𝔖 Bobbio Scriptorium
✦   LIBER   ✦

New polymer syntheses, 79. Hyperbranched poly(ester-amide)s based on 3-hydroxybenzoic acid and 3,5-diaminobenzoic acid

✍ Scribed by Hans R. Kricheldorf; Gerd Löhden

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
606 KB
Volume
196
Category
Article
ISSN
1022-1352

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The reaction of 3‐acetoxybenzoyl chloride (4) with N,N′,O‐tris(trimethylsilyl)‐3,5‐diaminobenzoic acid (5) proceeds by highly selective and almost quantitative acylation of both amino groups. The resulting 3,5‐bis(3‐acetoxybenzamido)benzoic acid (6a), or its silylated derivative (6b), was polycondensed in bulk. The silylated monomer yielded the higher molecular weights. The condensation of 3,5‐diacetoxybenzoyl chlorides with diamines containing aliphatic protons yielded acetylated tetraphenols which served as “star centers” for polycondensation. The polycondensation of silylated 3,5‐bis(3‐acetoxybenzamido)‐benzoic acid (6b), with these “star centers” yieled in turn hyperbranched star polymers. The feed ratio of monomers and “star centers” allows the control of the molecular weight. ^1^H NMR spectroscopy of these hyperbranched star polymers was used to determine the average degree of polymerization (DP) and the average degree of branching (DB). ^1^H and ^13^C NMR spectroscopy also revealed that all polycondensations involve a significant extent of ester‐amide interchange reactions.

📜 SIMILAR VOLUMES

New polymer syntheses, 91. Hyperbranched
New polymer syntheses, 91. Hyperbranched poly(ester-amide)s derived from 3,5-dihydroxybenzoic acid and 3,5-diaminobenzoic acid
✍ Hans R. Kricheldorf; Oliver Bolender; Thomas Stukenbrock 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 618 KB

## Abstract A new pentafunctional monomer (3a) was prepared by acylation of silylated 3,5‐diaminobenzoic acid (DABA) with 3,5‐bisacetoxybenzoyl chloride. The polycondensation of this monomer or its trimethylsilyl ester yielded a hyperbranched poly(ester‐amide) having a nearly alternating sequence o

New polymer syntheses. XCVII. Hyperbranc
New polymer syntheses. XCVII. Hyperbranched LC-polyesters based on β-(4-hydroxyphenyl)propionic acid and 4-hydroxybenzoic acid
✍ Hans R. Kricheldorf; Thomas Stukenbrock; Christian Friedrich 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 353 KB

Two classes of liquid crystalline hyperbranched copolyesters were prepared by the copolycondensation of silylated 3,5-bis(acetoxy)benzoic acid with mixtures of mesogenic difunctional monomers. The first class of LC-copolyesters was obtained from 1 : 1 mixtures (molar ratio) of silylated b-(4-acetoxy

New optically active poly(amide-imide)s
New optically active poly(amide-imide)s based on N,N′-(pyromellitoyl)-bis-L-amino acid and 1,3-bis(4-aminophenoxy) propane: Synthesis and characterization
✍ Khalil Faghihi 📂 Article 📅 2008 🏛 John Wiley and Sons 🌐 English ⚖ 368 KB 👁 2 views

## Abstract Five new poly(amide‐imide)s **8a–e** were synthesized through the direct polycondensation reaction of five chiral __N__,__N__′‐(pyromellitoyl)‐bis‐L‐amino acids **3a–e** with 1,3‐bis(4‐aminophenoxy) propane **7** in a medium consisting of __N__‐methyl‐2‐pyrrolidone, triphenyl phosfite,

Preparation of a new chiral stationary p
Preparation of a new chiral stationary phase for HPLC based on the (R)- 1-phenyl-2-(4-methylphenyl)ethylamine amide derivative of (S)-valine and 2-chloro-3,5-dinitrobenzoic acid: Enantioseparation of amino acid derivatives and pyrethroid insecticides
✍ Xulin Tan; Shicong Hou; Jingli Jiang; Min Wang 📂 Article 📅 2007 🏛 John Wiley and Sons 🌐 English ⚖ 456 KB 👁 1 views

## Abstract A novel chiral stationary phase (CSP) for HPLC was prepared by bonding (__R__)‐1‐phenyl‐2‐(4‐methylphenyl)ethylamine amide derivative of (__S__)‐valine to aminopropyl silica gel through a 2‐amino‐3,5‐dinitro‐1‐carboxamido‐benzene unit. The CSP was used for the separation of some amino a