Journal
POLYMER DEGRADATION AND STABILITY
Volume 146, Issue -, Pages 113-120Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2017.10.002
Keywords
Poly(L-lactide); Poly(D-lactide); Nanocrystalline cellulose; Stereocomplex; Crystallization kinetics
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Funding
- Excellent Youth Natural Science Foundation of Jiangsu Province [BK20170053]
- National Natural Science Foundation of China [51573074]
- Fundamental Research Funds for the Central Universities [JUSRP51624A]
- Open Research Funds of Guangdong Key Laboratory of High Performance and Functional Polymer Materials [20160004]
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In this work, poly(L-lactide)/poly(D-lactide)/nanocrystalline cellulose (PLLA/PDLA/NCC) stereocomplex blends were prepared using a solution blending method. The effect of NCC on the crystallization kinetics of symmetric PLLA/PDLA blend was systematically investigated. The incorporation of NCC significantly enhanced the formation of stereocomplex crystal (sc), as indicated by increasing the crystallization peak temperature and crystallinity of sc from approx. 143 degrees C and 24% to around 160 degrees C and 40%, respectively, during the non-isothermal crystallizing upon cooling at 10 degrees C/min. Meanwhile, the addition of NCC caused no influence on the crystal morphology and crystal form of sc in the PLLA/PDLA blend, as evidenced by the POM and WAXD results. The crystallization kinetics of the PLLA/PDLA/NCC blends was studied in detail by using the Dobreva and Gutzow model, the Avrami-Jeziorny equation and the well-known Avrami model. It was found that NCC showed high nucleating activity in the PLLA/PDLA blend. The half-life time of crystallization of the PLLA/PDLA blend was decreased by ca. 78% at 180 degrees C after the addition of 0.5 wt% NCC. In addition, POM tests showed that the nuclei density in the PLLA/PDLA blend during isothermally crystallizing at 180 degrees C was largely increased by the addition of NCC.
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