Preparation and Characterization of PS-b-P2VP/Fe3O4 Nanocomposites†

doi:10.7503/cjcu20131296

Abstract

Abstract:

Oleic acid modified Fe₃O₄ nanoparticles(OA-Fe₃O₄) with uniform particle size were blended with polystyrene-b-poly(2-vinyl pyridine)(PS-b-P2VP) that had micro-phase separation structure using solution-mixing method. The resultant PS-b-P2VP/Fe₃O₄ nanocomposites were superparamagnetic. The results showed that OA-Fe₃O₄ nanoparticles were dispersed in the PS phase of PS-b-P2VP, when the mass fraction of OA-Fe₃O₄ was 1%, 3%, 5% and 10%. However, when the content of OA-Fe₃O₄ was 8%, the dispersion of OA-Fe₃O₄ particles in the PS-b-P2VP matrix changed dramatically. In this case, the nanoparticles formed large aggregates, which were dispersed across PS-b-P2VP matrix. Meanwhile the rheological properties of PS-b-P2VP/Fe₃O₄ nanocomposites also changed.

Key words: Fe3O4 magnetic nanoparticles, PS-b-P2VP block copolymer, Nanocomposite, Dispersion state

CLC Number:

O631

TrendMD:

ZHANG Zhijie, GONG Jiang, TAN Haiying, YAO Kun, TANG Tao. Preparation and Characterization of PS-b-P2VP/Fe₃O₄ Nanocomposites^†[J]. Chem. J. Chinese Universities, 2014, 35(5): 1080.

Figures/Tables 8

Fig.1 TEM images of PS-b-P2VP nanocomposites with different mass fraction of OA-Fe3O4^ Mass fraction of OA-Fe3O4: (A) 0; (B) 1%; (C) 3%; (D) 5%; (E) 8%; (F) 10%.

Fig.2 High-resolution TEM images of PS-b-P2VP nanocomposites with 8%(A, B) and 10%(C, D) OA-Fe3O4

Fig.3 DSC curves of pure PS-b-P2VP(BCPs) and PS-b-P2VP/OA-Fe3O4 nanopcomposities(PNCs)^a. Pure BCPs; b. 1%NPs; c. 3%NPs; d. 5%NPs; e. 8%NPs; f. 10%NPs.

Fig.4 Thermogravimetric analysis of pure BCPs and PNCs in N2(A) and air(B)

Table 1 TGA data under nitrogen condition for pure BCPs and PNCs

Sample	T_ini/℃	T_max/℃	Residue at 550 ℃ (%, mass fraction)
Pure BCPs	340.8	408.6	0.5
1%NPs	340.3	409.8	1.1
3%NPs	341.5	410.1	3.9
5%NPs	342.4	411.3	6.3
8%NPs	342.9	412.5	8.5
10%NPs	347.8	416.6	12.4

Table 2 TGA data under air condition for pure BCPs and PNCs

Sample	T_ini/℃	T_max/℃	Residue at 550 ℃ (%, mass fraction)
Pure BCPs	335.3	391.6	0.6
1%NPs	335.7	392.2	1.7
3%NPs	336.1	393.2	5.0
5%NPs	336.6	393.8	6.8
8%NPs	338.1	395.1	9.8
10%NPs	341.3	398.6	13.2

Fig.5 Complex viscosity(η*)(A), storage modulus(G')(B) and loss modulus(G″)(C) as a function of frequency for pure BCPs and PNCs

Fig.6 Room temperature hysteresis loop of the PNCs with different particle loadings

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Preparation and Characterization of PS-b-P2VP/Fe₃O₄ Nanocomposites^†

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