Response Surface Methodology for the Optimization of Preparation of Biocomposites Based on Poly(lactic acid) and Durian Peel Cellulose

Table 2

The arrangement of the central composite design.

Trial	Coded variables			Actual variables
				(%)	(°C)	(min)
1				25	165	15
2				25	165	25
3				25	175	15
4				25	175	25
5	+1			35	165	15
6	+1			35	165	25
7	+1			35	175	15
8	+1	+1	+1	35	175	25
9		0	0	21.6	170	20
10	+α	0	0	38.4	170	20
11	0		0	30	161.6	20
12	0	+α	0	30	178.4	20
13	0	0		30	170	11.6
14	0	0	+α	30	170	28.4
15	0	0	0	30	170	20
16	0	0	0	30	170	20
17	0	0	0	30	170	20
18	0	0	0	30	170	20
19	0	0	0	30	170	20
20	0	0	0	30	170	20