Table 1 Molecular characteristics and properties of two polymers
Sample
Mn(Â104)a
PDIa
Tg/1Cb
Td/1Cc
LCST1/1Cd
LCST2/1Ce
LCST3/1Cf
Liquid crystallinityg
P1
P2
8.40
7.75
2.26
2.63
53.8
23.8
388.3
386.9
—
65.0
—
52.0
88.0
47.5
Yes
Yes
a
b
The Mn and PDI of polymers were measured by GPC using PS standards and DMF as solvent. The glass transition temperatures were
obtained by DSC at a heating rate of 20 1C minÀ1 under N2 during the second heating process. The decomposition temperatures at 5% weight
c
loss of the samples measured by TGA heating experiments at a rate of 20 1C minÀ1 under N2. The polymers were dissolved in the highly pure
d
deionized water and then the aqueous solutions of polymers (2.0 mg mlÀ1) were measured by Laser Light Scattering. The aqueous solutions of
e
polymers (20.0 mg mlÀ1) were measured by Laser Light Scattering. The polymers P1 and P2 were dissolved in D2O, respectively, and then the
f
polymer solutions (20.0 mg mlÀ1) were measured by visual method. Liquid crystallinity was observed by polarized optical microscopy.
g
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for Science and Technology (NO.207075) and the New
Century Excellent Talents in University (NCET-05-0707).
We thank Dr Pingchuan Sun in Nankai University for his
help with the solid-state 13C-NMR measurements.
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ꢀc
This journal is The Royal Society of Chemistry 2010
Chem. Commun., 2010, 46, 3155–3157 | 3157