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• W2094173890 abstract "Propylene sulphide is polymerized by zinc and cadmium thiolates, the latter being particularly active initiators. The polymerizations are non-terminating and there is a period of accelerating rate after which the rates are first order in monomer and initiator. The monomer is considered to be coordinated to the metal atom in the propagation reaction. Thiols are chain transfer agents and, dependent on the amount and functionality of the thiol, the molecular weight and branching in the polymer can be controlled. On a polymérisé le sulfure de propylène à l'aide de thiolates de zinc et de cadmium qui sont des agents d'amorçage particuliérement actifs. Ces polymérisations se font sans terminaison. On observe au début une période accélérée puis les vitesses sont de premier ordre par rapport au monomére et à l'agent d'amorçage. On admet qu'au cours de la propagation, le monomére est coordonné à l'atome de métal. Les thiols sont des agents de transfert aussi en agissant sur la concentration et la fonctionalité du thiol on peut contrōler la masse moléculaire et le degré de ramification du polymére. II solfuro di propilene è polarizzato da tiolati di zinco e cadmio, gli ultimi essendo iniziatori particolarmente attivi. I polimeri sono del tipo non terminante e c'è un periodo di velocità crescente dopo il quale le velocità sono del primo ordine nel monomero e nell'iniziatore. II monomero si considera coordinato all'atomo del metallo nella reazione di propagazione. I tioli sono agenti per il trasferimento della catena e, dipendendo dalla quantità e dalla funzionalità del tiolo, possono essere controllati il peso molecolare e la ramificazione nel polimero. Propylensulfid wird mit Zink-und Cadmiumthiolaten polymerisiert; letztere sind besonders aktive Initiatoren. Die Polymerisationen verlaufen ohne Abbruch, und nach einer anfänglichen Reaktionsbeschleunigung sind die Geschwindigkeiten erster Ordnung in Bezug auf Monomeres und Initiator. Es wird angenommen, daβ das Monomere bei der Wachstumsreaktion in Koordination zum Metallatom steht. Thiole sind kettenübertragende Agentien und, in Abhängikeit von der Menge und Funktionalität des Thiols, läβt sich das Molekulargewicht und der Verzweigungsgrad des Polymeren kontrollieren." @default.
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• W2094173890 date "1969-02-01" @default.
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• W2094173890 title "Initiators for the polymerization of propylene sulphide" @default.
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• W2094173890 doi "https://doi.org/10.1016/0014-3057(69)90105-0" @default.
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