Table 5. Thermal Properties of PGBS90 and PGBAT88 before and after Annealing.

	first heat					second heat	TGA
sample	Tcc/°C	ΔHcc/J g–1	Tm/°C	ΔHm/J g-1	Xca/%	Tg/°C	Td 5%/°C
PGBS90	98.6	2.2	141.0	5.5	1.8	16.8	271
PGBS90 AN			138.0	28.5	15.5	16.6
PGBAT88			131.8	1.4	0.7	15.1	280
PGBAT88	59.6	1.7	127.6	16.3	8.0	15.1

^aThe percentage of crystallinity was calculated using X_c = (ΔH_m – ΔH_cc)/ΔH_m°_PGA × 100%, where ΔH_m°_PGA = 183.2 J g^–1.³²