Thermal Behavior and Crystal Structure of Poly(l-lactic acid) with 1,3:2,4-Dibenzylidene-d-sorbitol

doi:10.1021/jp2037312

淡江大學機構典藏 > 工學院 > 化學工程與材料工程學系暨研究所 > 期刊論文 > Item 987654321/73555

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題名:	Thermal Behavior and Crystal Structure of Poly(l-lactic acid) with 1,3:2,4-Dibenzylidene-d-sorbitol
作者:	Lai, Wei-Chi
貢獻者:	淡江大學化學工程與材料工程學系
日期:	2011
上傳時間:	2011-11-15 15:22:07 (UTC+8)
出版者:	Washington: American Chemical Society
摘要:	This study investigated the effect of 1,3:2,4-dibenzylidene-d-sorbitol (DBS) on the thermal behavior and crystal structure of poly(l-lactic acid) (PLLA) by differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD). Different PLLA crystal structures (α- or α′-form crystal) were found by the change of the DBS amount and PLLA crystallization temperature. The order and regular α-form of PLLA was favored as the DBS component was added. The α-form crystal formed more at lower temperatures. Therefore, the disorder-to-order (α′-to-α) phase-transition temperature of PLLA was found to shift at lower temperatures as more DBS content was added. In the proposed structure of PLLA with DBS, the DBS molecules are stacked together through π–π interaction to form a strand with the PLLA molecules by hydrogen bonding. Because of these interactions, PLLA could have a more regular structure with the addition of DBS. In addition, the equilibrium melting point and glass-transition temperature of PLLA were not significantly changed with the addition of DBS. However, the addition of DBS changed the crystal structure of PLLA and thus affected the crystallization rate of PLLA.
關聯:	The Journal of Physical Chemistry B 115(38), pp.11029–11037
DOI:	10.1021/jp2037312
顯示於類別:	[化學工程與材料工程學系暨研究所] 期刊論文

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