The effect of acetaldehyde in the polymerization process of vinyl chloride
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Under alkaline conditions, vinyl chloride produces acetaldehyde, which in turn affects the polymerization reaction. What specific effects does this have? What is the principle of influence?
Acetaldehyde, along with other impurities, are relatively active chain transfer agents that can cause the growing polyvinyl chloride chains to undergo transfer during the polymerization process. This leads to a reduction in the polymerization rate and degree of polymerization, affects the thermal decomposition temperature of the product, and decreases its viscosity. It also tends to cause branching and cross-linking of polymer molecules, thereby deteriorating the properties of the product.
Will the particle size also be affected in this process?