PMID- 22017334
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20120306
LR  - 20111123
IS  - 1944-8252 (Electronic)
IS  - 1944-8244 (Linking)
VI  - 3
IP  - 11
DP  - 2011 Nov
TI  - Hydrophobic but hygroscopic polymer films--identifying interfacial species and 
      understanding water ingress behavior.
PG  - 4236-41
LID - 10.1021/am200894h [doi]
AB  - The hydrophobic but hygroscopic nature of polydimethylsiloxane (PDMS) with 
      quaternary ammonium cationic side chains adsorbed on a SiO(2) surface was 
      investigated with sum frequency generation vibration spectroscopy (SFG) and 
      attenuated total reflectance infrared spectroscopy (ATR-IR). PDMS with cationic 
      side chains, named cationic polymer lubricant (CPL), forms a self-healing 
      boundary lubrication film on SiO(2). It is interesting that CPL films are 
      externally hydrophobic but internally hydrophilic. The comparison of SFG and 
      ATR-IR data revealed that the methyl groups of the PDMS backbone are exposed at 
      the film/air interface and the cationic side groups and counterions are embedded 
      within the film. The hydrophobicity must originate from the surface CH(3) groups, 
      while the ionic groups inside the film must be responsible for water uptake. The 
      surface hydrophobicity can alleviate the capillary adhesion while the hygroscopic 
      property enhances the mobility and self-healing capability of the CPL boundary 
      lubrication film.
FAU - Hsiao, Erik
AU  - Hsiao E
AD  - Department of Chemical Engineering and Materials Research Institute, The 
      Pennsylvania State University, University Park, Pennsylvania 16802, USA.
FAU - Barnette, Anna L
AU  - Barnette AL
FAU - Bradley, Laura C
AU  - Bradley LC
FAU - Kim, Seong H
AU  - Kim SH
LA  - eng
PT  - Journal Article
PT  - Research Support, U.S. Gov't, Non-P.H.S.
DEP - 20111107
PL  - United States
TA  - ACS Appl Mater Interfaces
JT  - ACS applied materials & interfaces
JID - 101504991
EDAT- 2011/10/25 06:00
MHDA- 2011/10/25 06:01
CRDT- 2011/10/25 06:00
PHST- 2011/10/25 06:00 [entrez]
PHST- 2011/10/25 06:00 [pubmed]
PHST- 2011/10/25 06:01 [medline]
AID - 10.1021/am200894h [doi]
PST - ppublish
SO  - ACS Appl Mater Interfaces. 2011 Nov;3(11):4236-41. doi: 10.1021/am200894h. Epub 
      2011 Nov 7.