| Summary: | 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.
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