Citation: Wen-chen Yan, Dong-jie Liu, Ming-wang Pan. Preparation of Poly(vinylidene fluoride)/Poly(4-vinyl pyridine) Janus Particles[J]. Acta Polymerica Sinica, ;2018, 49(3): 366-373. doi: 10.11777/j.issn1000-3304.2017.17091 shu

Preparation of Poly(vinylidene fluoride)/Poly(4-vinyl pyridine) Janus Particles

1.
Institute of Polymer Science and Engineering, Hebei University of Technology, Tianjin 300130
2.
Neptune Offshore Engineering Development Co., Ltd., Tianjin 300384

Corresponding author: Ming-wang Pan, mwpan@126.com
Received Date: 17 April 2017
Revised Date: 28 April 2017

Snowman-like Janus particles of PVDF/P4VP were prepared via a soap-free seeded emulsion polymerization using poly(vinylidene fluoride) (PVDF) latex particles as seeds and 4-vinyl pyridine (4VP) as functional monomer. All seeded emulsion polymerization was carried out in a four-necked round-bottom flask of 100 mL capacity. First, dialyzed PVDF latex (4.0 g) with a solid content of 12.5 wt% was dispersed in deionized water (40.0 g), and the dispersion was further ultrasonicated for 40 min to avoid any particle agglomeration. The flask was placed in a water bath preset at 30 ℃ and nitrogen-purged for 15 min to remove O₂ before additions of ammonia solution (1.0 g) and 4VP (0.5 g). Nitrogen-purge was maintained during the entire reaction process. The mixture was stirred at 250 r/min for 1 h to allow the monomers to swell the PVDF seed particles, followed by heating to 60 ℃. Subsequently, 1.5 mg of K₂S₂O₈ were added to trigger the polymerization, and the reaction lasted for 4 h. The average particle diameter and particle size distribution (PDI) of the composite particles were determined by dynamic light scattering. The micromorphology of the composite particles was characterized by scanning electron microscopy. The chemical composition of the composite particles was confirmed by Fourier transform infrared spectroscopy. The confined crystallization of PVDF in the composite particles was studied by differential scanning calorimetry. In this study, the introduction of an appropriate amount of ammonia solution into the polymerization system played a vital role in maitaining the stability of the reaction system and the uniformity of the composite particles, possibly due to the prevention of P4VP nucleation in the aqueous phase. One side of the compsite particles obtained was PVDF and the other side was P4VP with pyridine groups, which could be used for further modification and assembly.
- Anisotropic nanoparticles,
- Soap-free seeded emulsion polymerization,
- Ammonia solution,
- Surface nucleation,
- Poly(vinylidene fluoride)
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1.
沈阳化工大学材料科学与工程学院沈阳 110142