Table 2.
Nonisothermal crystallization parameters as a function of cooling rate for polypropylene with unmodified and acetylated bamboo fibers.
Cooling Rate (°C/min) |
BPCs | To (°C ) | Tp (°C ) | Xc (%) | t1/2 (min) |
---|---|---|---|---|---|
2.5 | BPC0 | 127.2 ± 0.0 a | 124.3 ± 0.1 a | 67 ± 8 a | 2.31 ± 0.23 b |
BPC2 | 127.2 ± 0.2 a | 123.1 ± 0.7 a | 56 ± 15 a | 2.81 ± 0.11 ab | |
BPC6 | 126.0 ± 0.2 a | 122.5 ± 0.1 a | 67 ± 5 a | 2.91 ± 0.11 ab | |
BPC9 | 125.8 ± 0.0 ab | 122.4 ± 0.1 ab | 64 ± 9 a | 2.71 ± 0.16 ab | |
BPC13 | 125.6 ± 0.3 ab | 122.5 ± 0.3 ab | 64 ± 4 a | 2.63 ± 0.16 ab | |
BPC19 | 124.3 ± 0.1 b | 120.8 ± 0.2 b | 60 ± 11 a | 3.17 ± 0.34 a | |
5 | BPC0 | 126.5 ± 1.7 a | 122.4 ± 1.4 a | 63 ± 9 a | 1.57 ± 0.10 ab |
BPC2 | 125.9 ± 1.2 a | 121.7 ± 1.2 a | 53 ± 8 a | 1.61 ± 0.02 a | |
BPC6 | 124.6 ± 1.1 a | 120.3 ± 1.0 a | 67 ± 3 a | 1.57 ± 0.04 a | |
BPC9 | 123.8 ± 0.6 ab | 119.9 ± 0.4 ab | 59 ± 9 a | 1.41 ± 0.02 b | |
BPC13 | 123.7 ± 0.8 ab | 120.0 ± 0.7 ab | 57 ± 2 a | 1.39 ± 0.01 b | |
BPC19 | 121.5 ± 0.2 b | 117.6 ± 0.2 b | 60 ± 5 a | 1.57 ± 0.05 ab | |
10 | BPC0 | 122.1 ± 0.5 a | 117.6 ± 0.7 a | 64 ± 10 a | 0.82 ± 0.01 a |
BPC2 | 122.4 ± 0.4 a | 117.4 ± 0.4 a | 66 ± 9 a | 0.91 ± 0.01 a | |
BPC6 | 122.1 ± 0.8 a | 116.9 ± 0.7 a | 62 ± 8 a | 0.90 ± 0.02 a | |
BPC9 | 120.7 ± 0.9 a | 116.0 ± 0.7 a | 63 ± 6 a | 0.81 ± 0.06 a | |
BPC13 | 120.9 ± 0.3 a | 116.5 ± 0.4 a | 64 ± 9 a | 0.84 ± 0.09 a | |
BPC19 | 118.1 ± 0.2 b | 113.7 ± 0.3 b | 60 ± 5 a | 0.96 ± 0.04 a | |
15 | BPC0 | 121.9 ± 1.7 a | 116.2 ± 1.3 a | 70 ± 7 a | 0.65 ± 0.03 a |
BPC2 | 120.3 ± 0.1 ab | 115.1 ± 0.2 ab | 45 ± 18 a | 0.58 ± 0.05 a | |
BPC6 | 119.5 ± 1.0 ab | 113.3 ± 0.8 bc | 57 ± 4 a | 0.66 ± 0.02 a | |
BPC9 | 118.4 ± 0.7 bc | 113.1 ± 0.8 bc | 59 ± 14 a | 0.63 ± 0.06 a | |
BPC13 | 118.3 ± 0.2 bc | 113.3 ± 0.1 bc | 57 ± 1 a | 0.58 ± 0.05 a | |
BPC19 | 115.8 ± 0.3 c | 111.1 ± 0.3 c | 49 ± 5 a | 0.60 ± 0.04 a | |
20 | BPC0 | 118.7 ± 0.5 a | 112.8 ± 0.9 a | 59 ± 3 a | 0.48 ± 0.04 a |
BPC2 | 118.3 ± 0.4 ab | 111.9 ± 0.9 a | 60 ± 3 a | 0.53 ± 0.04 a | |
BPC6 | 118.1 ± 0.3 ab | 111.4 ± 0.2 ab | 61 ± 7 a | 0.53 ± 0.02 a | |
BPC9 | 116.7 ± 0.6 ab | 111.2 ± 0.6 ab | 56 ± 5 a | 0.47 ± 0.04 a | |
BPC13 | 116.6 ± 0.4 b | 111.0 ± 0.3 ab | 59 ± 12 a | 0.46 ± 0.01 a | |
BPC19 | 114.0 ± 0.3 c | 108.9 ± 0.8 b | 50 ± 14 a | 0.48 ± 0.03 a | |
25 | BPC0 | 117.3 ± 0.3 a | 111.0 ± 0.5 a | 69 ± 10 a | 0.41 ± 0.01 a |
BPC2 | 117.5 ± 0.6 a | 110.8 ± 0.5 a | 56 ± 9 a | 0.42 ± 0.00 a | |
BPC6 | 116.6 ± 1.8 a | 109.9 ± 1.6 ab | 62 ± 6 a | 0.44 ± 0.03 a | |
BPC9 | 115.4 ± 0.2 a | 109.6 ± 0.2 a | 51 ± 18 a | 0.38 ± 0.05 a | |
BPC13 | 115.5 ± 0.2 a | 109.6 ± 0.3 a | 64 ± 1 a | 0.39 ± 0.01 a | |
BPC19 | 112.5 ± 0.3 b | 107.3 ± 0.3 b | 56 ± 1 a | 0.38 ± 0.01 a |
Values are the mean ± SD (n = 3). Different superscript letters (a, b, and c) within a given cooling rate indicate a significant difference (p < 0.05).