Journal
POLYMER
Volume 53, Issue 11, Pages 2306-2314Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2012.03.034
Keywords
Poly (L-lactic acid); Aliphatic amide; Nucleating efficiency
Categories
Funding
- National Funds for Distinguished Young Scientists [50925313]
- National Natural Science Foundation of China [11179031, 50873112]
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Two kinds of low molecular weight aliphatic amides, N, N'-ethylenebis (12-hydroxystearamide) (EBH) and N, N'-ethylenebisstearamide (EBSA), have been selected in present study to mediate the crystallization behavior of poly (L-lactic acid) (PLLA). The results showed that the crystallization rate of PLLA was significantly improved with the addition of EBH and EBSA, and EBH presented a stronger nucleating efficiency. The correlation between the variation of chain conformation during the early stages of isothermal crystallization and the enhancement of crystallization rate for pure PLLA and its mixtures was investigated by time-resolved FTIR. The formation of interchain conformational-ordered structure and intrachain 10(3) helix structure for amide-doped PLLA preceded that for pure PLLA, suggesting a stimulatory nucleating effect of EBH and EBSA. In the case of PLLA/EBH, the interchain interactions of -(COC + CH3) and -CH3 groups were faster than the -(CH3+CC) intrachain interactions, while the interchain interactions and the intrachain 10(3) helix formation were nearly synchronous for PLLA/EBSA. The hydrogen bond interaction between hydroxyl groups in EBH and the carbonyl groups in PLLA was proposed to be an important factor influencing the conformation variation during isothermal crystallization of PLLA. (C) 2012 Elsevier Ltd. All rights reserved.
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