Page 143 - Biodegradable Polyesters

5.4 Crystal Growth Rate 121

Isothermal data
Spherulite growth rate (μm min –1 ) 10 8 6 4 2 non-isothermal data

0

70 90 110 130 150 170
Crystallization temperature (°C)
Figure 5.11 Spherulite growth rates of PLA measured in isothermal and nonisothermal
conditions. Adapted from Ref. [73], Copyright (2005), with permission from Elsevier.

10 2 110 °C
Spherulite growth rate (μm min –1 ) 10 1 0

10
0
(°C)
n
m
15.4
174.2
10 –1 M (kDa) T g 48.0 T (°C)
185.0
55.9
40.7
118.3 59.1 192.4
218.6 59.7 197.6
80 100 120 140 160
Crystallization temperature (°C)
Figure 5.12 Spherulite growth rate of PLA melting points of the analyzed grades are
of different molar mass as a function of the indicatedinthe table. Adaptedwithpermis-
crystallization temperature. The glass tran- sion from Ref. [28], Copyright (2007) Ameri-
sition temperatures and the equilibrium can Chemical Society.