Polymerization initiated with polymeric compounds, II

Abstract

The polymerization of methyl methacrylate initiated by the copolymers methacrylaldehydestyrenedivinylbenzene and acrylaldehydeethylene dimethacrylate in the absence of usual initiators was investigated. The polymerization was found to proceed fairly readily and fast. Acceleration can be achieved by adding glycerylaldehyde. An increase in the surface of the initiating copolymer favourably influences the reaction rate; at the same time, however, physical trapping of ungraft poly(methy1 methacrylate) molecules in the macroporous initiator seems likely to occur. It was also found that only copolymers containing aldehyde groups could be used for initiation and that besides MMA some other monomers could be polymerized in this way, such as glycidyl methacrylate, acrylic and methacrylic acid, acrylonitrile, and alkyl acrylate. ZUSAMMENFASSUNG:Die Polymerisation von Methylmethacrylat wurde untersucht, die durch Copolymere aus Methacrylaldehyd -Styrol -Divinylbenzol und Copolymere aus Acrylaldehyd -Athylendimethacrylat in Abwesenheit ublicher Initiatoren ausgelost wird. Die Polymerisation verlauft radikalisch und schnell. Eine Beschleunigung kann durch Zugabe von Glycerinaldehyd erreicht werden. Eine groBere Oberflache des initiierenden Copolymeren begunstigt die Reaktionsgeschwindigkeit, aber parallel dazu scheinen leicht Einschlusse von ungepfropften Polymethylmethacrylat-Molekulen aufzutreten. Es wurde gefunden, da13 nur Copolymere mit Aldehydgruppen als Initiatoren wirken und daB auch andere Monomere wie Glycidylmethacrylat, Acryl-und Methacrylsaure, Acrylnitril und Alkylacrylate polymerisiert werden konnen.

Methacrylate‐based chromatographic media

“…Figure 13 shows some of these chemical modifications. of diethylamino (DEA) groups proceeds using diethylamine [110 -112], strong basic quaternary ammonium functionalities were obtained by reaction with tertiary amines [113 -115], and a strongly acidic ion exchanger containing sulfonic acid groups results from reaction with sodium sulfite [116]. Since hydrolysis of the epoxide functionality yields diol, all modification reactions applicable to HEMA beads and shown in Fig.…”