The thermal degradation of polyvinyl compounds. I. A new type of molecular still

Abstract

A survey of depolymerization reactions has been made and the importance of the degradation emphasized in addition polymerization especially at high temperatures. In order to follow the course of the thermal degradation it is necessary to remove rapidly and measure the amount of monomer produced. In addition it is essential to measure the average size and the number of macromolecules during the course of the reaction. A molecular still for carrying out the degradation is described in which it is possible to follow the evolution of monomer continuously. The conditions necessary for the proper utilization of this type of still are described.

Dodecyl methacrylate and vinyl acetate copolymers as viscosity modifier and pour point depressant for lubricating oil

“…It may be due to fact that VA molecules add to the growing chain of the polymer through its -CH 2 -group and such type of addition involves less steric effect [22]. Polymers formed in this process always have a higher molecular weight and become thermally more stable [23]. In case of P-1, decomposition started at 150°C with 12.5% weight loss and 75% weight was lost at 400°C.…”

Infrared Spectroscopic Studies on Some Thermally Degraded Poly(methyl methacrylate) Doped with N,N,N´,N´- tetraoxaloyl Para Sulphanilamide

“…For PMMA prepared by free radical polymerization, the depolymerization is initiated at relatively low temperature (26)(27)(28)(29)(30) by the cleavage of weak double bonds at the chain end; PMMA is regarded as a polymer that depropagates to monomer as a result of thermal degradations up to 550 o C (31)(32)(33)(34)(35) . It has also been reported ) [36][37][38][39][40][41][42]( that some degradations occur by side-group elimination, leading to the production of unsaturated products.…”