Rapid Stereocomplexation between Enantiomeric Comb-Shaped Cellulose-g-poly(l-lactide) Nanohybrids and Poly(d-lactide) from the Melt

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• 作者：Piming Ma ; Long Jiang ; Pengwu Xu ; Weifu Dong ; Mingqing Chen ; Piet J. Lemstra
• 刊名：Biomacromolecules
• 出版年：2015
• 出版时间：November 9, 2015
• 年：2015
• 卷：16
• 期：11
• 页码：3723-3729
• 全文大小：603K
• ISSN：1526-4602

文摘

In this work we report the in situ preparation of fully biobased stereocomplex poly(lactide) (SC-PLA) nanocomposites grafted onto nanocrystalline cellulose (NCC). The stereocomplexation rate by compounding high-molar-mass poly(mallcaps">d-lactide) (PDLA) with comb-like NCC grafted poly(mallcaps">l-lactide) is rather high in comparison with mixtures of PDLA and PLLA. The rapid stereocomplexation was evidenced by a high stereocomplexation temperature (T_c-sc = 145 掳C) and a high SC crystallinity (X_c-sc = 38%) upon fast cooling (50 掳C/min) from the melt (250 掳C for 2 min), which are higher than currently reported values. Moreover, the half-life crystallization time (175鈥?90 掳C) of the SC-PLA was shortened by 84鈥?2% in comparison with the PDLA/PLLA blends. The high(er) stereocomplexation rate and the melt stability of the SC in the nanocomposites were ascribed to the nucleation effect of the chemically bonded NCC and the 鈥渕emory effect鈥?of molecular pairs in the stereocomplex melt because of the confined freedom of the grafted PLLA chains.