What are the structural differences between the water-based acrylic emulsion composed of a mixture of hard TG and soft TG, and the emulsion with equal TG obtained through direct polymerization?
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What are the structural differences between the water-based acrylic emulsions obtained by mixing rigid TG and soft TG substances, and those with an equal TG value that are produced through direct polymerization?
Generally, emulsions with a high Tg have larger particle sizes, while those with a low Tg have smaller particle sizes. When these two types of emulsions are mixed, a bimodal emulsion is formed. Compared to emulsions obtained through direct polymerization at the same Tg, bimodal emulsions result in a wider range of particle sizes for the latex particles as well as a wider range of molecular weights. Bimodal emulsions can take advantage of the strengths of both types of individual latexes. But the prerequisite is that these two emulsions have good compatibility. In other words, they have high stability; these two types of emulsions require high chemical and mechanical stability.