Dodecyl Methacrylate Research Articles

Solid‐state polymerization of long‐chain vinyl compounds. IV. Effects of chain length on the polymorphic behavior and postpolymerization of n‐alkyl methacrylates

AbstractPolymorphic behavior and γ‐ray‐initiated postpolymerization of the even‐numbered long‐chain Methacrylates (C18‐C12) have been investigated. Phase transition behaviors of octadecyl, hexadecyl, tetradecyl, and dodecyl methacrylates are magnified image respectively, which become simpler with shortening of the chain length. The methacrylate monomers with sufficiently long hydrocarbon chains, such as octadecyl and hexadecyl, can be polymerized rapidly in the α‐form crystal (hexagonal packing) by a fully two‐dimensional mechanism, whereas in the β‐form crystal (triclinic packing), polymerization can hardly occur. In the case of dodecyl methacrylate, however, an accelerated polymerization in the β form occurs after an induction period of several hours and the resultant polymer is gel‐like. This can be interpreted by the propagation reaction across the polymer chain already formed. It has been found that the solid‐state post‐polymerization of n‐alkyl methacrylates is affected by the chain length through the packing mode of the monomer molecules and also by the aggregation state of side chains in the resultant comblike polymer.

The termination reaction in free radical copolymerization. I. Methyl methacrylate and butyl‐ or dodecyl methacrylate

AbstractUsing a spatially intermittent reactor, the absolute rate constant for the termination reaction in free radical copolymerization has been measured for the monomer pair methyl methacrylate (MMA)–butyl methacrylate (BMA). For the pair MMA–dodecyl methacrylate (DMA) the relative rate constant for termination has been measured. In both cases the termination rate constant was a monotonically changing function of the monomer feed composition. This function can be well approximated by a simple calculation of the enchained monomer units' contributions to the average segmental friction coefficient of the copolymer chain. An attempt to apply a previously derived theoretical treatment based on penultimate unit effects produced physically unrealistic results.

Copolymerization of methyl methacrylate and dodecyl methacrylate

Copolymerization of methyl methacrylate and dodecyl methacrylate

Free radical polymerization kinetics of n‐lauryl methacrylate

AbstractThe kinetics of free radical polymerization of n‐lauryl methacrylate (dodecyl methacrylate) were studied at 60 and 80°C in bulk and in benzene solution. The analysis of the data showed the kinetic results deviated from classical behaviour and that this deviation could be explained by the chain length dependence of the diffusion controlled termination rate constant, Kt. Primary radical termination is explicitly considered and rejected as being insignificant in this work. Because of its lessened flexibility poly(n‐lauryl methacrylate) shows a greater chain length dependence for Kt than does poly(methylmethacrylate).