Glass transition temperature obtained after Ln2 quenching studies for PTT and its blend
compositions.
Compositio
n
Tg(ºC)
LN2
quenched
(10ºCmin-1)
Tg(ºC)
LN2
quenched
(1ºC min-
1)
Tg(ºC)
LN2
quenched
(2ºC min-
1)
Tg(ºC)
LN2
quenched
(3º min-1)
Tg(ºC)
LN2
quenche
d
(4ºCmin-
1)100/0 44.79 39.87 40.59 41.94 42.0290/10 44.91 40.92 41.85 42.45 43.1480/20 45.15 41.29 41.38 42.14 42.6870/30 44.66 40.63 41.45 42.51 42.8960/40 44.65 41.29 42.61 42.48 42.790/100 88.84
Cold crystallization curves obtained at heating rate of 20ºC/min after heating and allowing to
cool in DSC. The peak temperature shifted from 75.56ºC for PTT to 74.40ºC for the 60/40
composition.
1
Avrami plots of Fig 4.(c) depicting the full conversion range.
2
0
1
2
3
4
5
6
175 180 185 190 195 200 205
k/m
in-n
Isothermal temperature/ºC
100 90/10 80/2070/30 60/40
2
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
175 180 185 190 195 200 205
n
Isothermal temperature/ºC
100/0 90/1080/20 70/3060/40
(a) (b)
0
1
2
3
4
5
6
175 180 185 190 195 200 205
t 0.1
/min
Isothermal temperature/ºC
100/0 90/10 80/20
70/30 60/40
0
2
4
6
8
10
12
175 180 185 190 195 200 205
t 0.5
/min
Isothermal temperature/ºC
100/0 90/10 80/20
70/30 60/40
(c) (d)
0
5
10
15
20
25
30
175 180 185 190 195 200 205
Δw/m
in
Isothermal temperature/ºC
100/0 90/10 80/20
70/30 60/40
(e)
Variation of (a) Avrami rate constant (k) (b) exponent (n), (c) induction time(t0.1), (d)half
time, (t0.5) and (e) peak width (Δw) with Tc for PTT and its blends.
3
-70
-60
-50
-40
-30
-20
-10
0175 180 185 190 195 200 205
ΔHc/J
g-1
Isothermal temperature/ºC
100/0 90/10 80/20
70/30 60/40
-70
-60
-50
-40
-30
-20
-10
0175 180 185 190 195 200 205
ΔHc(
nom
aliz
ed)/J
g-1
Isothermal temperature/ºC
100/0 90/1080/20 70/3060/40
(a) (b)
Variation of (a) enthalpy (ΔHc)and (b) normalized enthalpy ∆Hc(normalized) of crystallization
with Tc for PTT and its blends.
4
.
(a) (b)
(c) (d)
Melting behaviour of PTT and its blends in , (a) 90/10, (b) 80/20, (c) 70/30, and (d) 60/40
compositions after isothermal crystallization at different Tc.
5
180
190
200
210
220
230
240
250
260
270
280
180 200 220 240 260 280
Tm
/ºC
Tc /ºC
100/0 Tm=Tc
180
190
200
210
220
230
240
250
260
270
280
180 200 220 240 260 280
Tm
/ºC
Tc /ºC
90/10 Tm=Tc
(a) (b)
180
190
200
210
220
230
240
250
260
270
280
180 200 220 240 260 280
Tm
/ºC
Tc /ºC
80/20 Tm=Tc
150
170
190
210
230
250
270
290
150 175 200 225 250 275 300
Tm
/ºC
Tc /ºC
70/30
Tm=Tc
(c) (d)
180
190
200
210
220
230
240
250
260
270
280
180 200 220 240 260 280
Tm
/ºC
Tc /ºC
60/40 Tm=Tc
(e)
Hoffman Weeks Plot of PTT and its blends in (a)100/0, (b) 90/10, (c)80/20, (d) 70/30 and (e)
60/40 compositions.
6
Peak temperatures corresponding to melting of primary crystals
Tc/ºC 100/0 90/10 80/20 70/30 60/40peak I temperature /ºC
188 208.84 208.51 208.51 208.01 208.68190 209.7 209.7 209.53 209.87 209.7192 210.86 211.03 211.03 210.86 211.03194 212.35 212.35 212.18 212.35 212.52195 213.35 213.01 212.68 213.18 213.18196 214.18 213.34 213.68 213.51 213.84197 214.84 214.5 214 214.34 214.5198 216.03 214.87 214.53 214.7 215.03199 216.86 215.36 215.53 215.69 216.03200 216.53 216.19 215.69 216.03 216.53201 217.02 216.69 216.52 216.85 216.62
7