𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Modeling of unsaturated polyester prepolymer structures. II. Hydroxyl and carboxyl functionalities

✍ Scribed by Y. S. Yang; J. P. Pascault

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
189 KB
Volume
64
Category
Article
ISSN
0021-8995

No coin nor oath required. For personal study only.

✦ Synopsis

Based on the structural model being derived in Part I, a statistics approach has been used to further estimate separately carboxyl and hydroxyl functionalities of unsaturated polyester (UP) prepolymers directly from their molecular parameters. This extended model shows satisfactory results when comparing with experimental results of hydroxyl functionality. The influence of molecular parameters, such as hydroxyl and carboxyl indexes, Ordelt saturation extent, and molecular mass polydispersity, on the carboxyl and hydroxyl functionalities is discussed. Examples showing the important impact of synthesis deviation on the hydroxyl and carboxyl functionalities, by model estimation, and, finally, on the SMC thickening are also discussed. ᭧ 1997

📜 SIMILAR VOLUMES

Modeling of unsaturated polyester prepol
Modeling of unsaturated polyester prepolymer structures. I. Chain branches and overall chain end numbers
✍ Y. S. Yang; J. P. Pascault 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 226 KB 👁 1 views

A review on the synthesis of unsaturated polyester (UP) prepolymers showed that Ordelt saturation (reaction of hydroxyl groups with double bonds) is the major effect that may cause formation of chain branches and then result in an uncertainty of chain end number or functionality. A model has been de

Quantitative determination of the distri
Quantitative determination of the distribution of free hydroxylic and carboxylic groups in unsaturated polyester and alkyd resins by 31P-NMR spectroscopy
✍ A. Spyros 📂 Article 📅 2001 🏛 John Wiley and Sons 🌐 English ⚖ 150 KB 👁 1 views

## Abstract Quantitative ^31^P‐NMR spectroscopy is used to measure the hydroxyl and carboxyl content of some polyester resins (short‐ and long‐oil alkyds, polyols, polyesters) through derivatization of the —OH protons with 2‐chloro‐4,4,5,5‐tetramethyldioxaphospholane I. This methodology is shown to

Model peptides mimic the structure and f
Model peptides mimic the structure and function of the N-terminus of the pore-forming toxin sticholysin II
✍ Fábio Casallanovo; Felipe J. F. de Oliveira; Fernando C. de Souza; Uris Ros; Yoh 📂 Article 📅 2006 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 493 KB

## Abstract To investigate the role of the N‐terminal region in the lytic mechanism of the pore‐forming toxin sticholysin II (St II), we studied the conformational and functional properties of peptides encompassing the first 30 residues of the protein. Peptides containing residues 1–30 (P1–30) and