A vibrational spectroscopic study of molecular restructuring at surfaces of unidirectionally rubbed polyimide thin films

Journal of Physical Chemistry B

Volumn 102, Issue 51, 1998, Pages 10556-10567

  Hietpas, Geoffrey D ^a,b   Sands, James M ^a,c   Allara, David L ^a  

^a PENNSYLVANIA STATE UNIVERSITY   (United States)

^b DUPONT COMPANY   (United States)

^c U S ARMY RESEARCH LABORATORY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0001489901     PISSN: 15206106     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp983363i     Document Type: Article

References (42)

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32. The deviation in this behavior for the 4.7 nm film is due to the fact that, for films 2-5 nm, the films are highly dependent on preparation condition and usually contain a larger fraction of perturbed imide rings than films slightly thicker, near 7-10 nm. This behavior can also be shown in Figure 6.
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35. Specifically, the observation of a sharp (004) peak when the scattering vector (Q) is parallel to the rubbing direction shows the chains remain in an extended zigzag conformation with a 3.1 nm repeat unit spacing along the chain axis. However, when Q is perpendicular to the chain axis, the associated peak shows a large increased intensity and broadening, indicating a decay of the interchain ordering away from the periodic value of ∼0.6 nm.
36. An important point that appears to have been missed in previous X-ray characterization studies is that the actual magnitude of the buffing response increases directly with an increase in the initial state of ordering of the BPDA-PDA film (Section 3.3). Thus, buffing-induced structural changes must be correlated with the initial state of the selected sample in order to obtain statistically meaningful results.
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40. bulk.
41. In the study in ref 27, a room-temperature-buffed polystyrene sample heated to 40 °C atually showed an increase in chain orientation. Russell and co-workers ascribe this to a relaxation of stresses and bond angle distortions arising within the film during rubbing.
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