Thermoresponsive structural change of a poly(N-isopropylacrylamide) graft layer measured with an atomic force microscope

Langmuir

Volumn 17, Issue 8, 2001, Pages 2402-2407

  Kidoaki, Satoru ^a,b,c   Ohya, Shoji ^a   Nakayama, Yasuhide ^a   Matsuda, Takehisa ^d  

^a NATIONAL CEREBRAL AND CARDIOVASCULAR CENTER   (Japan)

^b KYOTO UNIVERSITY   (Japan)

^c JAPAN SCIENCE AND TECHNOLOGY AGENCY   (Japan)

^d KYUSHU UNIVERSITY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

PHOTOGRAFTING;

ATOMIC FORCE MICROSCOPY; GRAFTING (CHEMICAL); MOLECULAR STRUCTURE; POLYMERIZATION; SCANNING; SOLUTIONS;

POLYAMIDES;

EID: 0035901797     PISSN: 07437463     EISSN: None     Source Type: Journal    
DOI: 10.1021/la001522v     Document Type: Article

References (17)

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17. The DC-glass substrates prepared in the usual method described in the Experimental Section inevitably produced the graft-polymerized layer with some scars, wheel tracklike defects. In the tracklike region, the graft layer was markedly lost. The defect is considered to be produced by the detachment of a dithiocarbamate group, which is induced by scratching and shaving of the outermost surface of the substrate through the collision among the glass substrates in the stirring process of the substrates in the preparation solution. The measurement in Table 2 has been carried out for the sample with such a defect. The Usual procedure to simultaneously prepare many DC-glasses (∼100 pieces) is suitable in this case because so many DC-glass samples are needed in order to check reproducibility of the measurement of graft thickness. On the other hand, to show a clear image of the graft layer without a defect, the DC-glass substrate was prepared under special care to avoid such collision of substrate, and the graft-polymerization in Figure 2 was performed on the newly prepared DC-glass. Since only a few pieces of DC-glass can be prepared in an experimental run by the latter procedure, it was rather difficult to prepare enough DC-glasses of the same lot to systematically check the reproducibility of the thickness of the graft layer. Thus, the data in Tabale 2 were taken through the former procedure, and the clear image in Figure 2 was observed through the latter procedure. The difference of the graft thickness of the PNIPAAm layer ([NIPAAm] = 5 M) between the results obtained in Figure 2 and those obtained in Table 2 is due to such difference of experimental condition.