PMID- 14757092
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20040520
LR  - 20190917
IS  - 0021-9797 (Print)
IS  - 0021-9797 (Linking)
VI  - 271
IP  - 1
DP  - 2004 Mar 1
TI  - Surface characterization of poly(4-vinylpyridine) quaternized with tetradecyl 
      bromide: effect of the degree of quaternization.
PG  - 181-6
AB  - The surface behavior of poly(4-vinylpyridine) quaternized with tetradecyl bromide 
      (P4VPC(14)) as function of the quaternization degree was studied. The percentage 
      of vinylpyridine moieties quaternized was found to be 35 to 75%. Surface 
      pressure-area isotherms (pi-A) at the air-water interface were determined. The 
      polymer monolayers show particular shapes at different quaternization degrees. In 
      order to get information about the hydrophobicity degree of the polymeric 
      systems, the surface energy (SE), and their dispersion and polar contributions, 
      gamma(D) and gamma(P) respectively, measurements of the contact angle (CA) with 
      water, bromobenzene, and cis-decalin were performed. The results obtained are 
      dependent on the quaternization percentage of the functionalized polymers. At 
      high quaternization degree, hysteresis in the pi-A diagrams was observed. The 
      change in the P4VPC(14) molecular organization in the monolayer was also 
      investigated during the compression and expansion processes. During these 
      processes the monolayer was monitored by Brewster angle microscopy (BAM). For 
      several cycles, all compression curves and all expansion curves showed a common 
      intersection point. We have tried to describe the P4VPC(14) molecular 
      organization at the air-water interface by molecular dynamic simulation (MDS). 
      The results are also discussed in terms of the effect of the counterions and 
      water on the stability of the system over the more packed region.
FAU - Gargallo, Ligia
AU  - Gargallo L
AD  - Depto. Quimica Fisica, Facultad de Quimica (502), Pontificia Universidad Catolica 
      de Chile, Casilla 306, Santiago 22, Chile. lgargall@puc.cl
FAU - Miranda, Beatriz
AU  - Miranda B
FAU - Leiva, Angel
AU  - Leiva A
FAU - Rios, Hernan
AU  - Rios H
FAU - Gonzalez-Nilo, Fernando
AU  - Gonzalez-Nilo F
FAU - Radic, Deodato
AU  - Radic D
LA  - eng
PT  - Journal Article
PL  - United States
TA  - J Colloid Interface Sci
JT  - Journal of colloid and interface science
JID - 0043125
EDAT- 2004/02/06 05:00
MHDA- 2004/02/06 05:01
CRDT- 2004/02/06 05:00
PHST- 2004/02/06 05:00 [pubmed]
PHST- 2004/02/06 05:01 [medline]
PHST- 2004/02/06 05:00 [entrez]
AID - S0021979703006751 [pii]
AID - 10.1016/s0021-9797(03)00675-1 [doi]
PST - ppublish
SO  - J Colloid Interface Sci. 2004 Mar 1;271(1):181-6. doi: 
      10.1016/s0021-9797(03)00675-1.