Monodisperse polymer particles were prepared via conventional microsuspension polymerization or one-step seeded polymerization, using 1,6-hexanedioldiacrylate or its mixture with ethylene glycol dimethacrylate (EGDMA) as crosslinking monomer and poly(methyl methacrylate) synthesized by soap-free polymerization as seed particles. For the study, the effects of the ratio of the absorbed monomer or monomer mixture to the seed polymer particles (swelling ratio), the ratio of EGDMA in absorbed monomer mixture, the dosage of initiator, polymer particle structure, and the electroless Ni plating on the mechanical properties of polymer particles, such as recovery rate, K-values, breaking strength, and breaking displacement were investigated using micro compression test. It was observed that monomer swelling ratio influenced only on breaking strength, whereas EGDMA ratio in monomer mixture, dosage of initiator, polymer structure and electroless Ni plating did on both K-values and breaking strength.
The effects of the swelling ratio (S/R), the existence of methyl side groups, the length and molecular structure of backbone chain of crosslinking monomer on the variation of mechanical properties of single polymer particle were investigated. For the study, monodisperse polymer particles were prepared via one-step seeded polymerization using PMMA as seed particles and 1,n-alkanediol di(meth)acrylate or (ethylene glycol) n di(meth)acrylate as crosslinking monomer. Recovery rate, K-values, breaking strength, and breaking displacement were measured as mechanical properties and they were performed by using microcompression test. The following observations were made: (1) only breaking strength was closely related to the swelling ratio; (2) the existence of methyl side groups increased the K-values but decreased the recovery rate of the polymer particles; and (3) K-values were the most sensitive to the variation of backbone chain length of crosslinking monomer, and they were decreased with the increase of the backbone chain length of crosslinking monomer.
Monodisperse polymer particles were prepared via one-step seeded polymerization using polystyrene, poly(methyl methacrylate), or styrene/methyl methacrylate copolymer [poly(ST-co-MMA)] as seed particles and 1,6-hexanedioldiacrylate or divinylbenzene as crosslinking monomer. For the study, the effects of the combination of seed polymer and crosslinking monomer, the ratio of the absorbed monomer to the seed polymer particles (swelling ratio: S/R), and the seeded polymerization rate on the variation of surface morphology and mechanical properties of polymer particles, such as recovery rate, K-values, breaking strength, and breaking displacement were investigated by using microcompression test. It was observed that the surface morphology could be controlled by changing polymerization rate or combination of seed polymer and crosslinking monomer, and it had a great influence on mechanical properties, especially the breaking strength.
Monodisperse polymer particles composed of polystyrene (PS) and poly(1,6-hexanedioldiacrylate) were prepared via one-step seeded polymerization using PS as seed particles. For the study, the effects of the molecular weight of seed polymer particles, the ratio of the absorbed hexanediol dimethacrylate (HDDA) to the seed polymer particles (swelling ratio), and the seeded polymerization rate on the surface morphology of poly(St-HDDA) particles were investigated. It was observed that the crater-shaped defect was at the surface of poly(St-HDDA) particles, independent of the molecular weight of seed polymer, and swelling ratio. But its surface morphology could be controlled by changing the rate of the seeded polymerization.
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