Chemistry Reference
In-Depth Information
c
b
c
c
0.08
b
O
PABDA
PMAEDA
a
O
O
O
a
0.06
n
b
c
a
0.04
c
b
c
c
b
0.02
O
a
O
O
O
a
a
n
b
c
0.00
13
14
15
16
17
18
19
20
7
6
5
4
3
2
1
Elution Volume (mL)
Chemical shift (ppm)
Figure 4.12
GPC traces and
1
H NMR spectra of ABDA and MAEDA polymers
(PABDA and PMAEDA) prepared by ATRP. Reproduced with permission from
Y. Zheng, K. Yao, J.S. Lee, D. Chandler, J. Wang, C. Wang; F. Chu and C. Tang,
Macromolecules
, 2010,
43
, 14, 5922. ©2010 American Chemical Society [5]
4.4.3 Properties of Resin Acid-derived Acrylic Polymers Prepared by
Atom Transfer Radical Polymerisation
The thermal properties of these polymers were characterised with the aid of differential
scanning calorimetry (DSC) (
Figure 4.13
). All acrylic polymers exhibited typical
thermoplastic behaviours. Thermal properties (e.g., glass transition temperature (
T
g
))
of the resulting polymers can be finely tuned through the change of the spacers between
the vinyl group and the hydrophenanthrene group. Acrylate polymers with the longest
spacers between the side group and the backbone (PABDA) showed the lowest
T
g
approximately 22
o
C) while the highest
T
g
(approximately 90
o
C) was observed from
the methacrylate polymer (PMAEDA). This indicated that the spacer can adjust the
rotation barriers of the polymer backbone. Thermogravimetric analysis (TGA) (
Figure
4.13
) showed that these polymers have two stages of weight loss behaviour: a slight
weight loss with onsets at approximately 220
o
C and a complete decomposition with
onsets at approximately 325
o
C, similar to many polymers derived from petroleum
chemicals such as polystyrene (PS) and polymethyl methacrylate.
