Studies on the Mechanism and the Morphology of the Plastic Pigment by Two Stage Emulsion Polymerization

• Main Authors: Wu,Ming-hung, 吳銘洪
• Other Authors: Lee,Huang-Kuei
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/68703930864065245802

碩士 === 文化大學 === 造紙印刷研究所 === 84 === Plastic pigment are used in coated paper and paperboaLrd to improve the properties of bright, gloss, smoothness and printability. The fundamentals of the technology is to emphasize on emulsion polymerization. The characteristics of polymeric pigment depend on such as the existence of the surfactant, the amount of the initiator, polymer comosition, crosslinking agent and the condition of polymerization. In this study, the latex was synthesized by the method of seeded emulsion polymerization. The nucleation mechanism during the first stage was probed and by changing the parameters of polymerization some results are obtained. When both of the hydrophobic and hydrophilic monomers exist in the polymerization system, with the increase of hydrophilic monomer ratio, the rate of the the reaction will speed up. But excessive hydrophilic monomer will make the particle a little indistinct. Increasing the concentration of the initiator will raise the reaction rate. In contrast, the particle size will decrease. As soon as the crosslinking agent enter the system, the reaction rate will also get speedily and the particle will take shape in the form of interpenetration polymer networks. Glass transition temperature of the reaction products will be advanced and the IPNs will assist on the morphology transposition of the second polymerization process. During the second polymerization stage of the linear seed particle, by using the crosslinking agent made the particle became IPNs constitution. Then after ketone softened, alkali swelled and acid reduced series processes, particles will form single or multiple void morphology. If first stage's IPNs seeds are softened by alkane, then go on adding some prepolymer could also acquire the anomalous particles. All above results are testified by using TEM and SEM.