Stereo complexes in solutions of syndio- and isotactic poly(methyl methacrylate) mixtures: 1. Aggregation time and character of aggregated particles in different solvents

Complexation of stereoregular poly(methyl methacrylates). 11. A mechanistic model for stereocomplexation in the bulk

“…The result is a linear dependence for the major part of the data. From the slope and the intercept on the log (ta) axis it is now possible to obtain a measure for the maximum growth rate at 1+3 = 0; / SAH1+3 \ _ 1 / 1+3 \ X K / aHi+3=o ta(AH1+3=0) In (10) \ log (ta) / (I) Maximum growth rate of complexes and crystallites, in case of 1:2 il/sl blends, as defined by eq 1 as a function of annealing temperature. (II) The total heat of decomplexation (and melting) AH1+3, measured after annealing for 1 h at a given temperature Ta as a function of annealing temperature.…”

“…(9) Chapter 12 of ref 7. (10) On Growth And Form: Fractal and Non-Fractal Patterns in Physics; Stanley, . E., Ostrowsky, N., Eds.…”

Aggregation of syndiotactic poly(methyl methacrylate) in dilute solutions

“…The decrease in specific viscosity 8 may be explained either by a purely intramolecular aggregation process (leading to a more compact conformation) or by an intermolecular aggregation process if the aggregates are more compact than the nonaggregated molecules. 43 For solution without aggregation, we write…”

Complexation of stereoregular poly(methyl methacrylates). 10. Influence of polydispersity in matrix-oligomer systems

“…The first part represents the number of ways one can distribute the oligomers over Nm matrix units without considering the distinguishability of the oligomers because of their difference in length.201* The second part of the equation takes account of this distinguishability. 13 The final expression for S2 is given by AS9 = R In ( ns(N1a,N2s,...,Nj) nm(N1Pc,N2Pc.....NJC) Qa(N,°,N2°,...,Ns°)…”

“…exp(-nAG,°/2RT) (13) where 0n is the degree of occupancy of the matrix by oligomers of length n defined by 0" = (n/2)N npc / Nm (14) mn is the basemole fraction of oligomer with chain length n free in solution, defined by mn = riNna/(Ns + ' 8) = c(x" -20"xm) (15) 1 = 1…”