The copolymerization of monomethyl maleate (MMM) or monomethyl fumarate (MMF) with styrene is investigated. The dependence of the copolymerization rates on the composition of the monomer mixture and the monomer reactivity ratios r are determined. An identical structure of the MMM and MMF polymer radicals was found, that is the k,,-values of both copolymerization systems are equal (monomer 1 = styrene; monomer 2 = MMM or MMF).From this knowledge the difference of the copolymerization rates between MMM and MMF can be attributed to the k,,-values.
Herrn Prdfessor Dr. Dr. h. c. Hermann Hare zum 75. Geburtstag gewidrriet Das thermische Verhalten von Maleinsaurehalbester-Copolymeren, die durch Veresterung van MaleinsaureanhydridCopolymeren hergestellt wurden, und der Copolymere der Malein-sowie Fumarsaurehalbester wird untersucht. Daraus werden Ruckschlusse auf die Struktur der Copolymere gezogen. Die Schwierigkeiten bei der experimentellen Durchfuhrung der Cyclisierungsreaktion in Losung, die zur Umsetzung in der Festphase gefuhrt haben, werden beschrieben. Tepauueciioe noeeaenue u c m p p m y p a cononuaepoe nofiynya&~pos mcwceufioeoii u &yaapoeoii iiucnom B A a H H O i p a 6 o~e H3YYeHO TepMHYeCKOe IIOBeAeHHe COIIOJlHMepOB IlOJly3@HpOB MaJIeHHOBOfi KHCJIOTbI, IIOJly4eHHbIX 3TepH@HKWHefi COIIOJlHMepOB MaJIeHHOBOrO aHrHApHAa, M COIIOJIHMepOB IIOJIy3@HpOB MaJEHHOBOfi H @yMapOBOa KHCJIOT. M3 3TOr0 CgeJIaHbl 3aKJIIOYeHHR 0 CTpyKTJ'pe COIIOJIHMepOB. OIIHCaHbI TPYAHOCTH 3KCIIepHMeHTaJIbHOrOnposeAeHm peaKuHx q m n m a q m B pacTaope, KoTophre n p m e m K npespaLqeHmo B mepnofi @a3e. Thermal properties and structure of copolymers of maleic or fumaric semiestersThe thermal properties of maleic semiester copolymers, obtained by esterification of maleic anhydride copolymers, and of maleic and fumaric semiester copolymers has been investigated. Conclusions to the structure of the copolymers are drawn. The experimental difficulties involved in the cyclization reactions in solution resulting in conversion in the solid phase are described.
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