Preparation, Mechanical, and Thermal Properties of Biodegradable Polyesters/Poly(Lactic Acid) Blends

Table 2

Composition and thermal characteristics of the samples.

Sample	PLA/PBAT^a(wt%)	𝑇^𝑏𝑔(^∘C)	𝑇^𝑏𝑐(^∘C)	𝑇^𝑏𝑚(^∘C)	Δ𝐻^𝑏𝑐(Jg^-1)	Δ𝐻^𝑏𝑚(Jg^−1)	𝑋^𝑐𝑐 (%)
PLA	100/0	58.36	124.70	148.64	10.337	11.00	12.76
PBAT5	95/5	58.40	122.65	149.46	11.28	13.12	13.92
PBAT10	90/10	58.27	116.19	149.79	11.83	15.10	14.61
PBAT15	85/15	58.07	120.73	151.39	14.42	18.67	17.80
PBAT20	80/20	58.60	110.02	147.59	12.09	17.36	14.93
PBAT25	75/25	58.00	111.88	147.39	10.24	16.74	12.64

^aWeight ratio of the blends.
^bThe glass transition temperatures (𝑇_𝑔), the crystallization temperatures (𝑇_𝑐), the melting temperatures (𝑇_𝑚), crystallization enthalpies (Δ𝐻_c), melting enthalpies (Δ𝐻_𝑚) were registered by DSC at a heating/cooling rate of 10 ^∘C/min.
^cThe degree of relative crystallinity (𝑋_𝑐) was calculated by dividing the observed Δ𝐻_𝑚 from the first heating trace by the theoretical value (81 Jg⁻¹) for a 100% crystalline PLA. 𝑋_𝑐 =Δ𝐻_𝑐/Δ𝐻^∗𝑐Δ𝐻^∗𝑐=81J⋅g⁻¹.