✦ LIBER ✦

A new method for producing optically active polybutadiene

✍ Scribed by Mallakpour, Shadpour E.; Hajipour, Abdol-Reza; Khoee, Sepideh; Sheikholeslami, Bahram

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 187 KB
Volume: 47
Category: Article
ISSN: 0959-8103
DOI: 10.1002/(sici)1097-0126(1998100)47:2<193::aid-pi48>3.0.co;2-j

No coin nor oath required. For personal study only.

✦ Synopsis

The anionic polymerization of butadiene monomer in cyclohexane at 20¡C gave polybutadiene (PB50) with a narrow molecular weight distribution. This polymer was allowed to react with 4-phenyl-1,2,4-triazoline-3,5-dione via the "eneÏ reaction to the extent of 5, 10 and 15%. These functionalized polymers were reacted with N-phthaloyl-L-leucine acid chloride in the presence of pyridine at room temperature. These reactions lead to the replacement of N-H by an optically active group, and the resulting polymers became optically active. Some structural characterization and physical properties of these optically active polybutadienes are reported.

📜 SIMILAR VOLUMES

New method for preparing polybutadiene r

New method for preparing polybutadiene rubber/clay composites

✍ Shaohui Wang; Yong Zhang; Zonglin Peng; Yinxi Zhang 📂 Article 📅 2005 🏛 John Wiley and Sons 🌐 English ⚖ 274 KB 👁 1 views

New method for producing high-performanc

New method for producing high-performance thermoplastic polymeric foams

✍ Don K. Brandom; José P. Desouza; Donald G. Baird; Garth L. Wilkes 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 197 KB 👁 1 views

A new method for the production of foamed thermoplastic polymers from blends of a poly(aryl ether ketone) (PAEK) and polyetherimide (PEI) is presented. The blowing agent for the foaming process is water which is produced at elevated temperatures in an extruder, via an in situ reaction between an ami

A new process for producing polyamide fr

A new process for producing polyamide from polyester

✍ Seiko Nakano; Tadaya Kato 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 315 KB 👁 1 views

A new process for producing polyamide from polyester and diamine was proposed. An attempt was made to produce polyamide 6T from polyethyleneterephthalate or dimethylterephthalate with hexamethylenediamine in water, o-dichlorobenzene and sulfolane. Characterization of the products by IR, elemental an

Evidence for a new transition in polyrib

Evidence for a new transition in polyribonucleotides from raman optical activity

✍ Alasdair F. Bell; Lutz Hecht; Laurence D. Barron 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 88 KB 👁 1 views

Vibrational Raman optical activity (ROA) measurements are reported on single-stranded poly(rA) and double-stranded poly(rA)•poly(rU) in the temperature range 2 -45 • C. The intensities of one ROA couplet in poly(rA) (centred at ca 1329 cm -1 and sensitive to sugar-base conformation) and three in pol

A new method for the determination of op

A new method for the determination of optical purity of synthetic peptides

✍ Shoichi Kusumoto; Masayuki Matsukura; Tetsuo Shiba 📂 Article 📅 1981 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 345 KB 👁 2 views

## Abstract A novel and very accurate method was established for the determination of the optical purity of a peptide by use of the following procedure: (1) hydrolysis of the peptide in deuterium chloride, (2) gas chromatographic separation of each amino acid enantiomer on a chiral phase, and (3) d

A New Method for Addition of Aldehydes t

A New Method for Addition of Aldehydes to Activated Double Bonds

✍ Prof. Dr. Hermann Stetter; Manfred Schreckenberg 📂 Article 📅 1973 🏛 John Wiley and Sons 🌐 English ⚖ 103 KB 👁 2 views