𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Investigations in the field of solid-state polymerization—XXXIV [1]: Studies on the polymerization of cholesteryl methacrylate and cholesteryl vinyl ether

✍ Scribed by Gy. Hardy; K. Nyitrai; F. Cser

Publisher
Elsevier Science
Year
1976
Tongue
English
Weight
442 KB
Volume
12
Category
Article
ISSN
0014-3057

No coin nor oath required. For personal study only.

✦ Synopsis

It was demonstrated that the liquid-phase polymerization of CMA is more rapid by several orders of magnitude than that in the solid state. In monoclinic crystals of CMA, preconditions of a topochemical process can be established but polymerization has a heterogeneous character. The heterogeneous polymerization shows high activation energy and leads to the appearance of a new phase demonstrated by X-ray diffractometry. The amount of the new phase increases more rapidly than the conversion. The role of the crystalline system in the reaction is supported by the observation that the crystalline particles are used up just at the conversion limit. For CVE, topochemical conditions are not fulfilled, thus the solid-state polymerization cannot start.

📜 SIMILAR VOLUMES

Investigations in the field of radiation
Investigations in the field of radiation-induced solid state polymerization—XXI. The influence of the conditions of crystallization on the solid phase polymerization of binary eutectic systems
✍ Gy. Hardy; G. Nagy; J. Varga; J. Juhos 📂 Article 📅 1967 🏛 Elsevier Science 🌐 English ⚖ 718 KB

A study has been made of the phase diagrams of the systems (N-vinyl succinimide-endo methylene tetrahydro phthalic acid mono allyl ester), (succinimide-endo methylene tetrahydro phthalic acid mono allyl ester) and (acetanilide--endo methylene tetrahydro phthalic acid mono aUyl ester). It has been co

Investigations in the field of solid-sta
Investigations in the field of solid-state polymerizations—XXXIII: Molecular motion studies on acenaphthylene-poly-(acenaphthylene) systems
✍ F. Cser; Gy. Hardy; Z. Veksli 📂 Article 📅 1974 🏛 Elsevier Science 🌐 English ⚖ 347 KB

Spin-lattice relaxation measurements of composite systems with different monomer-to polymer ratios are consistent with the phase diagram described previously. Relaxation curve of the system with monomer content higher than ML., shows behaviour different from those for systems of higher polymer conte

Influence of molecular arrangement on th
Influence of molecular arrangement on the γ-ray-irradiation solid-state polymerization of 1-octadecyl vinyl ether with a characteristic polymorphism
✍ Atsuhiro Fujimori; Hideki Saitoh; Yoshio Shibasaki 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 251 KB 👁 1 views

The polymorphic behavior of 1-octadecyl vinyl ether was investigated by DSC and X-ray diffraction measurements under various temperatures. In DSC measurement of 1-octadecyl vinyl ether in the temperature range of Ϫ30 to approximately 50°C, four transition peaks were observed on heating, whereas thre

Investigations in the field of radiation
Investigations in the field of radiation-induced solid-state polymerization—XVI. Copolymerization in the eutectics of pairs of monomers which do not polymerize in the solid state (maleic anhydride and endomethylene-tetrahydrophthalic monopropyl ester)
✍ Gy. Hardy; N. Fedorova; K. Nyitrai 📂 Article 📅 1966 🏛 Elsevier Science 🌐 English ⚖ 239 KB

The solid state copolymerization ofmaleic anhydride and endomethylene-tetrahydrophthalic monopropyl ester was studied in the eutectic and other mixtures. It was concluded that the copolymerization of the monomers, neither of which polymerizes alone in the solid state, is made possible by the increas