Preparation of monodispersed PNIPAm/silica composites and characterization of their thermal behaviors

다국어 초록 (Multilingual Abstract)

Two types of thermosensitive poly(N-isopropylacrylamide) (PNIPAm)-silica organic/inorganic hybrid particles were successfully prepared in aqueous solution through a facile synthetic process. Silane coupler of vinyl organic groups connects the PNIPAm to silica. First, hybrid spheres were prepared by grafting PNIPAm polymers to VTMS (vinyl trimethoxysilane) silica spheres. The thickness of polymer shell on the silica surfaces could be easily controlled by varying the concentrations of NIPAm monomer.
Second, another type of hybrid particle was fabricated by encapsulating PNIPAm polymer with silica materials. The PNIPAm polymers were completely encapsulated by silica shell. The morphologies and shell thickness were characterized through SEM and TEM. The variations of phase transition temperature of PNIPAm were measured using DSC.

참고문헌 (Reference)

1 Y. D. Zhang, 47 : 2984-, 2006

2 B. Strachotova, 48 : 1471-, 2007

3 K. Kubota, 94 : 5154-, 1990

4 Y. G. Lee, 23 : 10875-, 2007

5 F. Caruso, 13 : 109-, 2001

6 M. S. Fleming, 13 : 2210-, 2001

7 J. Zhu, 13 : 3774-, 2001

8 J. Zhou, 44 : 3202-, 2006

9 L. Qi, 23 : 11996-, 2007

10 Y. Q. Hu, 56 : 289-, 2001

11 H. E. Bergna, 131-, 2006

12 W. Sto¨ ber, 26 : 62-, 1968

13 H. Ge, 110 : 20635-, 2006

14 Y. Fang, 7 : 804-, 2004

15 Y. Li, 39 : 81-, 2006

16 I. Lynch, 108 : 10893-, 2004

17 K. Zhang, 288 : 380-, 2003

18 I. Tissot, 34 : 5737-, 2001

19 S. Reculusa, 14 : 2354-, 2002

20 A. Derro, 284 : 78-, 2006

21 S. Barthlet, 4 : 1677-, 2004

22 C. Barthlet, 11 : 408-, 1999

23 R. K. Iler, "The Chemistry of Silica" Wiley 1979

24 C. J. Brinker, "Sol–Gel Science" Academic Press 1990

25 B. Smith, "Infrared Spectral Interpretation: A Systematic Approach" CRC Press 1999