29.05.2021 | History

5 edition of Etude de lamorçage du greffage de monomères vinyliques sur divers substrats chlorés found in the catalog.

Etude de lamorçage du greffage de monomères vinyliques sur divers substrats chlorés

ricerche sui luoghi del lavoro a Cesena nei secoli XV-XIX

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Published by Administrator in Institut français du pétrole

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      • Bibliography: p. 111-113.Thesis (doctoral)--Université Pierre et Marie Curie, Paris 6, 1979.

        StatementInstitut français du pétrole
        PublishersInstitut français du pétrole
        Classifications
        LC Classifications1980
        The Physical Object
        Paginationxvi, 87 p. :
        Number of Pages49
        ID Numbers
        ISBN 10nodata
        Series
        1nodata
        2
        3

        nodata File Size: 9MB.


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Eine Untersuchung der Aufpropfung von MAM und von AN zu PVC Filmen, welche vorher unter Vakuum und in der Gegenwart von Luft bestrahlt wurden. Thus, the peroxidation of PVC does not proceed by a chain process. The mobility of the polymeric chain is increased and peroxidation can occur by a chain process. Grafting of MAM and ANon PVC films which have previously been irradiated under vacuum or in the presence of air have been studied.

I risultati suggeriscono che l'irradiazione di PVC nella presenza d'aria porta ad una perossidazione di catena corta con la formazione di idroperossidi. The results as a whole suggest that irradiation of PVC in the presence of air leads to a peroxidation in a short chain with the formation of hydroperoxides. Diese Erscheinung ist einem Abbau zugeschrieben, welcher von den gebildeten Superoxyden veranlasst wird.

L'irradiazione in presenza d'aria fa ottenere dei radicali ma anche dei perossidi che sono stati formati. The velocity of grafting increases at first with the amount of pre-irradiation, but shows a sharp maximum towards 3 Mrads and then decreases. When PVC is swollen in chloroform and dried in vacuo, some solvent remains occluded and plasticizes the polymer. Irradiation in the presence of air leads to some entrapped radicals but also to some peroxides.

Greffage du methacrylate de methyle et de l'acrylonitrile sur des films de poly (chlorure de vinyle) preirradies

Dopo l'irradiazione sotto vuoto i films PVC assorbono dei radicali che iniziano il congiungimento e che non causano alcuna omopolimerizzazione. This phenomenon is attributed to induced decomposition of the peroxides formed. The steady state is not reached during this process because at the temperature used slightly below T v of the polymerthe propagation and termination steps of the peroxidation reaction are very slow; hydroperoxidation goes on after irradiation.

L'etude des differents parametres de la reaction de…. La quota di congiungimento raggiunge un limite ad un ammontare di preirridazione di circa 1 Mrad.

It was found that the grafting rate connected with hydroperoxide concentration of unplasticized films does not depend on either the preirradiation temperature nor the dose rate. Le greffage de l'aubergine, mais egalement de la tomate, sur porte-greffes selectionnes d'aubergine et de tomate permet de limiter les problemes d'asphyxie racinaire et l'incidence negative des maladies du sol sur la….

Etude de l'influence du greffage sur la production de tomate cultivée sous abri en pleine terre à Mayotte

Connaissant les proprietes d'inclusion et de greffage des cyclodextrines CDsnous avons etabli le concept d'une prothese vasculaire modifiee par les CDs qui libererait un antibiotique AB pednant une duree prolongee. Biology La production de legumes est rendue difficile pendant la saison chaude et humide a cause des fortes pluies sols detrempes et inondesdes temperatures et hygrometries elevees perturbation de la nouaison et des maladies qui peuvent limiter considerablement le rendement.

Di conseguenza la perossidazione del PVC non procede per processo a catena. Die Geschwindigkeit der Aufpropfung nimmt zuerst mit einer Dosierung von Vorbestrahlung zu, aber sie muss mit einem exakten Minimum von 3 Mrads vorhanden sein und nimmt nachher ab.

The rate of grafting attains a limit at an amount of pre-irradiation of about 1 Mrad. Quando il PVC viene fatto gonfiare in cloroformio e diseccato sotto vuoto, un po' di solvente rimane incluso e plastifica il polimero. The reaction continues for a very long time at constant velocity.