Page 330 - Biodegradable Polyesters

308 12 Biodegradable Polyesters Polymer–Polymer Composites

reported

( ∘ C) [34] Amorphous [35] [38]
T m 177 Not 145 180 60 113

reported [34]

( ∘ C) 55–60 [34] [35] [37]
T g 2 Not −1 50 −60 −60

Elongation at break (%) 31] [30, 5–6 [32] 1000 50 — [33] 9 [35] 500 [37] 15

Time to degrade completely in the body 24–30 mo [31] reported Not reported Not 2 yr reported Not [36] >30 mo reported Not
Comparison of thermal and mechanical properties of various biodegradable polymers.

modulus (GPa) [31] [32] reported [33] [33] [35] [37]

Tensile 3.5 0.7 Not 3.2–3.7 0.9 0.4 0.7

strength (MPa) 31] [30, [32] [33] [33] [35] [37]

Tensile 40–43 50 20 55–60 41 21 35

for matter, corn for matter, corn

Source Naturally occurring Naturally occurring Naturally occurring Plant example, Plant example, Petro-chemical Petro-chemical

Table 12.3 Polymer Poly(3- hydroxybutyrate) Poly(4- hydroxybutyrate) Poly(hydroxybutyrate- co-hydroxyvalerate) PLLA Poly(L-lactic acid-co-D-lactic L:D (50 : 50 acid) ratio) Poly(ε-caprolactone) Poly(butylene succinate)