✦ LIBER ✦

Enthalpy relaxation in polymethyl(α-n-alkyl)acrylates: Effect of length of alkyl chain

✍ Scribed by Marie-Elodie Godard; Jean-Marc Saiter; Pilar Cortés; Salvador Montserrat; John M. Hutchinson; Fabrice Burel; Claude Bunel

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 236 KB
Volume: 36
Category: Article
ISSN: 0887-6266
DOI: 10.1002/(sici)1099-0488(199803)36:4<583::aid-polb5>3.0.co;2-q

No coin nor oath required. For personal study only.

✦ Synopsis

In this work, we have investigated by DSC the structural relaxation of amorphous polymethyl( a-n-alkyl)acrylates in which it is possible to change the length of the alkyl chain. We have evaluated the Narayanaswamy parameter, x, which controls the relative contribution of temperature and of structure to the relaxation time, the apparent activation energy, Dh*, and the nonexponentiality parameter, b, of the stretched exponential response function. The results suggest that x increases while Dh* decreases and b remains constant as the length of the side chain increases. This allows us to comment on the effect of chemical modification on the relaxation kinetics.

📜 SIMILAR VOLUMES

L-Tyrosine Ester-Mediated Photosensitize

L-Tyrosine Ester-Mediated Photosensitized Charge Separation – Length Effects of Alkyl Side Chains in Polymers and Alkyl Groups in L-Tyrosine Esters

✍ Masahiro Suzuki; Mutsumi Kimura; Kenji Hanabusa; Hirofusa Shirai 📂 Article 📅 2001 🏛 John Wiley and Sons 🌐 English ⚖ 124 KB 👁 2 views

Conformation of Polyelectrolyte Chains i

Conformation of Polyelectrolyte Chains in Dilute Aqueous Solutions Investigated by Conductometry, 2. Influence of Temperature, Chain Length and N-Alkyl Substituents on the Conformation of Exhaustively Alkylated Poly(N-alkyl-4-vinylpyridinium) Cations

✍ Olga V. Davydova; Alexander N. Zelikin; Sergei I. Kargov; Vladimir A. Izumrudov 📂 Article 📅 2001 🏛 John Wiley and Sons 🌐 English ⚖ 120 KB 👁 2 views

α-1-C-Alkyl-1-deoxynojirimycin Derivativ

α-1-C-Alkyl-1-deoxynojirimycin Derivatives as Potent and Selective Inhibitors of Intestinal Isomaltase: Remarkable Effect of the Alkyl Chain Length on Glycosidase Inhibitory Profile.

✍ Guillaume Godin; Philippe Compain; Olivier R. Martin; Kyoko Ikeda; Liang Yu; Nao 📂 Article 📅 2005 🏛 John Wiley and Sons ⚖ 22 KB 👁 1 views

The effect of feed conditions in the emu

The effect of feed conditions in the emulsion catalytic chain transfer polymerization of alkyl methacrylates

✍ David M. Haddleton; David R. Morsley; John P. O'Donnell; Stuart N. Richards 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 193 KB 👁 1 views

bis [-[(2,3-butanedione dioximato)(2-)-O:OЈ]] tetrafluorodiborato(2-)-N, NЈ,NЉ,Nٞ] cobalt), CoBF, has been used for the effective catalytic chain transfer of alkyl methacrylate homo-and copolymers under emulsion polymerization conditions. The catalytic chain transfer process reduces the rate of poly

ChemInform Abstract: Structure—Reactivit

ChemInform Abstract: Structure—Reactivity Relationships in the Rate of Esterification by Acetylimidazole: The Influence of the Second Hydroxy Group and of the Length of the N-ω-Hydroxy-n-alkyl Chain in 3-(N-Methyl,N-ω-Hydroxy-n-alkyl)amino-2-tert-butylpropan-1-ols.

✍ A. MADDER; P. J. DE CLERCQ; H. MASKILL 📂 Article 📅 2010 🏛 John Wiley and Sons ⚖ 34 KB