Initial density fluctuations effects on the microphase separation in ramified polymer mixture

Our study focuses on the initial density fluctuations effects on microphase separation in ramified polymer mixture. For this purpose, we introduce a screening length κ   by considering the condition that the scattered intensity should not be changed by cross-linking. We recover that κ2∼C/(χ−χi)κ2∼C/(χ−χi), where C is the rigidity constant of the network and χ the Flory parameter. Three regimes versus the temperature of the mixture are discussed. The kinetics of the microphase separation is also studied through the relaxation rate. The derived relaxation rate evolution relative to ramified polymers mixture must be compared to that relative to a linear polymer mixture. Finally, we discuss the solvent effect on the microphase separation and we show that the initial fluctuations have little importance because of the excluded volume interaction.