Browsing by Author "P.N. Chaturvedi"

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Multiple melting due to secondary crystallization in polymers
(Kluwer Academic Publishers, 1992) P.N. Chaturvedi
[No abstract available]
On the structure-dilute solution properties relationship in substituted acrylamide polymers
(1991) Shashikant; C.K. Patel; P.N. Chaturvedi
Poly (N,o-methylphenylacryiamide) (PNOMPA) is prepared and fractionated by precipitation method. The fractions were characterized by viscometry, osmometry and gel permeation chromatography. The MHKS parameters were compared with other two polymers of the same class: poly (N-phenyl acrylamlide) (PNPA) and Poly (N, p-methylphenylacrylamide) (PNPMPA). The order of chain flexibility is found to be: PNOMPA < PNPMPA < PNPA. The cause for this is attributed to the decrease in hydrogen bonding by para and ortho methyl substitution. Further, the unperturbed dimensions of PNOMPA were worked out using Flory, Fox and schaefgen relation. © 1991, Taylor & Francis Group, LLC. All rights reserved.