Competitive Stereocomplexation and Homocrystallization Behaviors in the Poly(lactide) Blends of PLLA and PDLA-PEG-PDLA with Controlled Block Length
Abstract
:1. Introduction
2. Experimental Section
2.1. Materials and Reagents
2.2. Synthesis and Characterization of PDLA-PEG-PDLA
2.3. Preparation of PLLA/PDLA-PEG-PDLA Blends
2.4. Measurement of Blends
3. Results and Discussion
3.1. Effect of L/D Ratios on Stereocomplexation of PLLA/PDLA-PEG-PDLA Blends
3.2. Effect of PEG Block on Stereocomplexation of PLLA/PDLA-PEG-PDLA Blends
3.3. Effect of PDLA Block on Stereocomplexation of PLLA/PDLA-PEG-PDLA Blends
4. Conclusions
Supplementary Materials
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Code | Mthe a (×104 g/moL) | Mn b (×104 g/moL) | Mn c (×104 g/moL) | PDI c | Tc d (°C) | Tm d (°C) | Yield (wt %) |
---|---|---|---|---|---|---|---|
PDLA-PEG4k-PDLA50 | 1.12 | 1.48 | 1.40 | 1.56 | 108 | 165 | 73.0 |
PDLA-PEG4k-PDLA100 | 1.84 | 2.36 | 1.78 | 1.50 | 107 | 167 | 90.6 |
PDLA-PEG4k-PDLA200 | 3.28 | 2.93 | 2.11 | 1.61 | 105 | 169 | 67.4 |
PDLA-PEG4k-PDLA400 | 6.16 | 7.23 | 2.59 | 1.65 | 106 | 170 | 76.9 |
PDLA-PEG4k-PDLA600 | 9.04 | 9.62 | 3.41 | 1.51 | 106 | 172 | 57.4 |
PDLA-PEG0.4k-PLA100 | 1.48 | 2.07 | 1.47 | 1.40 | 102 | 170 | 93.4 |
PDLA-PEG1k-PDLA100 | 1.54 | 2.51 | 1.43 | 1.63 | 112 | 161 | 55.8 |
PDLA-PEG2k-PDLA100 | 1.64 | 2.91 | 1.57 | 1.57 | 105 | 171 | 92.4 |
PDLA-PEG6k-PDLA100 | 2.04 | 2.52 | 1.96 | 1.72 | 111 | 168 | 68.6 |
PDLA-PEG0.4k-PDLA400 | 5.80 | 6.20 | 2.53 | 1.71 | 105 | 172 | 86.0 |
PDLA-PEG1k-PDLA400 | 5.86 | 7.86 | 2.43 | 1.52 | 110 | 171 | 89.2 |
PDLA-PEG2k-PDLA400 | 5.96 | 7.10 | 2.34 | 1.47 | 109 | 170 | 88.2 |
PDLA-PEG6k-PDLA400 | 6.16 | 9.71 | 2.52 | 1.61 | 110 | 173 | 55.4 |
PEGX | PLLA/PDLA-PEGX-PDLA100 | PLLA/PDLA-PEGX-PDLA400 | ||||||
---|---|---|---|---|---|---|---|---|
n | k (min−n) | t1/2 (min) | G (um/min) | n | k (min−n) | t1/2 (min) | G (um/min) | |
0.4k | 2.50 | 4.26 × 10−3 | 7.83 | 5.00 | 3.65 | 1.29 × 10−3 | 7.64 | 7.85 |
1k | 2.61 | 4.83 × 10−4 | 1.76 | 9.98 | 2.49 | 1.03 × 10−3 | 6.17 | 7.73 |
2k | 2.80 | 1.81 × 10−3 | 8.37 | 8.57 | 3.15 | 1.43 × 10−3 | 7.22 | 16.10 |
4k | 3.13 | 2.39 × 10−3 | 5.36 | 5.36 | 2.08 | 1.56 × 10−2 | 13.77 | 8.93 |
6k | 2.81 | 3.79 × 10−3 | 7.69 | 5.00 | 3.09 | 1.34 × 10−3 | 5.66 | 8.34 |
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Jing, Z.; Shi, X.; Zhang, G. Competitive Stereocomplexation and Homocrystallization Behaviors in the Poly(lactide) Blends of PLLA and PDLA-PEG-PDLA with Controlled Block Length. Polymers 2017, 9, 107. https://doi.org/10.3390/polym9030107
Jing Z, Shi X, Zhang G. Competitive Stereocomplexation and Homocrystallization Behaviors in the Poly(lactide) Blends of PLLA and PDLA-PEG-PDLA with Controlled Block Length. Polymers. 2017; 9(3):107. https://doi.org/10.3390/polym9030107
Chicago/Turabian StyleJing, Zhanxin, Xuetao Shi, and Guangcheng Zhang. 2017. "Competitive Stereocomplexation and Homocrystallization Behaviors in the Poly(lactide) Blends of PLLA and PDLA-PEG-PDLA with Controlled Block Length" Polymers 9, no. 3: 107. https://doi.org/10.3390/polym9030107