[논문]Low Temperature Suspension Polymerization of Methyl Methacrylate for the Preparation of High Molecular Weight Poly(methyl methacrylate)/Silver Nanocomposite Microspheres

Yeum, Jeong-Hyun; Ghim, Han-Do; Deng, Yulin

doi:10.1007/bf02875662

Low Temperature Suspension Polymerization of Methyl Methacrylate for the Preparation of High Molecular Weight Poly(methyl methacrylate)/Silver Nanocomposite Microspheres 원문보기

Fibers and polymers, v.6 no.4, 2005년, pp.277 - 283

Yeum, Jeong-Hyun (Department of Natural Fiber Science, Kyungpook National University) , Ghim, Han-Do (Department of Textile System Engineering, Kyungpook National University) , Deng, Yulin (School of Chemical and Biomolecular Engineering, Georgia Institute of Technology)

Abstract ▼ AI-Helper

In order to prepare high molecular weight poly(methyl methacrylate) (PMMA)/silver nanocomposite microspheres, methyl methacrylate was suspension-polymerized in the presence of silver nanoparticles at low temperature with 2,2'-azobis(2,4-dimethylvaleronitrile) as an initiator. The rate of conversion was increased by increasing the initiator concentration. When silver nanoparticles were added, the rate of polymerization decreased slightly. High monomer conversion (about $85\%$) was obtained in spite of low polymerization temperature of $30^{\circ}C$. Under controlled conditions, PMMA/silver microspheres with various number-average degrees of polymerization (6,000-37,000) were prepared. Morphology studies revealed that except for normal suspension microspheres with a smooth surface, a golf ball-like appearance of the microspheres was observed, due to the migration and aggregation of the hydrophilic silver nanoparticles at the sublayer beneath the microsphere's surface.

주제어

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문제 정의

In the current study, a room-temperature freee-radical initiator, 2, 2, -azobis(2, 4-dimethylvaleronitrile) (ADMVN), which can lower the polymerization temperature to room temperature was selected for suspension polymerization of MMA with or without silver nanoparticles. The purpose of this article is to investigate the effects of silver nanoparticles on the polymerization behaviors md morphology ofHMWPMMA.

제안 방법

Although the formation mechanism of these golf ball microspheres is not yet clear, we believe this phenomenon is related to the aggregation of silver nanoparticles during polymerization. It is noteworthy that the silver nanoparticles used in this study are in an aqueous suspension form, and tiiat no surfece modification was applied. Therefore, the silver nanoparticle surface is relatively hydrophilic and may form aggregates in the oil phase.
To prepare HMW PMMA/silver nanocomposite microspheres, suspension polymerization of MMA in the presence of aqueous silver nanoparticles dispersion was conducted. The suspending agent was dissolved in water under a nitrogen atmosphere with constant stirring in a 250 m/reactor fitted with a condenser.

대상 데이터

), was recrystallized twice in methanol before use. Poly(vinyl alcohol) (PVA) with number-average molecular weight of 127, 000 and degree of saponification of 88 % (Aldrich Co.) was used as a suspending agent. Aqueous silver nanoparticles dispersion (AGS-WP001, 10, 000 ppm) with diameters ca.

후속연구

The detailed mechanism, such as why only part of the microsphere (about 1/2) is golf ball-shaped, is still not clear. Further investigations in this area definitely are needed. Figure 6(c) shows the fracture surface of PMMA/silver microspheres.
Second, the silver particles may function as scavengers for the initiator. Further research is needed to fully understand the real mechanisms. In con이iision, the suspension polymerization of MMA in the presence of silver nanoparticles using ADMVN is an efiective method to increase both yield and molecular weight of PMMA/silver microspheres at the same time.
microspheres prepared in this study. Future work is needed to understand the formation mechanism of golf ballshape particle formation.

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