipid molecules in the structures. Review of the relaxation theory is presented with attention to molecular exchange.

Usage, Carbon, Nuclear magnetic resonance spectroscopy, Lipid research, NMR spectroscopy

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