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Polymer Congress 2018
Polymer Sciences
ISSN: 2471-9935
Page 84
June 04-05, 2018
London, UK
4
th
Edition of International Conference on
Polymer Science and
Technology
Polym Sci 2018, Volume 4
DOI: 10.4172/2471-9935-C2-012
P
erfluorocarbon (RF) groups attached as pendent groups to
aqueous polymers (polyacrylamide and similar polymers)
via spacer groups of various lengths have shown extraordinary
hydrophobicity compared with hydrocarbon groups of similar
lengths as shown by NMR, and rheology studies. Large RF
mediated increases in polymer association especially for
longer spacer groups were observed for a wide range of
these polymers. In addition, blends of well-defined C
4
F
9
, C
7
F
15
,
C
10
F
21
and C
13
F
27
end-functionalized polystyrene (RF-PS) and
poly(n-butylmethacrylate) prepared by ATRP using RF–tagged
initiators. Blends of these polymers have been studied by DSC,
AFM, TEM and optical transmittance. The AFM micrographs
show crater, necklace and other RF mediated morphologies
indicating he presence of submicron RF micelles that mediate
blending. More recently RF-PS polystyrenes end-functionalized
with longer perfluoroalkyl (RF=C
7
F
15
, C
10
F
21
, C
13
F
27
) groups were
studied using DSC, nano-indentation and other properties
These showed pronounced increases in storage and especially
loss moduli compared with polystyrene polymers having the
same molecular weights hence indicating an important role
especially of the C
13
F
27
groups in both increasing both storage
and mechanical loss moduli. The RF groups appear to be
present as micelles. Interestingly, compared with the matching
PS, the glass transition temperatures of the C
13
F
27
-PS polymers
were found to decrease by as much as 15°C being seen for
longer RF groups consistent with rapid dynamics in the C
13
F
27
micelles below 100°C.
hogenesc@usc.eduCurious associative/dynamic properties of perfluorocarbonmodified
vinyl polymers in solutions, blends and in the solid state
Thieo Hogen Esch
University of Southern California, USA