Lubricating effect of thin films of styrene-dimethylsiloxane block copolymers
(1999) In Langmuir 15(11). p.3859-3865- Abstract
- The lubricating effect of styrene-dimethylsiloxane block copolymer films spin cast on Si wafers was found to increase with increasing size of the poly(dimethylsiloxane) (PDMS) block. Friction properties of symmetrical and close-to-symmetrical block copolymers were evaluated in contact with bromobutyl rubber in a plate-on-plate configuration. X-ray photoelectron spectroscopy showed that the copolymer films were all covered by an at least a 10 nm thick layer of PDMS. The lubricating effect remained constant down to a film thickness comparable to the chain dimensions of the copolymer, R-0, after which it decreased progressively. At thicknesses below R-0, the copolymer dewetted the wafer and formed discrete domains with sizes comparable to... (More)
- The lubricating effect of styrene-dimethylsiloxane block copolymer films spin cast on Si wafers was found to increase with increasing size of the poly(dimethylsiloxane) (PDMS) block. Friction properties of symmetrical and close-to-symmetrical block copolymers were evaluated in contact with bromobutyl rubber in a plate-on-plate configuration. X-ray photoelectron spectroscopy showed that the copolymer films were all covered by an at least a 10 nm thick layer of PDMS. The lubricating effect remained constant down to a film thickness comparable to the chain dimensions of the copolymer, R-0, after which it decreased progressively. At thicknesses below R-0, the copolymer dewetted the wafer and formed discrete domains with sizes comparable to R-0. The copolymer could further be blended with up to 70 wt % polystyrene without detecting a decrease in the lubricating effect. A mechanism is proposed for the observed frictional behavior where microflakes are abraded from lamellar copolymer surfaces and stick to the contacting rubber surface, whereafter lubrication may result from sliding of PDMS brushes against each other. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/149899
- author
- Ndoni, Sokol ; Jannasch, Patric LU ; Larsen, Niels B and Almdal, Kristoffer
- organization
- publishing date
- 1999
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Langmuir
- volume
- 15
- issue
- 11
- pages
- 3859 - 3865
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- scopus:0032629281
- ISSN
- 0743-7463
- DOI
- 10.1021/la980986e
- language
- English
- LU publication?
- yes
- additional info
- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Polymer and Materials Chemistry (LTH) (011001041)
- id
- 010544b8-e083-4d74-afc6-a8452d9333b4 (old id 149899)
- date added to LUP
- 2016-04-01 11:59:23
- date last changed
- 2022-01-26 21:11:45
@article{010544b8-e083-4d74-afc6-a8452d9333b4, abstract = {{The lubricating effect of styrene-dimethylsiloxane block copolymer films spin cast on Si wafers was found to increase with increasing size of the poly(dimethylsiloxane) (PDMS) block. Friction properties of symmetrical and close-to-symmetrical block copolymers were evaluated in contact with bromobutyl rubber in a plate-on-plate configuration. X-ray photoelectron spectroscopy showed that the copolymer films were all covered by an at least a 10 nm thick layer of PDMS. The lubricating effect remained constant down to a film thickness comparable to the chain dimensions of the copolymer, R-0, after which it decreased progressively. At thicknesses below R-0, the copolymer dewetted the wafer and formed discrete domains with sizes comparable to R-0. The copolymer could further be blended with up to 70 wt % polystyrene without detecting a decrease in the lubricating effect. A mechanism is proposed for the observed frictional behavior where microflakes are abraded from lamellar copolymer surfaces and stick to the contacting rubber surface, whereafter lubrication may result from sliding of PDMS brushes against each other.}}, author = {{Ndoni, Sokol and Jannasch, Patric and Larsen, Niels B and Almdal, Kristoffer}}, issn = {{0743-7463}}, language = {{eng}}, number = {{11}}, pages = {{3859--3865}}, publisher = {{The American Chemical Society (ACS)}}, series = {{Langmuir}}, title = {{Lubricating effect of thin films of styrene-dimethylsiloxane block copolymers}}, url = {{http://dx.doi.org/10.1021/la980986e}}, doi = {{10.1021/la980986e}}, volume = {{15}}, year = {{1999}}, }