Search results for "Mono"

1982

N-Ethylaziridine (1) was polymerized in water with HCl as initiator and copolymerized with N-(2-hydroxyethyl)aziridine (2). Rapid propagation and termination reactions were observed. The maximum yield increases with the initiator concentration, whereas the molecular weight decreases. This is due to the difference in basicity between the tertiary N-atoms of the two monomers and the tertiary and the terminal secondary N-atoms of the polymers, which causes tranfer and termination reactions. Macrocycles with a side chain on a quaternary N-atom are formed. During the copolymerization, the more basic 1 is preferentially incorporated into the copolymer chain. The copolymerization parameters can be…

Solid-Phase Synthesis of Oligo(p-benzamide) Foldamers

2006

[reaction: see text] A coupling protocol has been developed which allows the synthesis of oligo(p-benzamide)s on solid support. Aromatic carboxylic acids are activated in situ with thionyl chloride and used to acylate secondary aromatic amines. N-p-Methoxy benzyl (PMB) as well as N-hexyl protected monomers were investigated. Heterosequences of both monomers were synthesized. Such nanoscale objects are important building blocks for supramolecular chemistry.

Polymere 3-acryloyloxyalkyl- und 3-acryloyloxyaryl-4-thiazolidone als strahlenschutzsubstanzen

1977

The syntheses of 3-acryloyloxyalkyl- and 3-acryloyloxyaryl-2-phenyl-4-thiazolidones (3a–c) from the corresponding hydroxyl derivatives 2a–c and acrylic acid chloride are described. These monomers were homopolymerized and copolymerized with N-vinyl-2-pyrrolidone by radical initiation. The resulting water soluble copolymers were tested in animals for radioprotective activity and prolongation of efficiency.

Versuche zur Öltrocknung an Modellverbindungen. Die gemeinsame Autoxydation von Styrol und substituierten Styrolen

1962

Die gemeinsame Autoxydation von Styrol und p-substituierten Styrolen wird als Copolymerisation aufgefast. Aus der Zusammensetzung der copolymeren Peroxyde wird uber die Copolymerisations-Parameter auf die Reaktivitat der Peroxy-Radikale und Monomeren geschlossen. Die verschiedenen p-substituierten Styrolperoxy-Radikale zeigen eine unterschiedliche Reaktivitat gegenuber Styrol. Diese Methode erlaubt auch die Reaktivitaten ungesattigter Fettsaureester und der entsprechenden Peroxy-Radikale zu erfassen. Studies on Drying Oils with Model Substances. The Combined Autoxydation of Styrene and Substituted Styrenes The combined autoxidation of styrene and p-substituted styrenes is a copolymerization…

Die thermische Polymerisation von Methylmethacrylat, 1. Polymerisation in Substanz

1978

Special purification of the monomer and careful preparation of the reaction setup allowed a thorough study of the spontaneous thermal polymerization of methyl methacrylate over a wide range of temperatures (0–140°C). The rates of polymerization are notably lower than the few data previously reported in literature, and the degrees of polymerization slightly higher. The thermal initiation reaction is superimposed by radical production due to the natural ionising radiation (cosmic radiation etc.). This additional initiation becomes significant at temperatures below 60°C. New and more reliable monomer chain transfer constants are given.

Komplexbildung von acrylnitril mit AgNO3 und initiierung der lichtsensibilisierten polymerisation. Zur polymerisation von acrylnitril mit AgNO3, 4. M…

1968

Es wird uber die Komplexbildung von Acrylnitril (AN) mit AgNO3 berichtet, und die experimentellen Ergebnisse werden kinetisch ausgewertet; die Annahme, das im Falle des AN die Initiierung aus einem Komplex des Monomeren mit dem Salz erfolgt, wird enhartet. Daraber hinaus hangt die Polymerisationsgeschwindigkeit von der Wellenlaange des eingestrahlten Lichts ab. fur den Initiierungsmechanismus wird eine Reduktion des Metallions mit gleichzeitiger Bildung eines NO3-Radikals vorgeschlagen, das den eigentlichen Initiator darstellt. The complex formation of acrylonitrile (AN) and AgNO3 is discussed and kinetically evaluated; the assumption that in case of AN the initiation occurs from a complex …

1977

The reaction of ethylene glycol, 1,4-butanediol, 1,6-hexanediol, 3,6-dioxaoctane-1,8-diol (triethylene glycol), poly(ethylene oxide)s with Mn = 300,1000 and 3000, or with poly(propylene oxide)s with Mn = 425 and 2000 in excess with AIBN leads to the corresponding bis(hydroxyalkyl) 2,2′-azodiisobutyrates (1a–i). These initiators are suited to synthesize telechelics. With equimolar amounts of AIBN and 3-oxapentane-1,5-diol (diethylene glycol), poly(ethylene oxide)s with Mn = 300, 1000 and 12000, poly(propylene oxide) with Mn = 425, or with poly(tetrahydrofuran) with Mn = 1000 and 2000 polymeric azoinitiators of structure 2 are formed. Blockcopolymers may be synthesized by means of these polym…

Topochemical reactions of monomers with conjugated triple bonds. III. Solid-state reactivity of derivatives of diphenyldiacetylene

1971

Über die polymerisation von p-jodstyrol

1962

Die radikalische Polymerisation von p-Jodstyrol wird in Substanz und in benzolischer Losung untersucht. Die Poly-p-jodstyrole lassen sich durch Austausch des Jods gegen Lithium und anschliesende Hydrolyse quantitativ in Polystyrole uberfuhren; deren Polymerisationsgrade konnen in bekannter Weise viskosimetrisch bestimmt werden. Dadurch ist die Aufstellung einer Viskositats-Polymerisationsgrad-Beziehung fur Poly-p-jodstyrol auf indirektem Wege durch polymeranaloge Umsetzung von Poly-p-jodstyrol zu Polystyrol moglich. Aus kinetischen Messungen wird die Ubertragungskonstante des monomeren p-Jodstyrols zu 1,9·10−4 bestimmt. Fur die Copolymerisation von Styrol und p-Jodstyrol bei 50°C gelten fol…

1987

Liquid-crystalline copolymers with covalently attached dichroic dyes were synthesized and characterized. Copolymers with high anthraquinone and trisazo-dye content were obtained by copolymerization of dye monomers with 4-cyanophenyl 4-(6-acryloyloxyhexyloxy)benzoate (1) and 6-acryloyloxyhexyl 4-(trans-4-propylcyclohexyl)benzoate (2). Particular attention is given to the influence of the dye content and the dye structure on the liquid-crystalline behavior of the copolymers.