Sample | Reaction time (h) | GY (μg/cm2) (mean ± SD) | [Br]/[C]j | [N]/[C]j |
|---|
Pristine PCLa | – | – | – | – |
PCL-NH
b2
| 1 | – | – | 0.043 |
PCL-GAc | 12 | – | – | – |
PCL-gelatind | 24 | 0.42 ± 0.11 | – | 0.097 |
PCL-Bre | 12 | – | 3.17 × 10−2 | – |
PCL-g-P(GMA)0f | 0.5 | 2.72 ± 0.68 | 2.34 × 10−2 | – |
PCL-g-P(GMA)1g | 1 | 6.31 ± 1.32 | 9.29 × 10−3 | – |
PCL-g-P(GMA)2h | 3 | 14.76 ± 2.63 | 4.72 × 10−3 | – |
PCL-g-P(GMA)0-c-gelatini | 24 | 0.93 ± 0.25 | – | |
PCL-g-P(GMA)1-c-gelatini | 24 | 2.63 ± 0.52 | – | 0.169 |
PCL-g-P(GMA)2-c-gelatini | 24 | 3.79 ± 0.73 | – | 0.202 |
- SD standard deviation
- aPristine PCL refers to the cleaned PCL film after rigorous washing with alcohol and deionized water
- bPCL-NH2 was obtained after 1 h of aminolysis in a 10 % (w/w) 1,6-hexanediamine/isopropanol mixture at 40 °C
- cPCL-GA was obtained after the PCL-NH2 surface immersed in a 2.5 wt% PBS solution of glutaradehyde (GA) at room temperature for 12 h
- dPCL-gelatin refers to the PCL-GA surface conjugated with gelatin after incubated in the PBS (pH 7.4) solution containing the gelatin at a concentration of 3 mg/ml at room temperature for 24 h
- ePCL-Br was obtained after the PCL-NH2 surface reacted with 2-bromoisobutyryl bromide (BIBB) in dried hexane containing 1:1 (molar ratio) BIBB and triehtylamine (TEA)
- f,gReaction conditions: [GMA]:[CuBr]:[CuBr2]:[bpy] = 100:1:0.2:2 in methanol/water solution (1:1, v:v) at room temperature for 1 and 3 h to produce the PCL-g-P(GMA)1 and PCL-g-P(GMA)2 surfaces, respectively
- hReaction conditions: the PCL-g-P(GMA)1 and PCL-g-P(GMA)2 surfaces incubated in the PBS (pH 7.4) solution containing the gelatin at a concentration of 3 mg/ml at room temperature for 24 h
- iGY denotes grafting yield, and is defined as GY = (W
a
− W
b
)/A, where W
a
and W
b
corresponds to the weight of the dry films before and after grafting, respectively, and A is the film area (about 3.2 cm2)
- jDetermined from their corresponding sensitivity factor-corrected element core-level spectral area ratios
