Zinc methacrylate has been polymerized in the solid state by the post-irradiation technique a t 89.5OC. The polymer produced was less isotactic than that obtained from barium methacrylate dihydrate when polymerized under similar conditions. The tacticity of the poly(zinc methacrylate) differed markedly from the polymer produced in the liquid phase from methyl methacrylate or methacrylic acid. X-ray studies of the zinc methacrylate showed the monomer to have an orthorhombic unit cell with lattice constants of a = 17.94A, b = 9.16 A, and c = 13.2 A. There are 8 molecules per unit cell and the symmetry can be classified as either Pnam or Pna2. The anhydrous monomer shows pronounced thermal polymerization at 89.5OC and the radiation-induced reaction shows no measurable intensity dependency over a 6 fold change in dose rate.
ZUSAMMENFASSUNG:Zinkmethacrylat wird im festen Zustand durch Nachstrahlungstechnik bei 89,5OC polymerisiert. Das erhaltene Polyrnere ist weniger isotaktisch als das unter den gleichen Bedingungen polymerisierte Bariumrnethacrylatdihydrat. Die Taktizitat des Polyzinkmethacrylats ist von dem in fliissigem Zustand hergestellten Polyrnethacrylat oder von der Polymethacrylsaure bedeutend verschieden. Rontgenometrische Untersuchungen bestatigen, daB das monomere Zinkmethacrylat aus einer orthorhombischen Elementarzelle mit den Gitterkonstanten a = 17,94 A, b = 9,16 A, c= 13,2 A besteht. Die Zahl der Molekiile in der
The phase diagram of the acrylic acid–acrylamide system as determined by DTA and the supporting x‐ray diffraction data are presented. This diagram shows that the system forms a 1 : 1 addition compound which decomposes above 0°C. There is also one eutectic point at a 67 mole‐% acrylic acid composition.
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